SMA短纤维复合材料的热胀系数和相变应变系数

基于Eshelby的等效夹杂模型、Mori和Tanaka的场平均法，考虑到形状记忆合金（SMA）的强物理非线性，发展了增量型的等效夹杂模型（Incremental Equivalent Inclusion Model)。讨论了SMA短纤维增强的铝基复合材料的热胀系数和相变应变系数。特别研究了SMA短纤维复合材料纤维几何尺寸和体积分数等参数对SMA复合材料的热胀系数和相变应变系数的影响。这些工作对于指导材料设计和了解SMA复合材料热机械特性是非常有意义的。

THERMAL EXPANSION COEFFICIENT AND TRANSFORMATION STRAIN COEFFICIENT OF COMPOSITES REINFORCED BY SMA SHORT FIBERS

The incremental equivalent inclusion model is proposed on the basis of the Eshelby inclusion method and Mori Tanaka method to investigate the effective thermal expansion coefficient and transformation strain coefficient of composites with SMA short fiber reinforcer. The attentions are paid to study the effects of fiber geometric, volume ratio of fiber in composite on the effective thermal expansion coefficient and transformation strain coefficient of composite. The results show that both the fiber geometric and the volume ratio of fiber have strong influences on these effective parameters of composites, and people can achieve the advanced design by adjusting the fiber geometric and fiber volume ration in composites. The conclusions obtained are helpful for understanding the thermomechanical behavior of SMA composites and can be used to direct the design of SMA composites.