考虑夹杂间相互影响的颗粒增强两相复合材料等效热膨胀系数预测

摘要

基于热-机械载荷联合作用下两相颗粒复合材料的热力学响应特性,推导得到了材料的宏观等效热膨胀系数,给出的表达式中完全考虑了夹杂之间的相互影响,因此适用于大体积分数的复合材料体系.此外,还给出了在热-机械载荷联合作用下代表性体积单元(Representative volume element,RVE)、夹杂和基体中体积均匀化应力场和应变场的具体分布形式.本文的预测结果与已有的实验数据吻合很好,说明了该模型的有效性.%The effective coefficient of thermal expansion is delivered based on the thermo-mechanical responses of two-phase particle-reinforced composites. The explicit expression with pair-wise particle interactions is suitable for composites with high particle volume fraction. Furthermore, the volume-averaged thermo-elastic stress/strain fields of representative volume element (RVE), reinforced-particles and matrix are also presented. The validity of the model is exhibited through the excellent coincidence with related experiment data.