二相粒子复合陶瓷内应力的有限元分析及其增韧机理

FEM Analysis of internal Stress of Composite Ceramics and Its Toughness Mechanism

本文建立了二相粒子复合陶瓷的有限元模型，分析了模型内部的应力分布状况，并总结了二相粒子体积比Vp变化时的应力分布的变化规律，讨论了颗粒热膨胀系数αp与基体热膨胀系数αm的匹配关系变化时，复合陶瓷内的应力分布状况，在此基础上，对二相粒子复合陶瓷的增韧机理做了探讨．

A plane finite element model was established for two-phase ceramics. The residllal stressdistribution in the model was analyzed, and the variation regularity of internal stress along withthe second phase particle's volumetric proporation was given. The effect to residual stress was alsodiscussed, which is caused by the variation of relation between the thermal expansion coefficientsof the matrices and the second phase particles, the difference between interface stress of theoreticalvalue and calculated one was discussed, and some viewpoints of toughness enhanced mechanismfor this composite material were concluded.