Updated on 2026/04/01

写真a

 
Ikushima Kazuki
 
Organization
Graduate School of Engineering Division of Aerospace and Marine-System Engineering Associate Professor
School of Engineering Department of Marine System Engineering
Title
Associate Professor
Affiliation
Institute of Engineering
Contact information
メールアドレス
Homepage
https://www.omu.ac.jp/eng/ikushima-lab/
Affiliation campus
Nakamozu Campus

Position

  • Graduate School of Engineering Division of Aerospace and Marine-System Engineering 

    Associate Professor  2022.04 - Now

  • School of Engineering Department of Marine System Engineering 

    Associate Professor  2022.04 - Now

Degree

  • Doctor (Engineering) （ Osaka Prefecture University ）

Research Areas

  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Marine engineering

Research subject summary

  • 非線形力学現象のモデル化

  • 構造物の効率的モデル化

  • 大規模非線形構造解析システムの開発

Professional Memberships

  • 溶接学会

    2009.01 - Now   Domestic

  • 日本船舶海洋工学会

    2007.06 - Now   Domestic

  • 日本機械学会

    2007.01 - Now   Domestic

Committee Memberships (off-campus)

  • 日本船舶海洋工学会   関西支部会務委員  

    2018.05 - Now 

  • 日本船舶海洋工学会   関西支部KSSG研究会幹事  

    2018.04 - Now 

  • 溶接学会   溶接構造研究委員会委嘱委員  

    2016.06 - Now 

Awards

  • 接合科学共同利用・共同研究賞

    2022.09   大阪大学接合科学研究所   溶接・接合技術におけるデジタルツインに関する研究

  • 軽金属溶接論文賞

    2022.06   軽金属溶接協会   摩擦攪拌接合時の力学的挙動の数値解析的検討

  • OMAE2016 Best Paper Award of Prof. Yukio Ueda Honoring Symposium

    2017.06   Ocean, Offshore, and Arctic Engineering Division, ASME  

  • 論文奨励賞

    2014.04   溶接学会  

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    Country：Japan

  • TECHNOVATION大賞

    2014.03   足立一馬基金  

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    Country：Japan

  • 優秀研究発表賞

    2013.12   溶接学会  

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    Country：Japan

  • 春季講演会ポスターセッション優秀賞

    2011.05   日本船舶海洋工学会  

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    Country：Japan

  • 奨学賞

    2011.02   溶接学会  

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    Country：Japan

  • TECHNOVATION奨励賞

    2011.02   足立一馬基金  

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    Country：Japan

  • 関西支部KFR、KSSG学生研究講演会構造部門最優秀賞

    2009.06   日本船舶海洋工学会  

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    Country：Japan

  • ポスターセッション優秀賞

    2009.05   日本船舶海洋工学会  

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    Country：Japan

  • 奨学褒賞

    2009.03   日本船舶海洋工学会  

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    Country：Japan

  • 秋季講演会ポスターセッション支部長賞(奨励)最優秀

    2008.11   日本船舶海洋工学会関西支部  

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    Country：Japan

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Papers

  • Quantification of Mechanical Factors in the Control of Weld Hot Cracking

    Wang W.

    Materials   19 ( 4 )   2026.02（ ISSN:1996-1944 ）

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  • Development of State Estimation Technology by Integrating Data Assimilation and Numerical Analysis

    Shibahara Masakazu, Ikushima Kazuki

    SYSTEMS, CONTROL AND INFORMATION   69 ( 8 )   288 - 293   2025.08（ ISSN:09161600 ） （ eISSN:24241806 ）

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  • Study on effect of water-cooling on thermal deformation during gas heating.

    HARADA Shigeta, MATSUOKA Ryo, NATSUME Ryohei, TEZEN Towa, TAMURA Kosuke, YAMAZAKI Yosuke, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   4 - 5   2025.03

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  • Study on Influence of Restraining Jigs on Welding Deformation in Multi-Pass Welding

    NAGAKI Hayato, YAMABE Mitsuru, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   12 - 13   2025.03

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  • Investigating the use of machine learning to create predictive models of weld deformation.

    SASAKI Syungo, WANG Wenda, NAKAGAWA Haruta, IKEUCHI Satoki, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   6 - 7   2025.03

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  • Study on Numerical Analysis for U-type Hot Cracking Test.

    WATANABE Kohei, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   42 - 43   2025.03

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  • Study on Digital Twin for U-type Hot Cracking Test.

    MAEDA Shintaro, WATANABE Kohei, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   44 - 45   2025.03

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  • Development of Machine Learning-based prediction of welding deformation

    NAKAGAWA Haruta, SASAKI Syungo, IKEUCHI Satoki, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   8 - 9   2025.03

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  • Development of Simplified Mechanical Model for Longitudinal Bending

    KUMADA Hiroyuki, WANG Wenda, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   10 - 11   2025.03

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  • Numerical Analysis of Mechanical Behavior During FSW Using Eulerian FEM for Solid Mechanics

    YOKOYAMA Akio, YAMAMOTO Kohei, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2025s ( 0 )   108 - 109   2025.03

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  • Study on influence of tool shape on stirring performance and wear during FSW using numerical simulation

    Ikushima K.

    Welding International   2025（ ISSN:09507116 ）

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  • Effect of heat input parameters on deformation during gas heating

    SHIBAHARA Masakazu, TAKAHASHI Riku, TEZEN Towa, MAEDA Shintaro, IKUSHIMA Kazuki

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   175 - 182   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    This study examines the deformation caused by gas heating. Gas heating is a technique used in shipbuilding and other industries for plate bending and the straightening of welding-induced distortions. To examine the influence of various parameters on deformation during gas heating, dimensional analysis and Thermo-elastic-plastic analysis using Idealized Explicit FEM were employed. As a result, six dimensionless parameters were derived, including heat input, heating speed relative to thermal conductivity, shape of heat source, heat transfer, and specimen geometry. The validity of these parameters was verified by comparing temperature distributions obtained through thermal conductivity analysis. This study revealed that the heat source shape parameter significantly affects both transverse shrinkage and angular distortion, especially in gas heating conditions where the heat input distribution is wider than its distribution in welding. The parameter of heating speed showed a more significant effect on angular distortion in gas heating compared to welding. It was found that transverse shrinkage in gas heating is strongly affected by the heat source shape parameter and heat distribution parameter. Furthermore, angular distortion could be effectively organized using the heat distribution parameter for both welding and gas heating conditions. These findings contribute to a better understanding and prediction of deformation in gas heating processes, enhancing accuracy and efficiency in construction of steel structures.

    DOI： 10.2207/qjjws.43.175

    CiNii Research

  • Digital Twin System for Estimation of Creep Damage in Welded Piping Joint Using Data Assimilation.

    YAMAUCHI Yuki, KITANI Yuji, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   151 - 161   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    With the increasing adoption of renewable energy, thermal power plants are expected to shift from baseload power sources to load-adjusting power sources. This change in operating environment may lead to temperature and strain variations during load fluctuations, including start-stop cycles, which can cause creep-fatigue damage in addition to creep damage due to internal pressure in large-diameter pipes of thermal power plants. As the damage mechanism may change with the operating conditions, it is crucial to develop a digital twin system that monitors temperature and strain during operation and estimates the remaining life of the components. In this study, we developed a system integrating data assimilation techniques with finite element method (FEM) to construct a digital twin for estimating the creep-fatigue life of high-temperature piping structures. We conducted numerical twin experiments using the developed system to estimate the state of a welded pipe structure subjected to internal pressure and bending loads, and verified the validity of the system. Additionally, we performed state estimation with measurement errors to demonstrate the robustness of the system against disturbances. When assuming errors in the measurement locations, the estimation errors increased compared to the case using simulated experimental data without errors. However, the system was able to estimate boundary conditions following the trend of the phenomenon. This trend was similar for both load estimation and creep-fatigue life estimation. When assuming errors in the measurement range, a similar trend was observed as in the case of measurement location errors, but with larger estimation errors. When random noise of up to 10% of the maximum strain was added to the pseudo-measurement data, the creep-fatigue life estimation was not significantly affected. However, when biased noise was added, the impact was relatively significant.

    DOI： 10.2207/qjjws.43.151

    CiNii Research

  • Study on Effect of Prevention of Hot Cracking Using Parallel Heating

    MAEDA Shintaro, MITSUI Yuta, WANG Wenda, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   231 - 238   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Hot cracking is one of the most serious welding defects that can significantly reduce the strength of structures, and it is important to prevent hot cracking. In the Japanese shipbuilding industry, one-sided submerged arc welding with multiple electrodes is used to improve the production efficiency of welding large steel plate joints for ships, and it has been reported that hot cracking may occur at the termination. From the viewpoint of the mechanism of hot cracking, if tensile strain does not act within the Brittleness Temperature Range (BTR), the possibility of cracking is negligible. In other words, any hot cracking problem can be solved if compressive strain can be applied within the BTR during welding.
    In this study, a new “parallel heating method” is proposed to prevent hot cracking by using the thermal expansion caused by simultaneous additional heating to the welding torch. In the analysis of bead-on-plate welding, the effect of the parallel heating method in reducing high-temperature strain and its appropriate conditions were investigated. It was confirmed that the proposed method reduced high-temperature strain not only at the steady state but also at the beginning and end of the weld. It was also confirmed that the effect of reducing high-temperature strain varies depending on the position of the additional torch, and that there is an appropriate heating position depending on the target weld. In the analysis of multi electrode single side submerged arc welding, it was confirmed that the proposed method has little effect on the weld penetration shape, and it was shown that the proposed method can ensure weldability. It was also confirmed that the proposed method has a significant reduction effect on high-temperature strain generated by localized opening deformation, demonstrating the usefulness of the proposed method.

    DOI： 10.2207/qjjws.43.231

    CiNii Research

  • Proposal and Its Application of Modified Thermal Shrinkage Technique

    WANG Wenda, TEZEN Towa, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   122 - 130   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    FEM thermal elastic-plastic analysis, which is commonly used to analyze welding deformation and residual stress, is known to be very time-consuming because it sequentially analyzes local melting and elastic-plastic phenomena of the material from the start of welding to complete cooling. In contrast, the thermal shrinkage technique, a simpler numerical method for predicting weld deformation, models only the thermal shrinkage that occurs during the cooling process of the weld and predicts the final welding deformation in a one-step elastic-plastic analysis. However, it has some issues, such as the fact that it can only be applied to angular distortion.
    Therefore, modified thermal shrinkage technique is proposed in this study, which can reproduce not only angular distortion but also other deformations in the analysis by setting multiple input parameters. The proposed method is applied to bead-on-plate welding, and it is confirmed that the shrinkage area and shrinkage temperature can be calculated to reproduce well all transverse shrinkage and angular distortion under multiple heat input conditions. Using the shrinkage area and shrinkage temperature calculated from bead-on-plate welding, the modified thermal shrinkage technique was applied to a multi-layer weld with six passes, and it was confirmed that modified thermal shrinkage technique could reproduce well the transverse shrinkage and angular distortion in all passes. In addition to these results, the computation time is more than 250 times faster than that of FEM thermal elastic-plastic analysis, demonstrating the usefulness of the modified thermal shrinkage technique.

    DOI： 10.2207/qjjws.43.122

    CiNii Research

  • Development and Application of Hot Cracking Analysis considering Metallurgical and Mechanical factors.

    MAEDA Shintaro, WANG Wenda, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   239 - 246   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Hot cracking is a phenomenon that occurs when the tensile strain acting on the liquid film is large within the Brittleness Temperature Range (hereinafter referred to as BTR), where solid and liquid coexist in the weld zone. Since the liquid phase has less strength than the solid phase, strain tends to be concentrated in the liquid phase. Therefore, in addition to considering the strength difference between the solid and liquid phases in the analysis, it is important to visualize the direction of crystal growth and the meeting angle to evaluate hot cracking. In addition, solidification shrinkage strain occurs during solidification of molten metal due to the density difference between the solid and liquid phases, and the effect of this strain cannot be ignored.
    Therefore, the authors have developed a weld hot cracking analysis method that can consider metallurgical factors such as solidification shrinkage strain and crystal growth direction, as well as mechanical factors such as strain, deformation and stress. In this study, the proposed method is applied to butt welds to investigate the effects of various factors on the high temperature strain. The effects of the bevel angle on the solidification morphology and the high-temperature strain of the weld zone were examined, and it was shown that hot cracking is more likely to occur in narrow bevel welds with small bevel angles. Furthermore, the effect of the relationship between temperature and solid fraction on the high-temperature strain of the weld zone during cooling was examined, and it was confirmed that the plastic strain increment in BTR was larger where the variation of solid fraction with temperature was large, and that the plastic strain increment in BTR was smaller where the variation of solidus ratio with temperature was small.

    DOI： 10.2207/qjjws.43.239

    CiNii Research

  • Technological Innovations in Thick Plate Bending of Large Ship Hull Forming

    SHIBAHARA Masakazu, KATO Takuya, TANGO Yoshihiko, MAEDA Shintaro, IKUSHIMA Kazuki

    PLASTOS   8 ( 95 )   641 - 645   2025（ eISSN:24338826 ）

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  • Proposal of Modeling in Simulation of Welding of Large Steel Structures and its Validation

    HASHIBA Daisuke, YANAGISAWA Yusuke, HONMA Yuta, YAMAUCHI Yuki, MAEDA Shintaro, KAWAHARA Atsushi, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   105 - 114   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Welding is widely used in the manufacture of steel structures, but weld deformations due to the heat input affects the strength of the structures. Therefore, it’s necessary to be straightened depending on circumstances. However, because straightening is a very costly process, numerical analysis is required to minimize weld deformations. Weld deformations can be simulated by nonlinear thermal elastic-plastic analysis based on the finite element method (FEM). Moreover, the idealized explicit FEM, which is capable of high-speed calculation, has been used to analyze real structures. However, the element sizes relative to the weld length becomes extremely fine when the heat source length of multi-pass welding problem for large steel structures is defined in actual dimensions, resulting in enormous calculation time even if the FEM is used. One way to counter this problem is to increase the heat source length. However, if the heat source length is excessive, analysis accuracy may be reduced due to excessive expansion or shrinkage in the heat input range. Thus, the effect of the heat source length on the analysis accuracy was examined in this study. In addition, the FEM was performed on the welded assembly of a hot dip galvanizing bath, which is one of the large steel structures, and the accuracy of the analysis was verified by comparing the analytical results with measured values. As a result, the maximum achievable temperature decreases with increasing heat source length and that weld deformation is underestimated. Therefore, it’s suggested that optimization of current density according to the length of heat source is necessary to achieve both accuracy of analysis and reduction of calculation time in the analysis of large steel structures.

    DOI： 10.2207/qjjws.43.105

    CiNii Research

  • Study on influence of tool shape on stirring performance and wear during FSW using numerical simulation.

    IKUSHIMA Kazuki, KUKI Masaharu, YAMAUCHI Yuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   162 - 174   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    This study investigates the influence of tool shape on stirring performance and wear in Friction Stir Welding (FSW) of steel materials using particle-based numerical simulation. Two tool shapes were examined: a conventional cylindrical probe and a spherical probe, which is expected to maintain equivalent joint quality while minimizing the stirring area and potentially extending tool life. The simulation method, based on particle dynamics, was employed to analyze material behavior during FSW and evaluate the effects of tool rotation speed and welding speed on stirring performance and tool wear for both tool shapes. Stirring performance was assessed by quantifying material dispersion in the welded joint, while tool wear was evaluated based on the adhesive wear theory. Results showed that stirring intensity was higher on the advancing side (AS) than the retreating side (RS) for both tool shapes, consistent with experimental observations from previous studies. The probe tip shape was found to significantly affect stirring performance. Increasing rotation speed enhanced stirring, while increasing welding speed reduced it. Tool wear was most pronounced during the initial plunge phase. During quasi-steady state, wear was greater on the RS of the tool where flow stress is lower, and at the tool edges where relative speed is high and hardness decreases due to temperature rise. The spherical tool exhibited less wear compared to the cylindrical tool across all tested conditions. The effects of welding parameters on tool wear aligned well with trends reported in literature, with higher rotation speeds increasing wear and higher welding speeds decreasing it. The spherical tool consistently demonstrated lower wear, particularly in the probe region, suggesting its potential as a longer-lasting alternative to conventional cylindrical tools in FSW of steel materials.

    DOI： 10.2207/qjjws.43.162

    CiNii Research

  • 構造物の動的問題の効率的解析手法の開発と応用

    佐々木 駿伍, 山内 悠暉, 池内 聡希, 神谷 浩武, 佐藤 寿恭, 生島 一樹, 柴原 正和

    Dynamics & Design Conference   2025 ( 0 )   4   2025（ eISSN:24242993 ）

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    <p>構造物の設計においては各周波数帯の変形の把握は重要であるが、大型構造物では動的解析の計算負荷が高く、予測技術の活用が難しいのが現状である。本研究では、動的解析に対して理想化陽解法をはじめとした効率的計算手法を導入した。汎用FEM解析ソフトと比較した結果、いずれの手法も汎用FEM解析ソフトとほぼ同等の解析精度を有し、かつ、100万要素モデルで最大20倍の高速化と約5倍の省メモリ化を実現できることが分かった。また、高速解析手法の活用として、デジタルツインへの応用も検討した。</p>

    DOI： 10.1299/jsmedmc.2025.4

    CiNii Research

  • Study on Weld Solidification Cracking Using Simplified Analysis of Solidification Growth of Columnar Crystals.

    MAEDA Shintaro, HABATA Masashi, WANG Wenda, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   222 - 230   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    It is known that the crystal structure within the molten pool affects the initiation and propagation of solidification cracking. Cracking can occur where crystals meet or where crystals are adjacent to each other. To evaluate cracking behavior more precisely, analysis that takes into account the crystal structure associated with melting and solidification is required.
    In this study, a simple method was developed to visualize the growth direction of columnar crystals during the solidification process of weld metal from the temperature distribution, temperature gradient and their histories in FEM heat conduction analysis. In addition, by determining the location of the liquid phase in the weld transient and reflecting it in FEM thermal-elastic-plastic analysis, a solidification cracking analysis that takes into account the crystal structure and the existence of the liquid phase between crystals was proposed.
    As a result, it was confirmed that the distribution of columnar crystals growing in the molten pool and the strain behavior acting on the liquid phase region between crystals during welding can be well visualized. The proposed method was applied to a two-dimensional analysis to investigate the effect of crystal size on the existence of liquid phase and the amount of strain generated in the liquid phase region, and it was confirmed that the plastic strain increment in BTR generated in the liquid phase region was larger under conditions with larger columnar crystal diameter. The effect of welding speed on crystal growth and strain behavior in the molten zone were investigated by three-dimensional analysis, and it was confirmed that the growth of columnar crystals similar to the actual phenomenon could be well represented by varying the welding speed. The strain behavior acting on the liquid phase region during welding transient was examined, and it was confirmed that large strain occurred at the low temperature side and expanded to the high temperature side.

    DOI： 10.2207/qjjws.43.222

    CiNii Research

  • Mechanical Study on Effect of Various Factors on Out-of-plane Deformation in Welding Reviewed

    MAEDA Shintaro, HABATA Masashi, TANAKA Ryoma, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   115 - 121   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    In large-scale construction, welding is indispensable but often leads to the deformations due to weld heat. These deformations can weaken joints, compromise structural integrity, reduce assembly efficiency, increase costs and affect the appearance. Predicting and controlling these deformations are important for maintaining the quality and safety of structures. However, predicting and controlling these deformations is difficult due to the influence of various factors such as heat input conditions, material properties and structural geometry.
    In particular, out-of-plane deformations often cause significant problems in the welding of large structures. This study investigates the impact of various heat input parameters and plate dimensions on out-of-plane deformations using thermal-elastic-plastic analysis with an Idealized explicit finite element method (FEM).
    As an index to evaluate the out-of-plane deformation, the inherent deformation calculated by integrating the inherent strain in the longitudinal and transverse directions was applied, and its validity was verified. Simplified predictions of out-of-plane displacement distribution based on inherent deformations were compared with detailed FEM results, demonstrating good agreement for simple plates. However, specific conditions with large heat input and long plates revealed reverse bending modes, indicating the limitations of inherent strain-based predictions. Therefore, this study categorized deformation modes into longitudinal bending-dominated, transverse bending-dominated and large deformation modes, examining and discussing how various parameters affect these deformation modes.
    It was found that larger heat input and longer or thinner plates likely to cause large deformation modes. These findings enhance the understanding of weld-induced deformation mechanisms and lead to the development of effective prediction and control strategies to mitigate these deformations in practical applications.

    DOI： 10.2207/qjjws.43.115

    CiNii Research

  • Mechanical Study on Hot Cracking in Welding End of Weathering Steel Deck Plate

    NAGAKI Hayato, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   213 - 221   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Submerged arc welding is often used in the construction of large steel structures such as bridges where weather-resistant steel materials are used because of its high welding efficiency. However, end cracking, which is solidification cracking, may occur at the weld termination. To prevent such cracking, a tab plate is attached to the weld termination to restrain the end of the base metal, but depending on the type of restraint method, end cracking may not be prevented.
    In this study, the effects of two types of restraint methods in the tab plate on the occurrence of termination cracking in one-pass submerged arc welding were investigated from both experimental and analysis points of view. Experimental results showed that cracking occurred in the cascade restraint method with a large restraint in the groove, which was initially considered to have a low risk of end cracking. However, simple restraints with small restraint in the groove did not cause end cracking. After confirming that the temperature history, penetration shape, and transverse shrinkage agreed well with the experimental results, hot cracking analysis was used to evaluate end cracking, and it was confirmed that the analysis could reproduce well the trend of cracking risk and the location of cracking that occurred at the weld termination for different restraint methods. In addition, by comparing the amount of bevel shrinkage at the weld termination during cooling, it was confirmed that the amount of bevel shrinkage of specimen B, in which the restraint in the bevel is large, is smaller than that of specimen A, in which the restraint in the bevel is small.

    DOI： 10.2207/qjjws.43.213

    CiNii Research

  • Study on Estimation of Heat Distribution during Gas Heating by Inverse Analysis.

    SHIBAHARA Masakazu, MATSUOKA Ryo, MINEMATSU Nobuyuki, MAEDA Shintaro, KAWAHARA Atsushi, IKUSHIMA Kazuki

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   183 - 190   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    This study focuses on the development of a Digital Twin system for predicting thermal-elastic-plastic fields during gas heating processes. In large-scale structures, assembly welding often induces out-of-plane deformations, requiring skilled workers to apply corrective heating. Considering the decreasing number of skilled workers, it is crucial to automate these processes. A Digital Twin system that integrates FEM analysis with temperature and displacement measurements is proposed to accurately predict and optimize gas heating conditions. This system estimates unknown parameters such as heat distribution and temperature-dependent yield stress, achieving high accuracy in replicating actual phenomena. Using SS400 material, we conducted gas heating experiments to validate our system's effectiveness. Results showed that our system accurately reproduced experimental temperature and displacement fields. Moreover, the system identified optimal heating conditions that minimized deformation to within ±1 mm, demonstrating its potential for practical applications in the fabrication of complex structures. This Digital Twin approach represents a significant advancement in automating the gas heating process, reducing dependency on skilled workers, and contributing to precise deformation control.

    DOI： 10.2207/qjjws.43.183

    CiNii Research

  • Development of Digital Twin System for Integrity Assessment of Welded Joints in Piping Structures

    YAMAUCHI Yuki, MATSUOKA Ryo, KITANI Yuji, IKUSHIMA Kazuki, ARAI Masayuki, NISHIDA Hidetaka, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   142 - 150   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    The heat-affected zone (HAZ) formed during the welding of power plant piping is known to be susceptible to fracture caused by creep damage at high temperatures. In recent years, power plants are expected to experience larger load fluctuations due to the introduction of clean energy, and there is a growing demand for monitoring technologies for creep-fatigue in piping. When monitoring, it is crucial to understand the stress state acting on the piping from relatively easily obtainable data such as displacement and temperature. In this study, we developed a digital twin system that integrates FEM analysis with time-series deformation data to estimate the creep deformation behavior of welded joints in piping structures and evaluate their integrity. The system is capable of simultaneously estimating material constants representing the variability of welded joints, as well as load and boundary conditions. We applied this system to estimate the mechanical state during creep-fatigue testing of high-temperature steel pipes. First, we verified the validity of the proposed method. The results showed that the method accurately reproduced the experimentally applied load in both cases: when estimating only the load and when simultaneously estimating the load and creep coefficient. Additionally, we investigated the convergence of the proposed method and found that estimated load converged to values close to the experimentally applied load for different initial values. These findings confirm that the proposed method is a useful digital twin system for evaluating the integrity of welded joints in piping structures.

    DOI： 10.2207/qjjws.43.142

    CiNii Research

  • Study on Mechanization and Automation of Ship Hull Forming Using FEM and AI.

    KATO Takuya, IKUSHIMA Kazuki, TANGO Yoshihiko, NOTSU Akira, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   202 - 212   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Publishing type：Research paper (scientific journal)  

    In this study, the mechanization and automation of ship hull surface shaping were aimed by integrating finite element method (FEM) with artificial intelligence (AI) technologies. In the bending process of thick plates, such as those used in shipbuilding, localized heating and cooling with gas burners and cooling water are employed to form arbitrary curved steel plates. Traditionally, the process of shaping complex ship hull surfaces, especially at the bow and stern, relied on skilled workers. A system was developed that combines FEM analysis and AI technologies, particularly Bayesian optimization, to accurately simulate thermal deformation and mechanically calculate the optimal heating plan. Experimental tests were conducted using this system along with a specially developed small robot. However, a difference was identified between the analytical space and the actual space, and despite being able to create the target shape in the analytical space, various factors in the actual space prevented the desired shape from being achieved by following the calculated heating plan. Therefore, methods to reduce the gap between analytical and actual spaces were introduced in this study, allowing surfaces that closely match the target shapes to be achieved in shipyard testing.

    DOI： 10.2207/qjjws.43.202

    CiNii Research

  • Development of AI Line Heating System and Its Application to Automatic Production of Arbitrary Shaped Steel Plate.

    KATO Takuya, HIROSE Sora, MAEDA Shintaro, IKUSHIMA Kazuki, TANGO Yoshihiko, NOTSU Akira, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   43 ( 2 )   191 - 201   2025（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Publishing type：Research paper (scientific journal)  

    In this study, an AI-based line heating system is proposed for automating the production of arbitrarily shaped steel plates for shipbuilding applications. Line heating is a bending fabrication technique that uses gas burners and cooling water to locally heat and cool the plate to form arbitrary curved surfaces. Traditionally, the process of plate forming with complex curvatures, especially at the bow and stern of ships, has heavily relied on skilled workers using line heating technology. The proposed AI line heating system utilizes finite element method (FEM) and artificial intelligence to calculate the heating plan required to achieve the desired shape. The system involves two algorithms. The first algorithm calculates the bending scheme by approximating the target shape with discrete heating lines based on the principal curvature directions. The second algorithm uses Bayesian optimization and FE analysis to calculate a heating plan that is used to shrink the steel plate in-plane, thereby forming complex non-developable surfaces. Additionally, this system can calculate a heating plan to minimize the amount of heating work required for any shape and thickness of the plate. It was also demonstrated that using curvature as a measure of shape evaluation allows for the calculation of heating plan that forms highly accurate final curved surfaces. This study suggests that the AI line heating system can replace skilled workers with robotics in forming hull surfaces, capable of generating a heating plan for any shape and thickness.

    DOI： 10.2207/qjjws.43.191

    CiNii Research

  • Creep-fatigue life prediction of a welded pipe structure under complex bending-torsion loading

    Shibahara M.

    Welding in the World   2025（ ISSN:00432288 ）

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  • Proposal and its application of modified thermal shrinkage technique

    Wang W.

    Welding International   2025（ ISSN:09507116 ）

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  • Study on effect of prevention of hot cracking using parallel heating

    Maeda S.

    Welding International   2025（ ISSN:09507116 ）

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  • 2024A-GS2-4 Study on Influence of Welding Deformation and Residual Stress on Collapse Behavior of Stiffened Panel

    Maeda Shintaro, Tatsumi Akira, Komoriyama Yusuke, Yamauchi Yuki, Shibahara Masakazu, Ikushima Kazuki

    Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers   39 ( 0 )   745 - 749   2024.11（ eISSN:24241628 ）

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  • AI-based automation of ship hull forming using AI line heating system

    T. Kato, Y. Tango, A. Notsu, K. Ikushima, M. Shibahara

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures   pp.565 - 569   2024.09

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    Kind of work：Joint Work  

  • Shell-solid mixed analysis for efficient modeling of mechanical behavior in thin-plaste complex structure during joining

    Y. Yamauchi, S. Maeda, K. Ikushima, M. Shibahara

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures   pp.558 - 564   2024.09

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    Kind of work：Joint Work  

  • AI-based automation of ship hull forming using AI line heating system

    T. Kato, Y. Tango, A. Notsu, K. Ikushima, M. Shibahara

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures   pp.565 - 569   2024.09

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    Kind of work：Joint Work  

  • Shell-solid mixed analysis for efficient modeling of mechanical behavior in thin-plaste complex structure during joining

    Y. Yamauchi, S. Maeda, K. Ikushima, M. Shibahara

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures   pp.558 - 564   2024.09

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    Kind of work：Joint Work  

  • Development of Digital Twin for Thermal Processes with Temperature and Displacement Fields.

    YAMABE Mitsuru, MATSUOKA Ryo, MAEDA Shintaro, KAWAHARA Atsushi, NATSUME Ryohei, TAMURA Kosuke, YAMAZAKI Yosuke, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024s ( 0 )   152 - 153   2024.03

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  • Development of Simulation of Friction Stir Welding based on Eulerian Solution.

    SHIKATA Kota, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024s ( 0 )   52 - 53   2024.03

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  • Study on Influence of Various Factors on Out-of-plane Deformation during Welding of Aluminum Alloy

    ICHIKAWA Ryota, HABATA Masashi, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024s ( 0 )   150 - 151   2024.03

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  • Prediction of Welding Deformation by Using Modified Thermal Shrinkage Technique.

    WANG Wenda, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024s ( 0 )   156 - 157   2024.03

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  • Straightening Simulation of Welding Deformation by Line Heating for Large Steel

    HASHIBA Daisuke, GOTO Yoshihiro, YANAGISAWA Yusuke, TANABE Yoshimitsu, HONMA Yuta, YAMAUCHI Yuki, KAWAHARA Atsushi, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024s ( 0 )   154 - 155   2024.03

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  • Solidification cracking analysis considering residual liquid film around molten pool.

    MAEDA Shintaro, TEZEN Towa, WANG Wenda, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024s ( 0 )   104 - 105   2024.03

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  • Shell-solid mixedanalysis for efficient modeling of mechanical behavior in thin-plate complex structures during joining

    前田 新太郎, 生島 一樹, 柴原 正和

    The 37th Asian-Pacific Technical Exchnage and Advisory Meeting on Marine Structures, (TEAM 2024)   1   558 - 564   2024

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  • Rapid Prediction of Deformation and Stress in Transient Phenomena during Welding Using AI-Based FEM Thermal Elastic Plastic Analysis

    KATO Takuya, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   234 - 235   2024

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  • Creep fatigue life prediction of pipe joints under complex bending-torsional loading using large-scale nonlinear structural analysis

    Y. Kitani, K. Ikushima, M. Arai, H. Nishida, N. Ma, M. Shibahara

    Welding International   38 ( 11 )   792 - 804   2024（ ISSN:09507116 ）

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  • Gas heating analysis considering gas flame temperature and heat transfer.

    MATSUOKA Ryo, MAEDA Shintaro, NATSUME Ryohei, TAMURA Kosuke, YAMAZAKI Yosuke, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   222 - 223   2024

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  • FSW Simulation Using Eulerian FEM for Solid Mechanics with Marker Particles

    YAMAMOTO Kohei, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   114 - 115   2024

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  • Investigation of Thermal Deformation in Metal 3D Printing by Using Elastic analysis based on Inherent Strain．

    HABATA Masashi, SASAKI Shungo, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   432 - 433   2024

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  • Development of Simplified Mechanical Model for Multi-pass Welding

    WANG Wenda, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   244 - 245   2024

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  • Study for Faster Analysis of Weld Deformation during Multi-Layer Welding of Large-Scale Steel Structures.

    NAGAKI Hayato, YAMABE Mitsuru, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   246 - 247   2024

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  • Creep fatigue life prediction of pipe joints under complex bending-torsional loading using large-scale nonlinear structural analysis

    KITANI Yuji, IKUSHIMA Kazuki, ARAI Masayuki, NISHIDA Hidetaka, MA Ninshu, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   42 ( 2 )   78 - 88   2024（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Publishing type：Research paper (scientific journal)  

    With the expansion of clean energy, thermal power plants will be used as a load-following power plant. Thus, temperature and strain variations will occur during load fluctuations including start and stop of operation, and large-diameter pipes will be damaged by fatigue in addition to creep due to internal pressure. Especially, in a bent pipe such as an elbow pipe, bending and torsion are simultaneously applied. Therefore, it is important to predict the creep fatigue life in a bending and torsional stress environment. In this study, analysis method for creep fatigue life using Norton's law, ductile exhaustion law, and Manson-Coffin's law is proposed. Next, the proposed method was applied to the prediction of creep fatigue life of the test samples for thermal power plant piping, and the validity of the proposed method was verified by comparing creep fatigue life obtained by proposed method and that obtained by an experiment. In addition, the proposed method is applied to the prediction of creep fatigue life with load fluctuations and investigation of the effects of load fluctuation interval on creep fatigue life.

    DOI： 10.2207/qjjws.42.78

    CiNii Research

  • Welding Deformation and Residual Stress

    SHIBAHARA Masakazu, IKUSHIMA Kazuki

    JOURNAL OF THE JAPAN WELDING SOCIETY   93 ( 6 )   380 - 390   2024（ ISSN:00214787 ） （ eISSN:18837204 ）

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  • Effect of Multi-pass Heating on Deformation in Line Heating.

    HIROSE Sora, YAMAMOTO Kohei, KATO Takuya, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   238 - 239   2024

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  • Study on Welding Sequence to Reduce Welding Deformation using Genetic Algorithm.

    MAEDA Shintaro, NISHIHARA Kensaku, NAKAMURA Takahito, NAGAI Takuya, OKABE Toshiaki, TAKEDA Hiroyuki, KAWAHARA Atsushi, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   242 - 243   2024

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  • Study on Effect of Various Factors on Mechanical Behavior Under Metal Additive Manufacturing.

    SASAKI Shungo, WANG Wenda, TEZEN Towa, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2024f ( 0 )   430 - 431   2024

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  • Development of Computational Welding Mechanics Analysis Method Based on the Idealized Explicit FEM and its Application

    IKUSHIMA Kazuki

    JOURNAL OF THE JAPAN WELDING SOCIETY   93 ( 3 )   159 - 165   2024（ ISSN:00214787 ） （ eISSN:18837204 ）

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  • Effect of Transformation Plasticity Behavior on the Accuracy of Weld Residual Stress Analysis of Low Alloy Steel

    HASHIBA Daisuke, HONMA Yuta, YANAGISAWA Yusuke, OCHIAI Tomoyuki, IKUSHIMA Kazuki, KAWAHARA Atsushi, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   42 ( 1 )   29 - 39   2024（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Weld residual stresses are affected by phase transformation of low-alloy steels. When phase transformation occurs, transformation plasticity occurs in addition to transformation expansion. Conventional predictions of welding residual stress using the finite element method often consider only transformation expansion, and there are few cases in which transformation plasticity is taken into factor. In this study, welding residual stress analysis that factors in transformation plasticity was performed to verify the effect of transformation plasticity on welding residual stress. The results show that the prediction accuracy of welding residual stress due to transformation expansion of low-alloy steel is improved by factors in transformation plasticity.

    DOI： 10.2207/qjjws.42.29

    CiNii Research

  • Development of digital twin for structures with thermal-elastic-plastic field

    R. Matsuoka, N. Minematsu, S. Maeda, K. Ikushima, M. Shibahara

    9th International Conference on Welding Science and Engineering   p.195 - p.195   2023.07

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    Kind of work：Joint Work  

  • AI-based optimization of welding sequence in multi-pass welding

    S. Hirose, H. Hashizume, T. Kato, K. Ikushima, M. Shibahara

    9th International Conference on Welding Science and Engineering   p.14 - p.14   2023.07

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    Kind of work：Joint Work  

  • Development of digital twin for structures with thermal-elastic-plastic field

    R. Matsuoka, N. Minematsu, S. Maeda, K. Ikushima, M. Shibahara

    9th International Conference on Welding Science and Engineering   p.195 - p.195   2023.07

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    Kind of work：Joint Work  

  • AI-based optimization of welding sequence in multi-pass welding

    S. Hirose, H. Hashizume, T. Kato, K. Ikushima, M. Shibahara

    9th International Conference on Welding Science and Engineering   p.14 - p.14   2023.07

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    Kind of work：Joint Work  

  • Study on influence of gas cutting on welding deformation after submerged arc welding at removing constraint jig plates Reviewed

    T. Kato, R. Ashida, K. Ikushima, S. Maeda, K. Ozaki, H. Nagaki, T. Omae, M. Shibahara

    Welding International   37 ( 4 )   226 - 236   2023.05

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    Kind of work：Joint Work  

  • Study on Automatic production of Arbitrary Shape by AI Linear Heating.

    HIROSE Sora, KATO Takuya, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   140 - 141   2023

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  • Creep Analysis of Large-scale Weld Pipe Structure in Thermal Power Plant

    Kitani Yuji, Yamauchi Yuki, Ikushima Kazuki, Nishida Hidetaka, Ninshu Ma, Shibahara Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   41 ( 2 )   58s - 62s   2023（ ISSN:02884771 ） （ eISSN:24348252 ）

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  • Effect of Load Changing on Creep fatigue Life of Pipe Joints

    Kitani Yuji, Ikushima Kazuki, Arai Masayuki, Nishida Hidetaka, Ninshu Ma, Shibahara Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   41 ( 2 )   36s - 40s   2023（ ISSN:02884771 ） （ eISSN:24348252 ）

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    To investigate the effect of load changing on creep fatigue life of pipe joints, a creep fatigue analysis was conducted by introducing evaluation method of the creep fatigue life developed by Arai et al. to Idealized Explicit FEM which can perform large scale nonlinear structural analysis with realistic computing resources. First, an analysis for simulating experimental phenomena was performed and the predicted creep fatigue life was compared with the measured one to verify the analysis accuracy. As a result, it was confirmed that the predicted creep fatigue life by the constructed method was in good agreement with the actual creep fatigue life. In addition, the predicted fracture locations by the analysis and the actual damage locations agreed each other. To confirm the effects of the bending and torsional moments, 203 different bending torsional conditions were assumed and their analyses were performed. It is found that the creep fatigue life can be shorter with the larger bending moment ratio.

    DOI： 10.2207/qjjws.41.36s

    CiNii Research

  • Mechanical study of Trans-Varestraint Test by Using Numerical Analysis of Hot Cracking Based on Idealized Explicit FEM

    MAEDA Shintaro, Wenda WANG, HABATA Masashi, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   41 ( 2 )   21s - 25s   2023（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Trans-Varestraint test is basically used for hot cracking susceptibility of materials. In the Trans-Varestrain test, bending deformation is applied to the specimen during welding to produce cracking. From the shape and size of cracks, the hot cracking susceptibility indices such as Brittle temperature range (BTR) and critical strain are obtained. The nominal strain generated by the bending can be calculated from the specimen thickness and the radius of the bending block. However, it has been reported that in this test, the estimated nominal strain and the actual strain acting on the weld metal differ significantly due to localized heat. In this study, hot cracking analysis using Idealized explicit FEM, which can compute large-scale thermal elastic-plastic analysis with smaller computing time and memory, is applied to the Trans-Varestraint test. The effects of heat input and test conditions on the mechanical behavior of the welded part during the Trans-Varestraint test are investigated. The results indicate that the strain acting on the welded part during the Trans-Varestraint test is larger than the nominal strain. In addition, it is found that the welding speed has a significant effect on the amount of strain acting on the molten part. It is suggested that these were caused by local melting of the specimens, resulting in a decrease in strength. In addition, bending speeds and welding speeds affect the amount of strain produced by bending and the size of the area in which the strain occurs. In other words, they affect the size of the region and the amount of strain generated in the BTR and have a significant effect on the maximum crack length obtained in the Trans-Varestraint test.

    DOI： 10.2207/qjjws.41.21s

    CiNii Research

  • Shell–solid Coupling Analysis for Mechanical Behavior of Complex Thin-plate Weld Structure

    Zhihao LI, YAMAUCHI Yuki, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   41 ( 2 )   31s - 35s   2023（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Complex thin-plate structures such as ships and bridges are welded together with numerous thin plates and stiffeners. Thermal elastic-plastic analysis based on the finite element method is a fundamental tool for predicting welding deformations and residual stresses in large steel structures. The shell-solid coupling method can improve the analysis scale and efficiency compared to the solid element method. This study aims to introduce the shell-solid coupling analysis method into welding mechanical analyses to improve the efficiency of computation and modeling. The guideline for the use of the proposed method was also investigated. The proposed shell-solid coupled analysis was constructed based on a multipoint constraint technique which erases the degrees of freedom at the shell-solid interface. It was applied to the analysis of welding mechanics of the fundamental T-joint model to validate the accuracy of the proposed shell-solid coupling analysis. The proposed method was also applied to the welding deformation analysis of a panel structure model for a car-carrier ship. The results revealed that computing time of the proposed method was less than 30 percent of that of the conventional FEM and the proposed method has almost the same analysis accuracy as conventional techniques. The proposed method could achieve a more efficient analysis than the conventional method.

    DOI： 10.2207/qjjws.41.31s

    CiNii Research

  • Study on Application of Efficient FE Modeling Technique in Analysis of Welding Mechanics

    MAEDA Shintaro, Zhihao LI, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   41 ( 2 )   16s - 20s   2023（ ISSN:02884771 ） （ eISSN:24348252 ）

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    Thermal elastic plastic (TEP) finite element analysis (FEA) is widely used to analyze welding mechanical phenomena such as welding deformation and residual stress. One of the problems of welding mechanical analysis using finite element method (FEM) is that it requires a lot of time for preprocessing such as modeling and meshing. In this study, the explicit master-slave elimination with multipoint constraints (MPCs) was introduced to the Idealized explicit FEM (IEFEM) for efficient FE modeling and welding mechanical analysis of large-scale complex structures. The proposed method was applied to T-joint welds to verify its accuracy when using the explicit master-slave elimination, and the effects of the ratio of master and slave element sizes on results of the heat conduction (HC) analysis and TEP analysis were investigated. As a result, it was confirmed that the welding mechanical analysis using the proposed method is in good agreement with the analysis results using the ordinary node-shared model. It was also confirmed that the analysis results did not agree when the element size of the slave was large compared to the element size of the master. Finally, the proposed method was also applied to the analysis of a welded structure including multi-layer welds and fillet welds for steel column-beam connections. It was confirmed that the proposed method was useful in performing fast calculations with highly efficient FE modeling for large-scale steel column-beam joint welds.

    DOI： 10.2207/qjjws.41.16s

    CiNii Research

  • Technical Commission on Welded Structure

    NAKATANI Mitsuyoshi, OHATA Mitsuru, SHIMANUKI Hiroshi, MA Ninshu, MIKAMI Yoshiki, SHIBAHARA Masakazu, OKANO Shigetaka, IKUSHIMA Kazuki, SHOJI Hiroto

    JOURNAL OF THE JAPAN WELDING SOCIETY   92 ( 5 )   334 - 345   2023（ ISSN:00214787 ） （ eISSN:18837204 ）

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  • Study on Influence of Various Factors on Welding Deformation of Aluminum Alloy

    ICHIKAWA Ryota, HABATA Masashi, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023f ( 0 )   248 - 249   2023

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  • Analysis for liquation Cracking of HAZ during Welding of Aluminum alloy.

    MAEDA Shintaro, Tezen Towa, HABATA Masashi, MORI Hiroaki, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   126 - 127   2023

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  • Application of Digital Twin for Thermo-Elastic-Plastic Fields to Gas Heating Experiments

    YAMABE Mitsuru, MINEMATSU Nobuyuki, MATSUOKA Ryo, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023f ( 0 )   258 - 259   2023

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  • Study on Mechanical Behavior during Friction Stir Welding using Numerical Simulation.

    MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023f ( 0 )   256 - 257   2023

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  • Development of Fast Prediction of Welding Residual Stress Using Machine Learning

    KATO Takuya, HIROSE Sora, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023f ( 0 )   268 - 269   2023

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  • Study on Simplified Analytical method of Columnar Solidification Growth under Weld Solidification Cracking

    HABATA Masashi, Wenda WANG, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   48 - 49   2023

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  • Numerical Study on Effect of Welding Residual Stress on Joint Strength

    YAMAUCHI Yuki, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023f ( 0 )   246 - 247   2023

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  • Development of Digital Twin of Structures with Thermal-Elastic-Plastic Field.

    MATSUOKA Ryo, YAMAUCHI Yuki, KATO Takuya, MAEDA Shintaro, MINEMATSU Nobuyuki, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   138 - 139   2023

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  • Study on Estimation of Remaining Life of Weld Heat Affected Zone in Power Plant Piping

    YAMAUCHI Yuki, MATSUOKA Ryo, KITANI Yuji, IKUSHIMA Kazuki, ARAI Masayuki, NISHIDA Hidetaka, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   144 - 145   2023

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  • Mechanical Study on Hot Cracking of Welding End During Welding of Weathering Steel of Deck Plate

    TEZEN Towa, MAEDA Shintaro, HABATA Masashi, IKUSHIMA Kazuki, NAGAKI Hayato, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   128 - 129   2023

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  • Development of AI Line Heating System for Automated Manufacturing of Ship Hulls

    KATO Takuya, HIROSE Sora, MAEDA Shintaro, IKUSHIMA Kazuki, NOTSU Akira, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2023s ( 0 )   142 - 143   2023

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  • 拘束治具取り外し時のガス切断がサブマージアーク溶接後の変形に及ぼす影響についての検討 Reviewed

    加藤 拓也, 芦田 崚, 生島 一樹, 前田 新太郎, 尾嵜 健人, 永木 勇人, 大前 暢, 柴原 正和

    溶接学会論文集   Vol.40 ( No.4 )   pp.186 - 194   2022.12

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    Kind of work：Joint Work  

  • Study on prevention method of hot cracking under butt welding Reviewed

    S. Maeda, M. Shibahara, K. Ikushima, T. Miwa, K. Yamazaki, K. Nishihara, H. Takeda, N. Ma

    Welding International   Vol.36 ( No.9 )   pp.543 - 554   2022.07

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    Kind of work：Joint Work  

  • Development of analysis method for hot cracking cosindering mechanical and metallurgical factors Reviewed

    S. Maeda, K. Ikushima, M. Shibahara, N. Ma

    Welding International   Vol.36 ( No.9 )   pp.530 - 542   2022.07

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    Kind of work：Joint Work  

  • Approach to automation of line heating by combination of reinforcement learning and finite element method simulation Reviewed

    M. Shibahara, K. Ikushima, M. Maekawa, R. Ashida, T. Kato, A. Notsu

    ASME Open Journal of Engineering   Vol.1   011024-1   2022.06

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    Kind of work：Joint Work  

  • Mechanical Study on Generation of Weld Crater Cracking.

    MAEDA Shintaro, HABATA Masashi, Wenda WANG, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   244 - 245   2022

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  • Study of Method for Estimating Mechanical State in Welding Based on Digital Twin．

    YAMAUCHI Yuki, TAKAHASHI Riku, KITANI Yuji, Ramy Gadallah, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022s ( 0 )   128 - 129   2022

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  • Study on Influence of Gas Cutting When Removing Constraint Jig Plates on Welding Deformation After Submerged Arc Welding

    KATO Takuya, ASHIDA Ryo, IKUSHIMA Kazuki, MAEDA Shintaro, OZAKI Kento, NAGAKI Hayato, OMAE Toru, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   40 ( 4 )   186 - 194   2022（ ISSN:0288-4771 ） （ eISSN:2434-8252 ）

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    In order to investigate the effect of gas cutting during removal of restraining jig on deformation after submerged arc welding, the authors have conducted the experiments on a series of processes using a constraint jig plates in a test specimen modeling the deck of a steel bridge. In this paper, an Idealized explicit FEM developed by the authors is applied to investigate in detail the factors that cause springback deformation during the gas cutting of the constraint jig plates.
    A series of welding and cutting processes using a constraint jig plates were modeled, and then a three-dimensional thermo-elastic-plastic analysis was performed using the Idealized explicit FEM. As a result, it is confirmed that the experimental and analytical results were in good agreement, and the validity of the analysis method was demonstrated. In addition, it is found that the inherent deformation during gas cutting had a significant influence on the springback deformation by the numerical analysis. Then, we proposed a simplified mechanical model to estimate the deformation during gas cutting. As a result, it was confirmed that the proposed mechanical model showed quantitatively good agreement with the springback deformation.

    DOI： 10.2207/qjjws.40.186

  • Developments in Digital Welding Mechanics

    SHIBAHARA Masakazu, IKUSHIMA Kazuki, MAEDA Shintaro

    JOURNAL OF THE JAPAN WELDING SOCIETY   91 ( 7 )   521 - 532   2022（ ISSN:00214787 ） （ eISSN:18837204 ）

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  • Digital Twin System for Estimation of Creep Damage in Welded Pipe Joint Using Data Assimilation.

    KITANI Yuji, Ninshu MA, Yamauchi Kazuki, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   252 - 253   2022

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  • Study on Digital Twin for Creep Deformation in Welded Pipe Structure

    YAMAUCHI Yuki, MATSUOKA Ryo, KITANI Yuji, IKUSHIMA Kazuki, SHIBAHAR Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   254 - 255   2022

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  • Study on Numerical Analysis of Varestraint Test.

    Wenda WANG, HABATA Masashi, MAEDA Shintaro, IKUSHIMA Kazuki, MORI Hiroaki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   180 - 181   2022

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  • Influece of Varation factors on Solidification Cracking Under Laser-arc Hybrid Welding

    KANEMOTO Kent, Wenda WANG, KAWAHARA Atushi, MAEDA Shintaro, IKUSHIMA Kaduki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022s ( 0 )   124 - 125   2022

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  • Proposal of Modified Thermal Shrinkage Technique and Its Application to Mechanical Problem of Welding.

    HABATA Masashi, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   230 - 231   2022

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  • Study on Estimation of Heat Distribution during Gas Heating

    MATSUOKA Ryo, MINEMATSU Nobuyuki, MAEDA Shintaro, KAWAHARA Atsushi, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   228 - 229   2022

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  • Study on a Method for Preventing Hot Cracking Forcused on Opening Behavior of Root Gap.

    ODA Yusuke, Wenda WANG, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   184 - 185   2022

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  • Study on Tab Plate Shape to Prevent Solidification Cracking Using Genetic Algorithm.

    MAEDA Shintaro, MITSUI Yuta, Wenda WANG, KATO Takuya, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022s ( 0 )   134 - 135   2022

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  • Study on Optimization of Welding Sequence for Ship Structural Members.

    MAEDA Shintaro, Zhihao LI, HIROSE Sora, NAKAMURA Takahito, NISHIHARA Kensaku, NAGAI Takuya, OKABE Toshiaki, TAKEDA Hiroyuki, KAWAHARA Atsushi, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   258 - 259   2022

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  • Study on Tab Plate Shape for Prevention of Solidification Cracking.

    KANEMOTO Kenta, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   250 - 251   2022

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  • Analysis of Welding Mechanics by Thermal Shrinkage Technique.

    TEZEN Towa, YASUDA Shogo, KATO Takuya, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022s ( 0 )   132 - 133   2022

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  • Study on Numerical Analysis of Welding Hot Cracking Test.

    Wenda WANG, KANEMOTO Kenta, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022s ( 0 )   126 - 127   2022

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  • Development of Surrogate Model for Fast Prediction of Residual Stress and Its Application

    KATO Takuya, HIROSE Sora, TANGO Yoshihiko, KOMADA Shuji, YAMAUCHI Yuki, NOZU Ryo, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   226 - 227   2022

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  • Study on Simplified Prediction Method of Inherent Strains by Gas Heating Using Machine Learning

    KATO Takuya, YAMAUCHI Yuki, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022s ( 0 )   130 - 131   2022

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  • Study on Simple Prediction of Deformation on Fillet Welding by Machine Learning.

    HIROSE Sora, KATO Takuya, MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   256 - 257   2022

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  • Numerical Study on Effect of Tool Shape on Mechanical Behavior during Friction Stir Welding

    Yamauchi Yuki, Li Zhihao, Kitani Yuji, Kuki Masaharu, Ikushima Kazuki, Shibahara Masakazu

    Tetsu-to-Hagane   108 ( 12 )   991 - 1001   2022（ ISSN:00211575 ） （ eISSN:18832954 ）

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    Publishing type：Research paper (scientific journal)  

    <p>In friction stir welding, tool shape can effect the mechanical behavior during joining. In this study, the effect of tool shape on the temperature distribution during joining was investigated using numerical simulation method based on particle method. The influence of joining condition such as rotational speed, traveling speed and tilt angle on cylindrical tool and semi-spherical tool were investigated using the particle method. From these results, it was found that the rotation speed and the traveling speed have larger effect than tilt angle on the temperature distribution. It was also found that the cylindrical tool and semi-spherical tool almost have same tendency corresponding to the parameter change. Stresses in tool were also investigated according to the predicted pressure distribution by the particle method. As a result, it was found that the semi-spherical tool can reduce the stress than the cylindrical tool.</p>

    DOI： 10.2355/tetsutohagane.tetsu-2022-044

    CiNii Research

  • Study on effect of tool shape during friction stir welding using numerical simulation.

    KUKI Masaharu, YAMAUCHI Yuki, IKUSHIMA Kazuki, SHIBAHARA Masakazu, MIYASAKA Fumikazu

    Preprints of the National Meeting of JWS   2022f ( 0 )   102 - 103   2022

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  • 突合せ溶接時の溶接高温割れ防止技術に関する検討 Reviewed

    前田 新太郎, 柴原 正和, 生島 一樹, 三輪 剛士, 山崎 圭, 西原 健作, 武田 裕之, 麻　寧緒

    溶接学会論文集 雑誌   Vol.39 ( No.4 )   pp.396 - 405   2021.12

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    Kind of work：Joint Work  

  • 力学および冶金学的因子を考慮した溶接高温割れ解析手法の開発 Reviewed

    前田 新太郎, 生島 一樹, 柴原 正和, 麻 寧緒

    溶接学会論文集 雑誌   Vol.39 ( No.4 )   pp.386 - 365   2021.12

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    Kind of work：Joint Work  

  • Numerical investigation on the effect of thickness and stress level on fatigue crack growth in notched specimens

    Ramy Gadallah, Hidekazu Murakawa, Kazuki Ikushima, Masakazu Shibahara, Seiichiro Tsutsumi

    THEORETICAL AND APPLIED FRACTURE MECHANICS   116   2021.12（ ISSN:0167-8442 ） （ eISSN:1872-7638 ）

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    Publishing type：Research paper (scientific journal)  

    The effect of specimen thickness on the behavior of fatigue crack growth rate (FCGR) requires rigorous investigation because the thickness effect is not independent and could be a function of the specimen geometry, material properties, loading conditions, and environmental conditions. The purpose of this study is to numerically investigate the effect of specimen thickness and stress level on the behavior of FCGR at the specimen-free surface and mid-thickness in notched mild steel specimens. Elastic-plastic numerical calculations were performed based on FEM using the domain integral method to calculate the cyclic J-integral parameter, Delta J, which was used for calculating FCGR. Different specimen thicknesses and various constant amplitude stress levels were used in the numerical calculations. Crack growth calculations were carried out using the node release technique in which the history of the former crack was considered. The calculated fatigue lives were firstly verified against the experiments taken from the literature. The results of numerical calculations showed that no significant thickness effect was noticed at the mid-thickness for calculations carried out below general yield while when the stress level is close to general yield the thinner specimens showed faster crack growth rates. Further, thickness has a remarkable effect on the crack growth rate at the free surface when the applied stress level is below and close to general yield where the thinner specimens gave faster crack growth rates. The crack-tip driving force Delta J and the local strains and stresses induced ahead of the crack front could explain the mechanics and behavior of FCGR for the applied thicknesses and stress levels. The distributions of the local strains and stresses could also reveal the effect of the local material ahead of the crack front on the behavior of crack growth.

    DOI： 10.1016/j.tafmec.2021.103138

  • Numerical investigation on the effect of thickness and stress level on fatigue crack growth in notched specimens Reviewed

    R. Gadallah, H. Murakawa, K. Ikushima, M. Shibahara, S. Tsutsumi

    Theoretical and Applied Fracture Mechanics   Vol.116   103138   2021.12

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    Kind of work：Joint Work  

  • Study on Mechanical Behavior during Friction Stir Welding Using Numerical Simulation Reviewed

    Ikushima Kazuki, Li Zhihao, Kitani Yuji, Maeda Shintaro, Miyasaka Fumikazu, Shibahara Masakazu

    Journal of Light Metal Welding   59 ( 5 )   10 - 16   2021.05（ ISSN:0368-5306 ） （ eISSN:2186-618X ）

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    In the present study, the authors proposed a numerical analysis procedure to evaluate both material flow and tool strength due to friction stir welding <tt>(</tt>FSW<tt>) </tt>using particle method and finite element method <tt>(</tt>FEM<tt>)</tt>.In the proposed evaluation method, material flow during FSW is simulated by the particle method. And then, the calculated pressure distribution on the tool surface is interpolated in the FEM analysis for the evaluation of tool strength. The proposed method was applied to the investigation of the influence of the traveling and rotation speed on the maximum temperature in the welded material. Stresses on the tool surface was also investigated using the proposed method. The result indicated that the traveling speed has large effect on surface stress while the effect of rotation speed on surface stress is small.

    DOI： 10.11283/jlwa.59.10

    CiNii Research

  • 摩擦撹拌接合時の力学的挙動の数値解析的検討 Reviewed

    生島 一樹, 李 志浩, 木谷 悠二, 前田 新太郎, 宮坂 史和, 柴原 正和

    軽金属溶接 雑誌   Vol.59 ( No.5 )   pp.170 - 176   2021.05

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    Kind of work：Joint Work  

  • 摩擦攪拌接合時の力学的挙動の数値解析的検討—Study on Mechanical Behavior during Friction Stir Welding Using Numerical Simulation

    生島 一樹, 李 志浩, 木谷 悠二, 前田 新太郎, 宮坂 史和, 柴原 正和

    軽金属溶接 = Journal of light metal welding : 軽金属溶接協会誌   59 ( 5 )   170 - 176   2021.05（ ISSN:0368-5306 ）

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  • Enhanced idealized explicit FEM for predicting welding deformation in complex large-scaled structure and application to the real structure Reviewed OA

    K. Ikushima, S. Maeda, T. Ieshita, A. Kawahara, Y. Abe, H. Kiuchi, M. Shibahara

    Welding International 雑誌   Vol.33 ( Issue 1 )   pp.1 - 16   2021.02

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017404

  • Study on Prevention Method of Hot Cracking Under Butt Welding

    MAEDA Shintaro, SHIBAHARA Masakazu, IKUSHIMA Kazuki, MIWA Tsuyoshi, YAMAZAKI Kei, NISHIHARA Kensaku, TAKEDA Hiroyuki, MA Ninshu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   39 ( 4 )   396 - 405   2021（ ISSN:0288-4771 ） （ eISSN:2434-8252 ）

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    For the automation of butt welding, it has been considered to introduce tack welds instead of out-of-plane restraint jigs to perform welding with large heat input. However, the occurrence of hot cracking has been a significant issue in large heat input welding. In the previous report, the authors have developed a prediction method of hot cracking that can investigate the influence of not only the high temperature strain generated in the weld metal but also the phenomena related to solidification such as solidification shrinkage, latent heat of solidification and crystals growth direction. In this study, the conditions for prevention of hot cracking were investigated by numerical analysis and experiments through controlling the temperature gradient at solidification temperature using a trailing torch in tandem welding. As a result, it was confirmed that the large strain existing position predicted using proposed hot cracking analysis has a good agreement with the cracking position observed experimentally in tandem butt weld. It was also found that with increasing the electrode distance, both the columnar crystals associate angle became larger and the local strain became smaller. It can be concluded that the hot cracking can be successfully prevented in the practical experiments using the proposed large electrode distance.

    DOI： 10.2207/qjjws.39.396

    CiNii Research

    Other URL： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H02366/

  • Enhanced idealized explicit FEM for predicting welding deformation in complex large-scaled Reviewed

    生島 一樹, 柴原 正和

    Welding International   Vol.33:1-3   1 - 16   2021

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    Publishing type：Research paper (scientific journal)  

  • Development of Analysis Method for Hot Cracking Considering Mechanical and Metallurgical Factors

    MAEDA Shintaro, IKUSHIMA Kazuki, SHIBAHARA Masakazu, MA Ninshu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   39 ( 4 )   386 - 395   2021（ ISSN:0288-4771 ） （ eISSN:2434-8252 ）

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    Since welding hot cracking is one of the most harmful defects which may largely reduce the strength of welded joints and structures, it is very important to study the prediction and prevention of its generation. Hot cracking is caused by both mechanical and metallurgical factors.
    In this research, authors proposed a new computational method for evaluating the occurrence of hot cracking through considering both mechanical and metallurgical behavior. As the metallurgical behavior, strain due to solidification shrinkage and mechanical resistance of molten metal were modelled using the solidification ratio as a parameter. The mechanical behavior, an index for generation of hot cracking using the increment of plastic strain is proposed. In addition, authors proposed a simplified prediction method using the temperature gradient for the direction of columnar crystal growth, which affects the location of hot cracking, and is used to evaluate the associate angle of the columnar crystals.
    The developed method was applied to butt welding. As a result, it was found that the predicted direction of columnar crystal growth by the proposed method is in good agreement with the experimental results. In addition, the generation of hot cracking in the same butt welding was predicted using the proposed method and the obtained cracking positions agreed well with those observed by experiment. The Influence of the strain of solidification shrinkage on hot cracking was investigated in relation to the surrounding constraints, the temperature gradient and solidification mode, which are presumed to be highly related to the occurrence of hot cracking.
    From the above results, it can be concluded that the proposed method can analyze the effects of mechanical and metallurgical factors on hot
    cracking.

    DOI： 10.2207/qjjws.39.386

    DOI： 10.2207/qjjws.39.396_references_DOI_VL0vNCoqhatNk55WcfHAvSdWZUT

    CiNii Research

    Other URL： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H02366/

  • Nonlinear mechanical FE analysis of thin-plate complex structures using the shell-solid mixed method Reviewed OA

    K. Ikushima

    39th International Conference on Ocean, Offshore and Arctic Engineering 雑誌   OMAE2020 - 19174   2020.08

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017420

  • Technical Commission on Welded Structure Invited

    Masahito MOCHIZUKI, Masakazu SHIBAHARA, Seiichiro TSUTSUMI, Yoshiki MIKAMI, Kazuki IKUSHIMA, Shigetaka OKANO

    Journal of the Japan Welding Society   89 ( 5 )   358 - 365   2020.07（ ISSN:0021-4787 ）

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  • Efficient modelling on analysis of welding mechanics using mesh superposition method Reviewed

    K. Ikushima, R. Ashida, M. Shibahara

    溶接学会論文集 雑誌   Vol.38 ( No.2 )   pp.120s - 125s   2020.06

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    Kind of work：Joint Work  

  • Prediction of welding deformation of automotive component using large-scale thermal elastic plastic analysis method Reviewed

    K. Ikushima, S. Maeda, T. Uchimura, A. Kawahara, M. Shibahara, H. Kuwabara, H. Kanetake

    溶接学会論文集 雑誌   Vol.38 ( No.2 )   pp.149s - 153s   2020.06

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    Kind of work：Joint Work  

  • コンター法を用いた実構造物の残留応力計測 Reviewed

    生島 一樹, 柴原 正和, 河尻 義貴, 沖見 優衣, 内田 友樹, 秋田 貢一, 鈴木 裕士, 諸岡 聡

    日本船舶海洋工学会論文集 雑誌   Vol.30   pp.123 - 130   2019.12

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    Kind of work：Joint Work  

  • 2019A-GS15-4 Efficient Modelling of Thin-plate Complex Structures Using Shell-solid Mixed Analysis

    Ikushima Kazuki

    Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers   29 ( 29 )   379 - 388   2019.11（ ISSN:2185-1840 ） （ eISSN:2424-1628 ）

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  • 大規模複雑構造物の溶接変形解析に向けた理想化陽解法FEMの拡張と実大構造物への適用 Reviewed

    生島 一樹, 前田 新太郎, 家下 輝也, 河原 充, 阿部 雄太, 木内 大貴, 柴原 正和

    溶接学会論文集 雑誌   37 ( 4 )   141 - 151   2019.10

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    Kind of work：Joint Work  

  • Effects of half breadth to draught ratio of hull under water surface on bilge-keel roll damping component Reviewed

    T. Katayama, M. Matsuoka, T. Adachi, K. Ikushima

    Ocean Engineering 雑誌   188 ( 15 )   2019.09

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    Kind of work：Joint Work  

  • Numerical Investigation on Persistence of Modified Residual Stresses Due to Shot Peening Reviewed

    K. Ikushima, Y. Yamada, M. Shibahara, K. Akita, S. Nishikawa

    E-Journal of Advanced Maintenology 雑誌   11 ( 2 )   79 - 85   2019.09

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    Kind of work：Joint Work  

  • Effects of half breadth to draught ratio of hull under water surface on bilge-keel roll damping component

    Toru Katayama, Masaki Matsuoka, Toshiya Adachi, Kazuki Ikushima

    OCEAN ENGINEERING   188   2019.09（ ISSN:0029-8018 ）

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    Publishing type：Research paper (scientific journal)  

    Roll amplitudes of parametric roll in regular head waves are sometimes underestimated by motion calculations including Ikeda's roll damping prediction method, especially for the case of the large roll amplitude caused by high wave height. In this case, generally the ship has significant relative draught changing because of its heave and pitch. It may be said that the effects of the change in relative draught on roll damping is significant. However, in Ikeda's prediction method, the bilge-keel component which is the largest component of total roll damping does not take the effects of draught. As the effects of draught, there are at least two related significant effects on the bilge-keel roll damping component not fully considers for developing Ikeda's prediction method. They are the effects of underwater hull aspects (: half breadth to draught ratio) and the free surface effects. In this study, as a first attempt, the effects of draught on the bilge-keel component are investigated experimentally and numerically by using a 2-dimensional model. And a prediction model of the effects of draught on bilge-keel component to collect Ikeda's prediction method is proposed. Moreover, the calculated results by the proposed method are compared with some measured data including the effects of draught and its validity is confirmed.

    DOI： 10.1016/j.oceaneng.2019.106283

  • Numerical simulation of stress behavior during shot peening Reviewed

    K. Ikushima, Y. Yamada, M. Shibahara, S. Nishikawa, K. Akita

    Mathematical Modeling of Weld Phenomena 雑誌   12   417 - 429   2019.06

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    Kind of work：Joint Work  

  • 姿勢安定装置付きスパーブイの波浪中運動特性—Motion Characteristics of a Spar-Buoy with Ring-Fin Motion Stabilizer in Waves

    片山 徹, 山本 裕介, 森本 大嗣, 生島 一樹, 橋本 博公, 麻生 裕司

    日本船舶海洋工学会講演会論文集 Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers   ( 28 )   561 - 565   2019.06（ ISSN:2185-1840 ）

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  • Nonlinear Computational Welding Mechanics for Large Structures

    Kazuki Ikushima, Masakazu Shibahara

    JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME   141 ( 2 )   2019.04（ ISSN:0892-7219 ） （ eISSN:1528-896X ）

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    Publishing type：Research paper (scientific journal)  

    In the construction of thin plate steel structures, including ships, welding is widely used to join parts. Welding inevitably causes deformation in thin plate structures, which may cause various problems. In the present study, an analysis method is developed to realize the prediction of deformation during the construction of large-scale structures based on the thermal elastic plastic analysis method. The developed method uses the idealized explicit finite element method (IEFEM), which is a high-speed thermal elastic plastic analysis method, and an algebraic multigrid method (AMG) is also introduced to the IEFEM in order to realize an efficient analysis of large-scale thin plate structures. In order to investigate the analysis accuracy and the performance of the developed method, the developed method is applied to the analysis of deformation on the welding of a simple stiffened structure. The developed method is then applied to the prediction of welding deformation in the construction of a ship block. The obtained results indicate that the developed method has approximately the same analysis accuracy as the conventional method, and the computational speed of the developed method is dramatically faster than that of the conventional method. The developed method can analyze the welding deformation in the construction of the ship block structure which consists of more than 10 million degrees-of-freedom and is difficult to solve by the conventional method.

    DOI： 10.1115/1.4041395

  • 姿勢安定装置付きスパーブイの波浪中運動特性

    片山 徹, 森本 大嗣, 橋本 博公, 山本 裕介, 生島 一樹, 麻生 裕司

    日本船舶海洋工学会講演会論文集   28   561 - 566   2019（ eISSN:2424-1628 ）

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  • Practical Measurement of Residual Stresses Using Contour Method

    Ikushima Kazuki, Shibahara Masakazu, Kawajiri Yoshitaka, Okimi Yui, Uchida Tomoki, Akita Koichi, Suzuki Hiroshi, Morooka Satoshi

    Journal of the Japan Society of Naval Architects and Ocean Engineers   30   123 - 130   2019（ ISSN:1880-3717 ） （ eISSN:1881-1760 ）

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    In this research, the contour method was applied to measure the residual stress distribution of a bead-on-plate specimen. The measured residual stress distribution was compared with those measured by neutron diffraction method and calculated by thermal elastic plastic finite element analysis. As a result, it was found that the residual stress distribution obtained by these three methods are in good agreement. In addition, the equilibrium of reaction force on cut plane was considered in the contour method to measure residual stresses in asymmetric cutting which is assumed in the measurement of real structures. The proposed method was applied to the measurement of the residual stress in the multi-pass welded joint. The measured results indicated that the proposed method can measure the residual stress distribution in multi-pass welded joint in asymmetric test specimen.

    DOI： 10.2534/jjasnaoe.30.123

    CiNii Research

    Other URL： http://id.ndl.go.jp/bib/030238983

  • Enhanced Idealized Explicit FEM for Predicting Welding Deformation in Complex Large-Scaled Structure and Application to the Real Structure

    IKUSHIMA Kazuki, MAEDA Shintaro, IESHITA Teruya, KAWAHARA Atsushi, ABE Yuuta, KIUCHI Hirotaka, SHIBAHARA Masakazu

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY   37 ( 4 )   141 - 151   2019（ ISSN:0288-4771 ） （ eISSN:2434-8252 ）

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    In the fabrication of steel structures, welding is widely utilized to join the materials. Due to the welding, distortions are inevitably generated, and these distortions may cause problems in accuracy or labor costs. In this research, to establish an analysis method which can predict the welding distortions in complex large-scale structures, we proposed a new analysis method based on the Idealized Explicit FEM. In the proposed method, an algebraic multigrid method was introduced to the Idealized Explicit FEM to achieve an efficient analysis in realistic structures. The proposed method was applied to the prediction of the welding distortion in the base structures of the construction machine. The number of welding passes was 28. The predicted and measured distortions were compared. As a result, it was demonstrated that the proposed method has a high analysis accuracy. The analysis finished within the realistic time within 35 hours. The influence of welding sequence on the deformation was also investigated by changing welding sequence. The result indicated that the welding sequence may have considerable effect on the welding distortion and is necessary to be investigated in advance of the production.

    DOI： 10.2207/qjjws.37.141

    DOI： 10.1299/transjsme.21-00301_references_DOI_AfIfI4PXIOwvdLe8jDLI4WfXKn7

    CiNii Research

    Other URL： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H02366/

  • Numerical investigation on persistence of modified residual stresses due to shot peening

    K. Ikushima, Y. Yamada, M. Shibahara, K. Akita, S. Nishikawa

    4th International Conference on Maintenance Science and Technology, Sendai, 雑誌   Poster - 1   2018.10

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    Kind of work：Joint Work  

  • Nonlinear Computational Welding Mechanics for Large Structures Reviewed

    K. Ikushima, M. Shibahara

    Journal of Offshore Mechanics and Ocean Engineering, , , 雑誌   Vol.141 ( No.2 )   2018.09

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    Kind of work：Joint Work  

  • Characteristics of bilge-keel roll damping component for shallow draft

    T. Katayama, M. Matsuoka, K. Ikushima

    13th International Conference on the Stability of Ships and Ocean Vehicles, 雑誌   pp.350 - 359   2018.09

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    Kind of work：Joint Work  

  • Ultimate strength analysis of structures considering effect of welding distortions and residual stresses

    K. Ikushima, T. Harada, M. Shibahara

    7th International Maritime Conference on DESIGN FOR SAFETY, 雑誌   pp.64 - 73   2018.09

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    Kind of work：Joint Work  

  • ショットピーニングで付与した圧縮残留応力の長期持続性を予測するためのFEM解析手法の開発 Reviewed

    西川 聡, 古川 敬, 柴原 正和, 生島 一樹, 山田 祐介, 秋田 貢一, 鈴木 裕士, 諸岡 聡

    火力原子力発電,, , 雑誌   Vol.69 ( No.6 )   pp.21 - 28   2018.06

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    Kind of work：Joint Work  

  • Numerical analysis of residual stress distribution after shot peening using large scale simulation

    Y. Kitani, K. Ikushima, M. Shibahara, S. Nishikawa, T. Furukawa, K. Akita, H. Suzuki, S. Morooka

    7th International Conference on Welding Science and Engineering, 雑誌   pp.344 - 345   2017.10

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    Kind of work：Joint Work  

  • Construct of friction stir welding simulation method by particle method and FEM

    T. Ieshita, K. Ikushima, M. Shibahara, H. Miyasaka

    7th International Conference on Welding Science and Engineering, 雑誌   pp.501 - 502   2017.10

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    Kind of work：Joint Work  

  • Numerical study on weld buckling distortion in thin plate

    S. Maeda, K. Ikushima, M. Shibahara

    7th International Conference on Welding Science and Engineering, 雑誌   pp.482 - 483   2017.10

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    Kind of work：Joint Work  

  • Investigation on fracture mode of spot weld joint simplified fracture analysis method

    K. Ikushima, M. Kawase, T. Yano, R. Natsume, M. Shibahara

    7th International Conference on Welding Science and Engineering, 雑誌   pp.480 - 481   2017.10

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    Kind of work：Joint Work  

  • Mechanical study on solidification cracking during laser welding

    Y. Yamada, S. Maeda, K. Ikushima, M. Shibahara, H. Mori

    7th International Conference on Welding Science and Engineering, 雑誌   pp.478 - 479   2017.10

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    Kind of work：Joint Work  

  • Large Deformation Thermal Elastic- Plastic Analysis of Thin-plate Structure

    S. Maeda, K. Ikushima, M. Shibahara

    The 31st Asian- Pacific Technical Exchange and Advisory Meeting on Marine Structures, 雑誌   pp.252 - 258   2017.09

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    Kind of work：Joint Work  

  • Influence of Various Factors on Welding Distortion of Thin-plate Structures Reviewed

    M. Shibahara, T. Harada, S. Maeda, K. Ikushima

    溶接学会論文集, , , 雑誌   Vol.35 ( No.2 )   pp.146s - 150s   2017.09

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    Kind of work：Joint Work  

  • Numerical Optimization of Groove Shape and Welding Sequence on T-joint Multi Passes Welding and Validation by Welding Test Reviewed

    T. Saito,　D. Takakura,　M. Shibahara,　A. Kawahara,　K. Ikushima

    溶接学会論文集, , , 雑誌   Vol.35 ( No.2 )   pp.141s - 145s   2017.09

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    Kind of work：Joint Work  

  • Prediction of Shot Peened Residual Stresses Using Large Scale Numerical Analysis

    Y. Kitani, K. Ikushima, M. Shibahara

    The 31st Asian- Pacific Technical Exchange and Advisory Meeting on Marine Structures, 雑誌   pp.196 - 199   2017.09

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    Kind of work：Joint Work  

  • Numerical investigation of persistence of modified residual stresses due to shot peening

    K. Ikushima, Y. Kitani, Y. Yamada, M. Shibahara, K. Akita, H. Suzuki, S. Morooka, S. Nishikawa, T. Furukawa

    The 70th Annual Assembly of the International Institute of Welding, 雑誌   IIW Doc. X - 1887   2017.06

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    Kind of work：Joint Work  

  • Numerical analysis of residual stress distribution on peening process Reviewed OA

    K. Ikushima, M. Shibahara, K. Akita, H. Suzuki, S. Morooka, S. Nishikawa, T. Furukawa

    Welding in the World, , , 雑誌   Vol.61 ( No.3 )   pp.517 - 527   2017.03

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017180

  • In-situ residual stress analysis during thermal cycle of a dissimilar weld joint using neutron diffraction and IEFEM Reviewed

    K. Akita, H. Suzuki, S. Morooka, S. Harjo, T. Kawasaki, V. Luzin, M. Shibahara, K. Ikushima, S. Nishikawa, T. Furukawa

    溶接学会論文集, , , 雑誌   Vol.35 ( No.2 )   pp.112s - 116s   2017.03

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    Kind of work：Joint Work  

  • Study on shot peened residual stress distribution under cyclic loading by numerical analysis Reviewed

    K. Ikushima, Y. Kitani, M. Shibahara, S. Nishikawa, T. Furukawa, K. Akita, H. Suzuki, S. Morooka

    溶接学会論文集, , , 雑誌   Vol.35 ( No.2 )   pp.75s - 79s   2017.03

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    Kind of work：Joint Work  

  • Study on fracture mode of spot weld joint using continuum damage mechanics model Reviewed

    K. Ikushima, T. Yano, R. Natsume, M. Shibahara, M. Ohata

    溶接学会論文集, , , 雑誌   Vol.35 ( No.2 )   pp.28s - 32s   2017.02

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    Kind of work：Joint Work  

  • Large-scale residual stress analysis of multi-pass welded pipe joint using Idealized Explicit FEM accelerated by a GPU Reviewed

    K. Ikushima, M. Shibahara

    Mathematical Modeling of Weld Phenomena , 雑誌   11   pp.345 - 360   2016.12

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    Kind of work：Joint Work  

  • Analysis of welding deformation on construction of large thin-plate structure by Idealized Explicit FEM using multigrid method Reviewed

    K. Ikushima, T. Harada, M. Shibahara

    Mathematical Modeling of Weld Phenomena, 雑誌   11   pp.295 - 307   2016.12

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    Kind of work：Joint Work  

  • Study on residual stress distribution on shot peening process using large scale numerical analysis

    K. Ikushima, Y. Kitani, M. Shibahara, S. Nishikawa, K. Akita, H. Suzuki, S. Morooka

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.241 - 242   2016.10

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    Kind of work：Joint Work  

  • Residual stress behavior of dissimilar weld joint under thermal cycle examined by neutron diffraction and Idealized Explicit FEM

    K. Akita, H. Suzuki, S. Morooka, S. Harjo, T. Kawasaki, V. Luzin, M. Shibahara, K. Ikushima, S. Nishikawa, T. Furukawa

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.267 - 268   2016.10

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    Kind of work：Joint Work  

  • Study on influence of various factors on welding distortion of thin-plate structures

    T. Harada, S. Maeda, K. Ikushima, M. Shibahara

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.265 - 266   2016.10

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    Kind of work：Joint Work  

  • Study on fracture mode of spot weld joint using continuum damage mechanics model

    K. Ikushima, T. Yano, R. Natsume, M. Shibahara, M. Ohata

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.263 - 264   2016.10

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    Kind of work：Joint Work  

  • Enhanced large-scale analysis method and its application to multi-axial pipe weld Reviewed OA

    K. Ikushima, T. Minamino, A. Kawahara, H. Yuto, A. Nagai, K. Tani, T. Tsuji, J. Yamada, M. Nakatani, M. Shibahara

    Welding in the World, , , 雑誌   Vol.60 ( No.5 )   pp.915 - 929   2016.07

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017179

  • Numerical analysis of residual stress distribution on peening process

    K. Ikushima, M. Shibahara, K. Akita, S. Nishikawa, T. Furukawa

    The 69th Annual Assembly of the International Institute of Welding, 雑誌   IIW Doc. X - 1852   2016.07

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    Kind of work：Joint Work  

  • Nonlinear Computational Welding Mechanics for Large Structures Reviewed

    K. Ikushima, M. Shibahara

    35th International Conference on Ocean, Offshore and Arctic Engineering , 雑誌   OMAE2016 - 54313   2016.06

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    Kind of work：Joint Work  

  • Fluid-Structure Interaction Analysis by Interface Tracking Method Using Background Mesh

    K. Ikushima, M. Shibahara, T. Moan

    3rd International Conference on Violent Flows, 雑誌   CD - ROM   2016.03

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    Kind of work：Joint Work  

  • Large-scale non-linear analysis of residual stresses in multi-pass pipe welds by Idealized Explicit FEM Reviewed OA

    K. Ikushima, M. Shibahara

    Welding in the World, , , 雑誌   Vol.59 ( No.6 )   pp.839 - 850   2015.10

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017178

  • Study on solidification cracking under high-speed narrow gap welding with tandem torches Reviewed

    T. Harada, K. Ikushima, M. Shibahara, F. Kimura, T. Morimoto

    溶接学会論文集, , , 雑誌   Vol.33 ( No.2 )   pp.190s - 194s   2015.09

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    Kind of work：Joint Work  

  • Study on Solidification Cracking Under High-speed Narrow Gap Welding with Tandem Torches Reviewed

    M. Shibahara, K. Ikushima, T. Harada, F. Kimura, T. Morimoto

    The Proceedings of 25th International Offshore and Polar Engineering Conference, , 雑誌   Vol.4   pp.271 - 278   2015.07

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    Kind of work：Joint Work  

  • Large-Scale Welding Deformation Analysis of Ship Structure by Idealized Explicit FEM Reviewed

    K. Ikushima, K. Kaigaishi, M. Shibahara

    The Proceedings of 25th International Offshore and Polar Engineering Conference, , 雑誌   Vol.4   pp.263 - 270   2015.07

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    Kind of work：Joint Work  

  • Enhanced large-scale analysis method and its application to multi-axial pipe weld

    K. Ikushima, T. Minamino, A. Kawahara, M. Shibahara, H. Yuto, A. Nagai, K. Tani, T. Tsuji, J. Yamada, M. Nakatani

    The 68th Annual Assembly of the International Institute of Welding, 雑誌   IIW Doc. X - 1825   2015.07

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    Kind of work：Joint Work  

  • Study on welding distortion of stiffened thin-plate structures using Idealized Explicit FEM Reviewed

    K. Ikushima, M. Shibahara

    溶接学会論文集, , , 雑誌   Vol.33 ( No.2 )   pp.175s - 179s   2015.07

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    Kind of work：Joint Work  

  • Development of 3D coupling analysis method for spot welding by Idealized Explicit FEM Reviewed

    K. Ikushima, R. Natsume, M. Shibahara

    溶接学会論文集, , , 雑誌   Vol.33 ( No.2 )   pp.88s - 92s   2015.07

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    Kind of work：Joint Work  

  • Development of Idealized Explicit FEM using GPU parallelization and its application to large-scale analysis of residual stress of multi-pass welded pipe joint Reviewed OA

    K. Ikushima, S. Itoh, M. Shibahara

    Welding in the World, , , 雑誌   Vol.59 ( No.4 )   pp.589 - 595   2015.07

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017177

  • 理想化陽解法FEMによる円筒多層溶接継手の3次元移動熱源残留応力解析 Reviewed

    生島 一樹, 伊藤 真介, 西川 聡, 柴原 正和

    溶接学会論文集, , , 雑誌   Vol.33 ( No.1 )   pp.69 - 81   2015.04

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    Kind of work：Joint Work  

  • 反復サブストラクチャー法を導入した理想化陽解法FEMによる大規模溶接変形残留応力解析 Reviewed

    生島 一樹, 伊藤 真介, 高倉 大典, 津乗 充良, 柴原 正和

    溶接学会論文集, , , 雑誌   Vol.32 ( No.4 )   pp.223 - 234   2015.01

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    Kind of work：Joint Work  

  • Development of Three-Dimensional Coupling Analysis for Spot Welding by Idealized Explicit FEM

    K. Ikushima, M. Shibahara

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.140 - 141   2014.12

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    Kind of work：Joint Work  

  • Study on Nugget Shapes under Spot Welding using Three-Dimensional Coupling Analysis

    R. Natsume, T. Shigemasa, K. Ikushima, M. Shibahara

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.303 - 304   2014.12

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    Kind of work：Joint Work  

  • Study on Welding Distortion of a Stiffened Thin Plate Structure Using Idealized Explicit FEM

    K. Ikushima, M. Shibahara

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.301 - 302   2014.12

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    Kind of work：Joint Work  

  • Prediction of residual stresses in multi-pass welded joint using Idealized Explicit FEM accelerated by a GPU Reviewed OA

    K. Ikushima, M. Shibahara

    Computational Materials Science,, 雑誌   Vol.93   pp.62 - 67   2014.07

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    Kind of work：Joint Work  

    Repository URL： http://hdl.handle.net/10466/00017176

  • Large scale non-linear analysis of residual stresses in multi-pass pipe welds by Idealized Explicit FEM

    K. Ikushima, M. Shibahara

    The 67th Annual Assembly of the International Institute of Welding, 雑誌   IIW Doc. X - 1776   2014.07

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    Kind of work：Joint Work  

  • Three-dimensional in situ measurement system for welding deformation using digital camera

    M. Shibahara, M. Hamada, K. Ikushima S. Itoh

    Proceedings of the 1st International Joint Symposium on Joining and Welding, 雑誌   pp.531 - 536   2013.11

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    Kind of work：Joint Work  

  • Study on residual stress in multi-pass welded joint using idealized explicit FEM

    M. Shibahara, A. Takeuchi, T. Okada, S. Itoh, S. Nishikawa, K. Ikushima

    Proceedings of the 1st International Joint Symposium on Joining and Welding, 雑誌   pp.537 - 545   2013.11

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    Kind of work：Joint Work  

  • Development of high-speed analytical method for welding mechanics using Idealized Explicit FEM accelerated by a GPU

    K. Ikushima, A. Kawahara, M. Shibahara

    Proceedings of the 1st International Joint Symposium on Joining and Welding, 雑誌   pp.523 - 530   2013.11

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    Kind of work：Joint Work  

  • Numerical analysis of welding deformation for large-scale structure Reviewed

    K. Ikushima, S. Itoh, M. Shibahara

    溶接学会論文集, , , 雑誌   Vol.31 ( No.4 )   pp.138 - 142   2013.10

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    Kind of work：Joint Work  

  • Numerical Analysis of Welding Deformation for Thin Plate Welded Structures Using Idealized Explicit FEM

    K. Ikushima, A. Takeuchi, T. Okada, S. Itoh, S. Nishikawa, M. Shibahara

    5th International Conference on Welding Science and Engineering, 雑誌   pp.239 - 242   2013.10

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    Kind of work：Joint Work  

  • Study on Residual Stress in Multi-pass Welded Joint of Pipe Using Idealized Explicit FEM

    K. Ikushima, M. Yamamoto, A. Kawahara, M. Shibahara

    5th International Conference on Welding Science and Engineering, 雑誌   pp.237 - 238   2013.10

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    Kind of work：Joint Work  

  • Heat Conduction Analysis of Welding Using Idealized Explicit FEM

    K. Ikushima, N. Tahara, M. Shibahara

    5th International Conference on Welding Science and Engineering, 雑誌   pp.233 - 236   2013.10

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    Kind of work：Joint Work  

  • Influence of Tack Welds on Welding Deformation During Butt Welding

    M. Shibahara, M. Hamada, S. Kon, K. Ikushima

    5th International Conference on Welding Science and Engineering, 雑誌   pp.231 - 232   2013.10

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    Kind of work：Joint Work  

  • Large-scale Analysis of Welding Residual Stress Problem by Idealized Explicit FEM Using Iterative Substructure Method

    K. Ikushima, M. Shibahara

    5th International Conference on Welding Science and Engineering, 雑誌   pp.127 - 130   2013.10

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    Kind of work：Joint Work  

  • Heat conduction analysis of welding using Idealized Explicit FEM Reviewed

    K. Ikushima, S. Itoh, M. Shibahara

    溶接学会論文集, , , 雑誌   Vol.31 ( No.4 )   pp.153 - 157   2013.10

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    Kind of work：Joint Work  

  • Development of Analytical Method for Welding Mechanics Using Idealized Explicit FEM

    K. Ikushima, T. Shigemasa, A. Kawahara, M. Shibahara

    The 27th Asia-Pacific Technical Exchange and Advisory Meeting on Maritime Structures, 雑誌   pp.703 - 710   2013.09

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    Kind of work：Joint Work  

  • Development of Idealized Explicit FEM Using GPU Parallelization and Its Application to Large-scale Analysis of Residual Stress of Multi-pass Welded Pipe Joint

    K. Ikushima, S. Itoh, M. Shibahara

    The 66th Annual Assembly of the International Institute of Welding, 雑誌   IIW Doc. X - 1741   2013.09

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    Kind of work：Joint Work  

  • Time-history measurement of welding deformation using digital image correlation technique Reviewed

    M. Shibahara, K. Ikushima, S. Itoh, T. Fukasawa

    International Journal of Offshore and Polar Engineering, , 雑誌   Vol.23 ( No.2 )   pp.152 - 159   2013.06

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    Kind of work：Joint Work  

  • GPUを用いた並列化理想化陽解法FEMの開発 Reviewed

    生島 一樹, 伊藤 真介, 柴原 正和

    溶接学会論文集, , , 雑誌   Vol.31 ( No.1 )   pp.23 - 32   2013.03

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    Kind of work：Joint Work  

  • Numerical Analysis of Welding Deformation for Large-Scale Structure

    K. Ikushima, S. Itoh, M. Shibahara

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.95 - 96   2012.12

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    Kind of work：Joint Work  

  • Heat Conduction Analysis of Welding Using Idealized Explicit FEM

    K. Ikushima, S. Itoh, M. Shibahara

    The International Symposium on Visualization in Joining & Welding Science Through Advanced Measurements and Simulation, , 雑誌   Vol.1   pp.315 - 316   2012.12

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    Kind of work：Joint Work  

  • Development of in-situ measurement system for welding deformation using digital cameras Reviewed

    M. Shibahara, K. Ikushima, S. Itoh

    Science and Technology of Welding & Joining, , , 雑誌   Vol.17 ( No.6 )   pp.511 - 517   2012.08

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    Kind of work：Joint Work  

  • Prediction of Residual Stress in Multi-pass Welded Joint Using Idealized Explicit FEM Reviewed

    M. Shibahara, S. Itoh, T. Okada, K. Ikushima, S. Nishikawa

    Proceedings of the ASME 2012 Pressure Vessels & Piping Conference, , 雑誌   Vol.1   pp.667 - 686   2012.07

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    Kind of work：Joint Work  

  • Development of Ultra Large Scale Computation for Transient Welding Deformation and Stress Using Idealized Explicit FEM Accelerated by GPU Reviewed

    K. Ikushima, S. Itoh, M. Shibahara

    Proceedings of the ASME 2012 Pressure Vessels & Piping Conference, , 雑誌   Vol.1   pp.657 - 665   2012.07

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    Kind of work：Joint Work  

  • Heat Conduction Analysis of Welding Moving Heat Source Problem Using Idealized Explicit FEM Reviewed

    K. Ikushima, T. Okada,, S. Itoh, M. Shibahara

    The Proceedings of 22nd International Offshore and Polar Engineering Conference, , 雑誌   Vol.4   pp.224 - 237   2012.06

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    Kind of work：Joint Work  

  • Large-scale Computation for Welding Mechanics Using Idealized Explicit FEM Accelerated by a GPU Reviewed

    K. Ikushima, S. Itoh, M. Shibahara

    The Proceedings of 22nd International Offshore and Polar Engineering Conference,, 雑誌   Vol.4   pp.224 - 237   2012.06

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    Kind of work：Joint Work  

  • Analysis of Welding Deformation for Thin Plate Welded Structure Using Idealized Explicit FEM

    T. Shigemasa, K. Ikushima, S. Itoh, M. Shibahara

    International Conference on Maritime Technology, 雑誌   pp.245 - 249   2012.06

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    Kind of work：Joint Work  

  • Residual Stress Analysis of Multi-pass Welding Using Idealized Explicit FEM

    T. Okada, K. Ikushima, S. Itoh, M. Shibahara, S. Nishikawa

    Proceedings of International Seminar on Welding Science and Engineering & CCWS Seminar 2011, 雑誌   pp.137 - 138   2011.11

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    Kind of work：Joint Work  

  • Ultra Large Scale FE Computation Using Idealized Explicit FEM Accelerated by GPU

    K. Ikushima, S. Itoh, M. Shibahara

    Proceedings of International Seminar on Welding Science and Engineering & CCWS Seminar 2011, 雑誌   pp.139 - 140   2011.11

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    Kind of work：Joint Work  

  • Ultra Large Scale Welding Simulation

    M. Shibahara, K. Ikushima

    Proceedings of International Symposium on Disaster Simulation & Structural Safety in the Next Generation, 雑誌   pp.333 - 340   2011.09

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    Kind of work：Joint Work  

  • Fast Computational Scheme for Large-scale Transient Problem in Welding Mechanics Using Idealized Explicit FEM Reviewed

    K. Ikushima, S. Itoh, M. Shibahara

    The Proceedings of 21st International Offshore and Polar Engineering Conference, , 雑誌   Vol.4   pp.166 - 173   2011.06

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    Kind of work：Joint Work  

  • 動的陽解法FEMを基にした大規模構造物のための溶接過渡変形・応力解析手法の提案 Reviewed

    柴原 正和, 生島 一樹, 伊藤 真介, 正岡 孝治

    溶接学会論文集, , , 雑誌   Vol.29 ( No.1 )   pp.1 - 9   2011.01

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    Kind of work：Joint Work  

  • Elastic Analysis Using Inherent Strain for Large-Scale Structure by Idealized Explicit FEM

    Y. Minami, K. Ikushima, M. Shibahara, T. Fukasawa

    Advanced Maritime Engineering Conference and 4th Pan Asian Association of Maritime Engineering Societies Forum, 雑誌   pp.410 - 415   2010.12

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    Kind of work：Joint Work  

  • ステレオ画像法による三次元溶接変形計測法の開発 Reviewed

    柴原 正和, 河村 恵理, 生島 一樹, 伊藤 真介, 望月 正人, 正岡 孝治

    溶接学会論文集, , , 雑誌   Vol.28 ( No.1 )   pp.108 - 115   2010.03

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    Kind of work：Joint Work  

  • Development of analytical method for welding mechanics using Idealized Explicit FEM Reviewed

    K. Ikushima, M. Shibahara, S. Itoh, K. Masaoka

    Mathematical Modeling of Weld Phenomena 雑誌   9   pp.941 - 954   2009.09

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    Kind of work：Joint Work  

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MISC

  • スポット溶接のプロセス・力学シミュレーション

    柴原 正和, 生島 一樹

    溶接学会誌   Vol.90 ( No.3 )   pp.20 - 25   2021.04

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  • 超高速・大規模化解析による溶接変形・残留応力シミュレーション

    柴原 正和, 生島 一樹

    化学工業   Vol.71 ( No.9 )   pp.581 - 586   2020.09

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  • 溶接・接合工学の最近の動向 III溶接構造研究委員会

    望月 正人, 柴原 正和, 堤 成一郎, 三上 欣希, 生島 一樹, 岡野 成威

    溶接学会誌   Vol.89 ( No.5 )   pp.74 - 81   2020.07

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  • 溶接力学問題に対するAIの応用

    柴原 正和, 生島 一樹, 前川 真奈海

    溶接学会誌   Vol.88 ( No.7 )   pp.22 - 28   2019.10

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  • 粒子法と有限要素法を用いたFSW力学解析手法

    柴原 正和, 生島 一樹, 宮坂 史和

    溶接学会誌   Vol.88 ( No.3 )   pp.31 - 35   2019.04

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  • Study on Influence of Constraint on Hot Cracking

    MAEDA Shintaro, OKIMI Yui, ASHIDA Ryo, IKUSHIMA Kazuki, SHIBAHARA Masakazu, MA Ninshu

    Preprints of the National Meeting of JWS   2019 ( 0 )   4 - 5   2019

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  • 理想化陽解法FEMによる溶接構造物の大規模接合・組立シミュレーション

    柴原 正和, 生島 一樹

    溶接学会誌   Vol.87 ( No.6 )   pp.6 - 9   2018.09

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  • 溶接継手の強度評価手法の確立に向けた解析手法の開発

    生島 一樹

    日本溶接協会誌「溶接技術」   Vol.66 ( No.8 )   pp.126 - 127   2018.08

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  • デジタル画像相関法の溶接変形への適用

    柴原 正和, 生島 一樹

    軽金属溶接   Vol.56 ( No.5 )   pp.10 - 15   2018.05

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  • Prediction method of improved residual stress distribution by shot peening using large scale analysis method

    K. Ikushima, M. Shibahara, S. Nishikawa, T. Furukawa, K. Akita, H. Suzuki, S. Morooka

    E-Journal of Advanced Maintenance   Vol.9 ( No.3 )   2017.11

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  • ここまで来たCAE 第6回 生産・建造におけるCAE

    柴原 正和, 生島 一樹

    日本船舶海洋工学会誌「KANRIN (咸臨)」   Vol.73   pp.22 - 27   2017.07

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  • 溶接構造物の力学的諸問題の解決に向けた革新的溶接力学解析手法の構築

    生島 一樹

    日本溶接協会誌「溶接技術」   Vol.64 ( No.8 )   pp.98 - 99   2016.08

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  • 初層溶接時の溶接変形解析

    柴原 正和, 生島 一樹

    日本溶接協会誌「溶接技術」   Vol.64 ( No.3 )   pp.66 - 70   2016.02

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  • インタビュー―溶接タマゴ―

    生島 一樹

    溶接学会誌   Vol.84 ( No.6 )   pp.50 - 53   2015.09

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  • 3次元スポット溶接シミュレーションの活用

    柴原 正和, 生島 一樹

    日本溶接協会誌「溶接技術」   Vol.63 ( No.4 )   pp.112 - 117   2015.03

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  • 集まれエンジニア！「溶接変形の三次元画像計測」

    柴原 正和, 生島 一樹

    溶接学会誌   Vol.84 ( No.2 )   pp.6 - 10   2015.02

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  • 特集「最新シミュレーション技術による溶接力学の最前線」―溶接変形・残留応力のシミュレーション―

    柴原 正和, 生島 一樹

    溶接学会誌   Vol.83 ( No.7 )   pp.549 - 554   2014.09

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  • Ultra Large Scale FE Computation Using Idealized Explicit FEM Accelerated by GPU

    K. Ikushima, S. Itoh, M. Shibahara

    Transactions of JWRI   Special Issue on WSE 2011 (接合科学研究所紀要WSE2011特集号)   pp.91 - 92   2012.03

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  • Residual Stress Analysis of Multi-pass Welding Using Idealized Explicit FEM with GPU

    T. Okada, K. Ikushima, S. Itoh, M. Shibahara, S. Nishikawa

    Transactions of JWRI   Special Issue on WSE 2011 (接合科学研究所紀要WSE2011特集号)   pp.93 - 94   2012.03

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  • Development of Analytical Method for Welding Mechanics Using Idealized Explicit FEM

    M. Shibahara, K. Ikushima

    Transactions of JWRI (接合科学研究所紀要)   Vol.39 ( No.2 )   pp.384 - 386   2010.12

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Presentations

  • 溶接組立時の変形および残留応力が防撓パネルの崩壊挙動に及ぼす影響に関する検討 Domestic conference

    前田　新太郎, 辰巳 晃, 小森山 祐輔, 山内 悠暉, 柴原 正和, 生島 一樹

    日本船舶海洋工学会講演会  2024.11 

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    Presentation type：Oral presentation (general)  

  • マーカー粒子を用いたＥｕｌｅｒ型固体力学解析手法を用いたＦＳＷシミュレーション Domestic conference

    山本 航平, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • ガス炎温度と熱伝達を考慮したガス加熱解析 Domestic conference

    松岡 諒, 前田 新太郎, 夏目 糧平, 田村 光亮, 山崎 洋輔, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • AIを用いたFEM熱弾塑性解析による溶接過渡現象における変形・応力の高速予測 Domestic conference

    加藤 拓也, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • 線状加熱における多重加熱部が変形に及ぼす影響 Domestic conference

    廣瀬 天空, 山本 航平, 加藤 拓也, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • 遺伝的アルゴリズムを用いた溶接変形を低減する溶接順序に関する検討 Domestic conference

    前田 新太郎, 西原 健作, 中村 敬人, 永井 卓也, 岡部 俊明, 武田 裕之, 河原 充, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • 多層溶接における簡易力学モデルの構築 Domestic conference

    王 聞達, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • 大規模鋼構造物多層溶接時の溶接変形解析の高速化に向けた検討 Domestic conference

    永木 勇人, 山邉 晃瑠, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • 金属積層造形時における力学的挙動に及ぼす諸因子の影響に関する検討 Domestic conference

    佐々木 駿伍, 王 聞達, 手銭 永遠, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • 固有変形(固有ひずみ)を用いた弾性解析による金属積層造形時の熱変形に関する力学的検討 Domestic conference

    幅田 真史, 佐々木 駿伍, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.09 

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    Presentation type：Oral presentation (general)  

  • Shell-solid mixed analysis for efficient modeling of mechanical behavior in thin-plaste complex structure during joining International conference

    Y. Yamauchi, S. Maeda, K. Ikushima, M. Shibahara

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2024.09 

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    Presentation type：Oral presentation (general)  

  • AI-based automation of ship hull forming using AI line heating system International conference

    T. Kato, Y. Tango, A. Notsu, K. Ikushima, M. Shibahara

    The 37th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures  2024.09 

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    Presentation type：Oral presentation (general)  

  • 修正熱収縮法に基づく多層溶接継手の残留応力の予測 Domestic conference

    王 聞達, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第20回学術講演会  2024.08 

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    Presentation type：Oral presentation (general)  

  • データ同化技術を用いた溶接配管継手のクリープ損傷デジタルツインシステム Domestic conference

    山本 航平, 山内 悠暉, 生島 一樹, 柴原 正和

    日本保全学会第20回学術講演会  2024.08 

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    Presentation type：Oral presentation (general)  

  • 発電所における保全技術確立に向けた製造運用統合デジタルツインの開発 Domestic conference

    松岡 諒, 山邉 晃瑠, 峰松 伸行, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第20回学術講演会  2024.08 

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    Presentation type：Oral presentation (general)  

  • 修正熱収縮法を用いた溶接変形予測 Domestic conference

    王 聞達, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.04 

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    Presentation type：Oral presentation (general)  

  • Euler型解法を用いたFSW力学解析手法の構築 Domestic conference

    四方 皓大, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.04 

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    Presentation type：Oral presentation (general)  

  • 残留液膜を考慮した高温割れ解析 Domestic conference

    前田 新太郎, 手銭 永遠, 王 聞達, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.04 

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    Presentation type：Oral presentation (general)  

  • アルミニウム合金溶接時における面外変形に及ぼす諸因子の影響に関する検討 Domestic conference

    市川 亮大, 幅田 真史, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.04 

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    Presentation type：Oral presentation (general)  

  • 温度場・変位場を有する熱加工デジタルツインの開発 Domestic conference

    山邉 晃瑠, 松岡 諒, 前田 新太郎, 河原 充, 夏目 糧平, 田村 光亮, 山崎 洋輔, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.04 

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    Presentation type：Oral presentation (general)  

  • 大型鋼構造物を対象とした線状加熱による溶接変形の矯正シミュレーション Domestic conference

    橋場 大輔, 後藤 吉弘, 柳沢 祐介, 田名辺 義光, 本間 祐太, 山内 悠暉, 生島 一樹, 柴原 正和

    溶接学会全国大会  2024.04 

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    Presentation type：Oral presentation (general)  

  • AI-based optimization of welding sequence in multi-pass welding International conference

    S. Hirose, H. Hashizume, T. Kato, K. Ikushima, M. Shibahara

    9th International Conference on Welding Science and Engineering  2023.07 

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    Presentation type：Oral presentation (general)  

  • Development of digital twin for structures with thermal-elastic-plastic field International conference

    R. Matsuoka, N. Minematsu, S. Maeda, K. Ikushima, M. Shibahara

    9th International Conference on Welding Science and Engineering  2023.07 

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    Presentation type：Oral presentation (general)  

  • Effect of load changing on creep-fatigue life of pipe joints International conference

    Y. Kitani, K. Ikushima, M. Arai, H. Nishida, M. Shibahara

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation  2022.11 

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    Presentation type：Poster presentation  

  • Study on application of efficient FE modeling technique in analysis of welding mechanics International conference

    Z. Li, S. Maeda, K. Ikushima, M. Shibahara

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation  2022.11 

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    Presentation type：Poster presentation  

  • Creep analysis of large-scale weld pipe structure in thermal power plant International conference

    Y. Kitani, Y. Yamauchi, K. Ikushima, H. Nishida, N. Ma, M. Shibahara

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation  2022.11 

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    Presentation type：Oral presentation (general)  

  • Shell-solid coupling analysis of mechanical behavior in complex thin-plate structure during welding International conference

    Z. Li, S. Maeda, K. Ikushima, M. Shibahara

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation  2022.11 

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    Presentation type：Oral presentation (general)  

  • Mechanical study of Trans-Varestraint Test by Using Numerical Analysis of Hot Cracking Based on Idealized Explicit FEM International conference

    S. Maeda, W. Wang, M. Habata, K. Ikushima, M. Shibahara

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation  2022.11 

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    Presentation type：Oral presentation (general)  

  • 船舶部材における最適溶接順序に関する検討 Domestic conference

    前田 新太郎, 李 志浩, 廣瀬 天空, 中村 敬人, 西原 健作, 永井 卓也, 岡部 俊明, 武田 裕之, 河原 充, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 機械学習を用いたすみ肉溶接時に発生する固有変形の簡易予測手法に関する検討 Domestic conference

    廣瀬 天空, 加藤 拓也, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • パイプ溶接構造物におけるクリープ変形のデジタルツインに関する検討 Domestic conference

    山内 悠暉, 松岡 諒, 木谷 悠二, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • データ同化技術を用いた溶接配管継手のクリープ損傷デジタルツインシステム Domestic conference

    木谷 悠二, 麻 寧緒, 西田 秀高, 山内 悠暉, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 終端割れを防止するタブ板形状に関する検討 Domestic conference

    兼本 拳多, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • クレータ割れ発生に関する力学的検討 Domestic conference

    前田 新太郎, 幅田 真史, 王 聞達, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 修正熱収縮法の提案と溶接力学問題への適用 Domestic conference

    幅田 真史, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • ガス加熱時の入熱分布推定に関する検討 Domestic conference

    松岡 諒, 峰松 信行, 前田 新太郎, 河原 充, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 残留応力の高速予測サロゲートモデルの開発とその応用 Domestic conference

    加藤 拓也, 廣瀬 天空, 丹後 義彦, 駒田 周治, 山内 悠暉, 野津 亮, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 開先開口挙動に注目した高温割れ防止法に関する検討 Domestic conference

    織田 祐輔, 王 聞達, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • バレストレイン試験に関する数値解析的検討 Domestic conference

    王 聞達, 幅田 真史, 前田 新太郎, 生島 一樹, 森 裕章, 柴原 正和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 摩擦攪拌接合時のツールの形状の影響に関する数値解析的検討 Domestic conference

    九鬼 正治, 山内 悠暉, 生島 一樹, 柴原 正和, 宮坂 史和

    溶接学会全国大会  2022.09 

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    Presentation type：Oral presentation (general)  

  • 局部PWHT を用いた溶接残留応力低減法とその予測 Domestic conference

    田中 亮匡, 川瀬 充弘, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第18回学術講演会  2022.07 

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    Presentation type：Oral presentation (general)  

  • 修正熱収縮法による溶接残留応力簡易予測法の開発 Domestic conference

    幅田 真史, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第18回学術講演会  2022.07 

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    Presentation type：Oral presentation (general)  

  • 溶接高温割れ問題に対するAI 強化学習の応用 Domestic conference

    廣瀬 天空, 加藤 拓也, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第18回学術講演会  2022.07 

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    Presentation type：Oral presentation (general)  

  • クリープ疲労余寿命推定のデジタルツイン Domestic conference

    松岡 諒, 高橋 陸, 山内 悠暉, 西田 秀高, 荒井 正行, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第18回学術講演会  2022.07 

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    Presentation type：Oral presentation (general)  

  • 溶接構造物の保全に向けたデジタルツイン技術による高温物理定数推定 Domestic conference

    山内 悠暉, 松岡 諒, 木谷 悠二, 前田 新太郎, 生島 一樹, 柴原 正和

    日本保全学会第18回学術講演会  2022.07 

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    Presentation type：Oral presentation (general)  

  • 2.25Cr-1Mo-V 鋼の溶接残留応力に及ぼす変態塑性の影響 Domestic conference

    橋場 大輔, 落合 朋之, 本間 祐太, 生島 一樹, 河原 充, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • 遺伝的アルゴリズムを用いた凝固割れ防止タブ板形状に関する検討 Domestic conference

    前田 新太郎, 三ッ井 佑太, 王 聞達, 加藤 拓也, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • 熱収縮法を用いた溶接力学解析 - 修正熱収縮法の提案- Domestic conference

    手銭 永遠, 安田 匠吾, 加藤 拓也, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • 機械学習を用いたガス加熱時に発生する固有ひずみの簡易予測手法に関する検討 Domestic conference

    加藤 拓也, 山内 悠暉, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • デジタルツインによる溶接時における力学状態の推定に関する検討 Domestic conference

    山内 悠暉, 高橋 陸, 木谷 悠二, Ramy Gadallah, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • 溶接高温割れ試験法に関する数値解析的検討 Domestic conference

    王 聞達, 兼本 拳多, 前田 新太郎, 生島 一 樹, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • レーザ・アークハイブリッド溶接時における凝固割れ発生に及ぼす諸因子の影響 Domestic conference

    兼本 拳多, 王 聞達, 河原 充, 前田 新太郎, 生島 一樹, 柴原 正和

    溶接学会全国大会  2022.04 

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    Presentation type：Oral presentation (general)  

  • Nonlinear mechanical FE analysis of thin-plate complex structures using the shell-solid mixed method International conference

    K. Ikushima

    39th International Conference on Ocean Offshore and Arctic Engineering   2020.08 

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    Presentation type：Oral presentation (general)  

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Outline of collaborative research (seeds)

  • 構造物の非線形力学現象の解析

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    有限要素法(FEM)を用いて構造物で問題となる非線形力学問題について解析する。
    座屈や塑性変形、溶接変形、残留応力などの検討が可能。

  • Large-scale non-linear finite element analysis

Grant-in-Aid for Scientific Research

  • Four-Dimensional Visualization of Thermal Processing in Ship Hull Fabrication and Establishment of Crack Prevention Using Digital Twins

    Grant-in-Aid for Scientific Research(B)  2026

  • Development of an innovative prediction method for predicting mechanical behavior during metal additive manufacturing

    Grant-in-Aid for Challenging Research (Exploratory)  2026

  • Evaluation of uncertainty in ship structural collapse behavior and risk at time of damage using construction and strength-linked analysis

    Grant-in-Aid for Scientific Research(B)  2026

  • Four-Dimensional Visualization of Thermal Processing in Ship Hull Fabrication and Establishment of Crack Prevention Using Digital Twins

    Grant-in-Aid for Scientific Research(B)  2025

  • Development of an innovative prediction method for predicting mechanical behavior during metal additive manufacturing

    Grant-in-Aid for Challenging Research (Exploratory)  2025

  • Evaluation of uncertainty in ship structural collapse behavior and risk at time of damage using construction and strength-linked analysis

    Grant-in-Aid for Scientific Research(B)  2025

  • Four-Dimensional Visualization of Thermal Processing in Ship Hull Fabrication and Establishment of Crack Prevention Using Digital Twins

    Grant-in-Aid for Scientific Research(B)  2024

  • Development of an innovative prediction method for predicting mechanical behavior during metal additive manufacturing

    Grant-in-Aid for Challenging Research (Exploratory)  2024

  • Evaluation of uncertainty in ship structural collapse behavior and risk at time of damage using construction and strength-linked analysis

    Grant-in-Aid for Scientific Research(B)  2024

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Charge of on-campus class subject

  • 海洋プログラミング演習

    2025   Weekly class   Undergraduate

  • 海洋システム工学総合演習

    2025   Weekly class   Undergraduate

  • 海洋システム工学卒業研究B

    2025   Intensive lecture   Undergraduate

  • 船舶海洋工学プロジェクト3

    2025   Weekly class   Undergraduate

  • プログラミング入門A

    2025   Weekly class   Undergraduate

  • 航空宇宙海洋系特別研究

    2025   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別演習第2

    2025   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別研究第2

    2025   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別演習

    2025   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別演習第1

    2025   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別研究第1

    2025   Intensive lecture   Graduate school

  • 船舶海洋構造工学特論1

    2025   Weekly class   Graduate school

  • 海洋システム機械工作実習

    2025   Weekly class   Undergraduate

  • 海洋システム工学実験

    2025   Weekly class   Undergraduate

  • 海洋システム工学卒業研究A

    2025   Intensive lecture   Undergraduate

  • 海洋システム工学概論

    2025   Weekly class   Undergraduate

  • 船舶海洋工学プロジェクト2

    2025   Weekly class   Undergraduate

  • 船舶海洋構造力学1

    2025   Weekly class   Undergraduate

  • プログラミング入門A

    2024   Weekly class   Graduate school

  • 航空宇宙海洋系特別研究

    2024   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別演習第2

    2024   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別研究第2

    2024   Intensive lecture   Graduate school

  • 海洋プログラミング演習

    2024   Weekly class   Undergraduate

  • 海洋システム工学総合演習

    2024   Weekly class   Undergraduate

  • 船舶海洋工学プロジェクト3

    2024   Weekly class   Undergraduate

  • 海洋システム工学基礎演習

    2024   Weekly class   Undergraduate

  • 航空宇宙海洋系特別演習

    2024   Intensive lecture   Graduate school

  • 初年次ゼミナール

    2024   Weekly class   Graduate school

  • 航空宇宙海洋系特別演習第1

    2024   Intensive lecture   Graduate school

  • 航空宇宙海洋系特別研究第1

    2024   Intensive lecture   Graduate school

  • 船舶海洋構造工学特論1

    2024   Weekly class   Graduate school

  • 海洋システム機械工作実習

    2024   Weekly class   Undergraduate

  • 海洋システム工学実験

    2024   Weekly class   Undergraduate

  • 海洋システム工学概論

    2024   Weekly class   Undergraduate

  • 船舶海洋工学プロジェクト2

    2024   Weekly class   Undergraduate

  • 船舶海洋構造力学1

    2024   Weekly class   Undergraduate

  • Introduction to Mechanical, Aerospace and Marine-System EngineeringI

    2021    

  • Manufacturing Process Laboratory

    2021   Practical Training  

  • Total Exercises: Marine System Engineering

    2021    

  • Fundamental Exercises: Marine System Engineering

    2021    

  • Project Exercises: Marine System Engineering II

    2021    

  • Project Exercises: Marine System Engineering I

    2021    

  • Structural Mechanics I

    2021    

  • Advanced theory in ship structural design

    2021    

  • Laboratory: Marine System Engineering

    2021   Practical Training  

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