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形状记忆合金是由马氏体和奥氏体组成并动态变化的两相材料 ,其拟弹性行为实质上是两相各自行为的动态组合。本文提出了形状记忆合金拟弹性行为的一种热力学描述。根据实验现象假设在感兴趣的温度和变形范围内 ,奥氏体相具有线弹性特性而马氏体相具有弹塑性特性 ,结合 Tanaka的相变描述 ,给出了小变形、初始各向同性和塑性不可压缩条件下形状记忆合金的三维本构方程。对不同温度下形状记忆合金材料的特性进行了描述 ,较好地预言了单调及循环加载下的响应和正、反相变行为及其温度影响 ,动态相变过程对应力响应的影响 ,高温相下的强度增加等。
Shape memory alloys are two-phase materials composed of martensite and austenite, and their quasi- elastic behavior is essentially the dynamic combination of their respective behaviors. This paper presents a thermodynamic description of the pseudo-elastic behavior of shape memory alloys. According to the experimental phenomena, it is assumed that the austenite phase has the linear elastic characteristic and the martensite phase has the elastic-plastic characteristic within the temperature range of interest and the deformation range. According to the Tanaka phase transformation description, the small deformation, initial isotropy and THREE DIMENSIONAL CONSTITUTIVE EQUATION OF SHAPE MEMORY ALLOY UNDER PLASTIC INTRINSIC CONDITION. The properties of shape memory alloy materials at different temperatures are described, and the effects of monotonous and cyclic loading on response and positive and negative phase transition behavior and their temperature influence, dynamic phase transition process on stress response are well predicted. Increase in intensity and so on.