裂纹尖端弹塑性与氢扩散耦合分析  

Coupling Analysis of Elastoplastic-diffusion and Hydrogen Transport near Blunt Crack Tip

作　　者：吴晓金[1] 王家序[1] 金山宽[2] 肖科[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030 [2]九州大学智能机械专攻计算力学研究室

出　　处：《农业机械学报》2010年第6期193-198,221,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50735008);国家留学基金资助项目(留金出[2008]3019号)

摘　　要：提出描述钝性裂纹尖端氢扩散现象的数学模型,将结构分析和氢扩散分析的结果进行耦合计算,运用有限元方法揭示静水压力、塑性变形与氢扩散的关系,研究塑性变形与氢在裂纹尖端区域协同作用的影响规律。结合氢扩散分析结果,用有限元方法评价材料的大变形弹塑性行为,考虑局部流动应力的氢效应,用有限元分析解决钝性裂缝尖端的平衡氢分布和大应变弹塑性边界值的耦合问题。A mathematical model which described the hydrogen diffusivity near blunt crack tip was proposed.Coupled calculation model for structure and hydrogen diffusion analysis were put forward.Using finite element,the relations between hydrostatic pressure,plastic deformation and hydrogen diffusion were revealed.The synergy influence rules of plastic deformation and hydrogen near the crack tip were analyzed.Finite element method was used to evaluate the large deformation elasto-plastic behavior of the material with the hydrogen diffusion analysis results.Finite element analysis was employed to solve the coupled boundary-value problem of large strain elasto-plasticity and equilibrium hydrogen distributions near blunt crack tip by taking into consideration the effect of hydrogen on local flow stress.

关 键 词：氢脆 氢致裂纹 耦合分析 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] TB301[自动化与计算机技术—计算机科学与技术]