假设NiTi单晶在相变过程中具有层状的微观结构及理想的界面连续条件,推导出各相微观量与宏观量之间的关系,及相变驱动力的表达式,建立了单晶相变的控制方程,从而得到单晶的本构模型.以此为基础,利用Tayloy假设,建立了NiTi多晶的本构模型.通过控制应变进行加载,数值模拟了恒温条件下具有{111}织构的NiTi合金的力学响应,得到的应力-应变曲线与实验结果吻合较好.利用模拟结果讨论了拉伸与压缩的不对称性、软化和温度对NiTi合金变形的影响.
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