复杂荷载下疲劳的非比例硬化数值模拟  

Numerical Simulation of Fatigue Nonproportional Hardening Rule under Nonproportional Load

作　　者：姜晓妍[1] 冯淼林[1] 吴长春[1] 

机构地区：[1]上海交通大学工程力学系,上海200240

出　　处：《力学季刊》2008年第3期462-467,共6页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(10772115);国家自然科学海外杰出青年基金(50428504);教育部归国留学人员基金的资助

摘　　要：许多统计资料表明,在所有的力学破坏中,由交变载荷作用引起的疲劳断裂破坏,占50%～90%。复杂荷载下(多数为非比例荷载)引起的疲劳响应是当前疲劳实验、理论和数值分析所关注的问题之一,也相继出现了很多描述非比例硬化的实验、理论和模型。本文应用Jiang-Sehitoglu疲劳塑性模型,引用了一系列材料参数,考虑屈服面大小的变化,在非比例加载条件下考虑到材料的非比例硬化,对具有典型非比例硬化材料-304不锈钢的疲劳本构进行了数值模拟,得到的结果和试验结果比较,可以看出具有很好的吻合性。All failures, about 50 % to 90 % is due to cyclic load and fatigue damage from lots of literatures. Fatigue response due to complicated load （much are nonproportional load） is the subject of fatigue experimental, theoretical and analytical investigations. Critical experiments, theories and models of comparison to quantify nonproportional hardening were presented. By using Jiang＇s constitutive model, a new kine- matic hardening equation was used. The non-proportionality, and the effect of memorization for the maximum plastic strain amplitude were considered. It is shown from the simulated result that the model can describe the non-proportional multiaxial deformation behavior and cyclic hardening behavior. Then, we use a 304 stainless steel and Jiang＇s model under nonproportional load to do numerical calculation. It is concluded that the results is almost the same with the experiments.

关 键 词：非比例加载 非比例硬化 304不锈钢 疲劳本构 

分 类 号：O346.2[理学—固体力学]