颗粒增强脆性基复合材料的尺寸效应

Effect of Particles Dimension on Failure Process of Brittle Composite Matrix with Particles Reinforcement

在材料细观非均匀性的基础上研究了含粒径不同颗粒的脆性基复合材料的宏观力学性质和破坏过程的尺寸效应。采用材料破坏过程分析数值模拟软件,对多颗粒增强脆性基复合材料在单轴拉伸荷载作用下经变形、损伤直至破坏的全过程进行模拟研究。结果表明当脆性基体分别复合体积分数相同而大小不同的柔性颗粒时复合材料具有不同的破坏机制,颗粒的尺寸会显著影响材料的破坏及失稳方式,材料的宏观强度随颗粒粒径的增加而降低;但颗粒的尺寸对复合材料线弹性阶段的刚度却影响甚微。

A numerical program developed based on me.so-damage mechanics, was adopted to simulate the deformation, damage and fracture, i.e. the whole failure process of brittle composite matrix reinforced by particles under uniaxial tensile load. The effect of particles size was consequently investigated in this paper. From the simulation, one can concluded that different particles size could cause different failure mechanism and therefore, had profound effect on the failure mode, strength, but had less effect on the Young＇s modulus of the composites.