中文摘要：

针对316L奥氏体不锈钢进行了一系列非比例载荷下应变控制低周疲劳试验．采用ANSYS软件进行模拟计算，材料弹塑性特性采用多线性随动硬化模型和vonMises屈服准则，分别采用单轴循环应力应变曲线和圆路径循环应力应变曲线来描述材料属性．在柱坐标系下进行分析，一端固定，另一端施加轴向及周向位移来实现拉扭应变加载．模拟结果表明：针对单轴路径模拟得到的应力与试验值相差仅为3．6％，扭转路径下差值为5．1％；而在比例路径和阶梯路径下，模拟得到正应力和剪应力与试验值的差约为12％及14％；虽然采用圆路径下循环应力应变关系表征材料属性，但该路径下最大应力误差达到了近12．9％及14．2％．

英文摘要：

A series of tests for low cycle fatigue are conducted for 316L stainless steel under multiaxial loading at room temperature. Multilinear kinematic hardening rule and von Mises yield criterion are used to describe the elastic-plastic behavior of material using ANSYS software. Material behavior is indicated by uniaxial and circular cyclic stress strain curve. One end is fixed and another is subjected to the axial and circumferential displacement in the cylindrical coordinate. Simulations show that the stress deviation between the simulations and test results is 3.6 % under uniaxial loading, 5. 1% for torsional loading. However under proportional and stair loading, the normal stress and shear stress deviation are almost 12 % and 14 %. The maximum deviation of the normal stress and shear stress under circular loading are nearly 12.9 % and 14. 2 % ,even if the cyclic stress strain curve under circular path is employed.