The process and rules of the initial cracking due to thermal fatigue are studied considering the multi-linear kinematic hardening of material,with a simple sample as model analyzed by FEM.

• 用有限元方法并考虑材料的多线性随动强化性质对带有裂纹的简单试件模型进行热疲劳分析,研究热疲劳裂纹张开的过程和规律。