Numerical simulation of fatigue crack growth in steel structures

钢结构疲劳裂纹扩展的数值模拟

• 批准号: 13450410
• 负责人: TOYOSADA Masahiro
• 金额: $ 9.15万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450410/
• 关键词: Fatigue; S-N curves; Fatigue crack growth curves; In-service loading; Numerical simulation of crack growth; Corrosion fatigue; Estimation of the stress distribution alone plate thickness direction; Fatigue crack initiation; 疲労き裂; 大型溶接構造物; 疲労寿命 /

In order to recover the insufficient ability of S-N curves for the evaluation of fatigue strength in the welded built-up steel structures, e.g.ship, offshore structures and bridges, a new fatigue strength evaluation procedure based on the numerical simulation of the, fatigue crack growth(initiation and propagation) is developed by this research project.Detailed project items are as follows1.An algorithm to perform the numerical simulation of the fatigue crack growth is proposed.2.An numerical model for the fatigue crack initiation from the sound(zero defect) stress concentration field is constructed by considering the dislocation theory.3.Some numerical simulations are performed and the results are compared with the experimental results in order to verify the algorithm.4.An algorithm for the corrosion fatigue is proposed.5.The conventional estimation method of stress distributions in the plate thickness is proposed.Calculation results of the FE analysis by shell type element is the input data of this method.

为了弥补S-N曲线对船舶、海洋结构、桥梁等焊接组合钢结构疲劳强度评定能力的不足，提出了一种新的基于数值模拟的疲劳强度评定方法。提出了疲劳裂纹扩展(萌生和扩展)的数值模拟算法。2.考虑位错理论，建立了基于声(零缺陷)应力集中场的疲劳裂纹萌生数值模型。3.进行了数值模拟，并与实验结果进行了比较，验证了算法的正确性。4.提出了腐蚀疲劳的计算方法。5.提出了板厚应力分布的常规估算方法。有限元计算结果表明，该方法是可行的壳型单元分析是该方法的输入数据。

项目成果

M.Toyosada, K.Gotoh: "The Significance of Plastic Zone Growth under Cyclic Loading and Crack Opening/Closing Model in Fatigue Crack Propagation"Proceedings of MSMF-4. (印刷中). (2004)

M.Toyosada、K.Gotoh：“疲劳裂纹扩展中循环载荷和裂纹张开/闭合模型下塑性区增长的意义”MSMF-4 论文集（2004 年）。

K.Gotoh, K.Konuma, M.Toyosada: "Fatigue Crack Growth Simulation from the Stress Concentration Region with Zero Defect"Proceedings of Japan Society of Civil Engineering, Kyushu Chapter annual meeting. A144-A145. (2003)

K.Gotoh、K.Konuma、M.Toyosada：“零缺陷应力集中区域的疲劳裂纹扩展模拟”日本土木工程学会九州分会年会论文集。

M.Toyosada, T.Niwa, H.Matsuda: "Growth Process and Assessment of Fatigue Life for Surface Cracks Emanated from Stress Concentration Field"Journal of the Society of Naval Architects of Japan. Vol.190. 517-530 (2001)

M.Toyosada、T.Niwa、H.Matsuda：“应力集中场产生的表面裂纹的生长过程和疲劳寿命评估”日本造船学会杂志。

M.Toyosada, K.Gotoh, K.Konuma, A.Sueda: "The Fatigue Life Estimation Method from the Stress Concentration Region with Zero Defect"Proceedings of OMAE'04, Vancouver, Canada. (in press). (2004)

M.Toyosada、K.Gotoh、K.Konuma、A.Sueda：“零缺陷应力集中区域的疲劳寿命估计方法”OMAE04 会议记录，加拿大温哥华。

M.Toyosada, K.Gotoh: "Investigation of Enhancement of Fatigue Strength for Welded Built-up Structures by Flame Line Heating"Proceedings of ICES 2002,Rino, USA. (2002)

M.Toyosada、K.Gotoh：“通过火焰线加热提高焊接组合结构疲劳强度的研究”ICES 2002 会议论文集，Rino，美国。