By choosing the dissipation energy as the damage variable, corresponding damage evolution equations are established, respectively, for the mechanical cyclic loading part and the thermal one during the thermo-mechanical cyclic loading of NiTi shape memory alloys (SMAs) involving one-way shape memory effect (simply denoted as the OWSME cycling). And then, the evolution law of total damage is obtained by a superposition of such two damage parts. Finally, the uniaxial OWSME fatigue lives of NiTi SMA micro-tubes are predicted by combining the proposed damage model with an adopted failure criterion. The results show that all the predicted fatigue lives are located within the twice scatter band with regard to the experimental ones, and most of them are located within a scatter band of 1.5 times. It is indicated that the predicted OWSME fatigue lives are in good agreement with the experimental ones.

通过选择耗散能作为损伤变量，分别建立了涉及单向形状记忆的NiTi形状记忆合金（SMA）热机械循环加载过程中机械循环加载部分和热部分的相应损伤演化方程效应（简称为 OWSME 循环）。然后，将这两个损伤部分叠加，得到总损伤的演化规律。最后，通过将提出的损伤模型与采用的失效准则相结合，预测了 NiTi SMA 微管的单轴 OWSME 疲劳寿命。结果表明，所有预测的疲劳寿命相对于实验都位于两倍散射带内，其中大部分位于1.5倍散射带内。