文献类型：期刊文献

中文题名：描述低周疲劳裂纹扩展速率的循环J积分新参量

英文题名：New Cyclic J-Integral for Low-Cycle Fatigue Crack Growth

作者：胡宏玖[1];郭兴明[1];李培宁[2];谢禹钧[2];李洁[1]

机构：[1]上海大学上海市应用数学和力学研究所,上海200072;[2]华东理工大学机械工程学院,上海200237

年份：2006

卷号：27

期号：2

起止页码：134

中文期刊名：应用数学和力学

外文期刊名：Applied Mathematics and Mechanics

收录：CSTPCD;;EI(收录号：2006209881902);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：上海市重点学科建设资助项目(Y0103)

语种：中文

中文关键词：循环J积分;低周疲劳;本构关系;数值计算;疲劳迟滞

外文关键词：cyclic J-integral;low-cycle fatigue; constitutive equation; numerical evaluation; fatigue retardation

摘要：探讨了低周疲劳加载条件下的应力增量_应变增量关系,提出了模拟裂纹疲劳扩展的二维模型以建立新的循环J积分参量,详细阐述了该积分参量的定义、主要特点、物理意义以及数值计算方法,并通过紧凑拉伸试样的疲劳试验检验该积分参量的有效性.结果表明:该积分参量能够较好描述恒幅低周疲劳裂纹的扩展速率.此外,基于积分参量体系,从能量的角度解释了疲劳迟滞现象.
The constitutive equation under low-cycle fatigue （LCF） was discussed, and a two-dimensional （2-D） model for simulating fatigue crack extension was put forward in order to propose a new cyclic J-integral. The definition, primary characteristics, physical interpretations and numerical evaluation of the new parameter were investigated in detail. Moreover, the new cyclic J-integral for LCF behaviors was validated by the compact tension （CT） specimens, results show that the calculated values of new parameter can correlate well with LCF crack growth rate,during constant-amplitude loading. In addition, the phenomenon of fatigue retardation was explained through the viewpoint of energy based on the concept of new parameter.