颗粒形状对陶瓷基复合材料有效力学性能的影响分析

Analysis of Influence for Particles with Different Shapes on the Effective Mechanical Properties of Ceramic Matrix Composites

在ANSYS平台上建立不同形状随机颗粒增强陶瓷基复合材料的有限元模型,以二维和三维模型为例,利用不同的方法对复合材料的有效弹性模量和有效热膨胀系数进行预测,并比较各方法的异同。结果表明:有效弹性模量随颗粒体积比的增加而增加,有效热膨胀系数随颗粒体积比的增加而减小;不同形状之间有效力学性能存在一定差别:均质化法能较准确地预测复合材料的有效力学性能。

The finite element model of ceramic matrix composites reinforced with random particles for different shapes are established on the platform of ANSYS. Taking the two and three--dimensional models as the example, effective elastic modulus and effective thermal expansion coefficient of composites are predicted by using different methods. The results show that the effective elastic modulus increases with the volume fraction of particles increases and the effective thermal ex- pansion coefficient decreases with the increase of volume fraction of particles; effective mechanical properties are different between different shapes, and the homogenization method is effective to predict the effective mechanical properties of ceramic composites.