The first stage is primary slip then followed by secondary slip ; the last stage is due to dislocation passing the slips . the cyclic stress strain ( css ) curve exhibits a stronger hardening occurred in cyclic plastic deformation than that in tensile test 建立了拉伸和应变疲劳的有限元模型，使用基于晶体滑移模型的数值方法，对晶体内部滑移系的启动以及滑移系上的分解切应变、切应力这些无法试验观测的变量进行计算，分析它们对晶体塑性变形的不同影响。
