【摘要】 针对NiTi形状记忆合金的马氏体不完全逆转变带来的回复应力模型预测误差,开展了NiTi形状记忆合金一维回复应力-温度模型研究。在Brinson的形状记忆合金(SMA)一维本构模型基础上,增加马氏体回复因子为内变量,给出了马氏体回复因子与预应变的关系,综合考虑温度和应力对马氏体体积分数的影响,构造NiTi形状记忆合金回复应力-温度改进模型,通过实验测试了不同预应变量的NiTi合金回复应力与温度关系曲线。研究表明:本研究提出的改进模型预测的NiTi形状记忆合金回复应力-温度曲线,与实验曲线吻合较好。更多还原

【Abstract】 To eliminate the prediction errors of the recovery stress model of Ni Ti SMAs caused by the incomplete reverse martensitic transformation, an improved prediction model of recovery stress was developed based on the one-dimensional constitutive behavior model proposed by Brinson for shape memory alloys(SMAs). This model regarded the martensitic recovery factor as an internal variable and took the stress and temperature into account as influencing factors to martensitic content of SMAs. The curve of recovery stress of Ni Ti SMAs with different initial strains versus temperature was measured by experiments. Compared with the experimental results, the computation result shows that the model has certain accuracy in calculating the recovery stress-temperature curve.更多还原