功能梯度形状记忆合金材料的热力学行为

Thermodynamic Behaviors of Functionally Graded Shape Memory Alloy Actuator

功能梯度形状记忆合金(Functionally graded shape memory alloy,FG-SMA)兼备功能梯度材料和形状记忆材料的双重特性,近年来已经引起科学界的广泛关注。本文根据复合材料力学理论,对功能梯度形状记忆合金复合材料层合板的本构关系进行研究,讨论了变温作用下不同铺层中嵌入形状记忆合金(Shape memory alloy,SMA)夹杂的功能梯度SMA复合材料层合板的热力学行为。数值结果与已有文献报导的研究结果基本一致,且本文研究表明:SMA夹杂嵌入在不同铺层中以及具有不同体积分数的情况下材料展示了不同的热力学行为。

A composite laminate embedded with the functionally graded shape memory alloy( FG-SMA) actuators is theoretically investigated. The constitutive models of the FG-SMA composite including the single layer SMA composite,multilayer SMA composite with the same volume fraction of the SMA,are first built. And then an example using such model is discussed on a published SMA hybrid composite under thermo loading to prove the validity of the theoretical work. Finally,the thermomechanic behaviors of the FG-SMA composite with different embedded layers and different volume fractions of the SMA are obtained.