Numerical Simulations of the Dynamic Compressive Properties of Ceramic Particle Reinforced Metal Matrix Composites

摘要

A multi-particle 2D plane strain model was used to investigate the dynamic compressive properties of ceramic particle reinforced metal matrix composites (MMCs) in this paper. Ceramic particles were simulated as circles with different diameters, which were randomly and discretely embedded in the matrix. The constitutive relationship of ceramic material was characterized by Johnson-Holmquist (JH-2) damage model. The matrix was assumed to be power-law strain hardening material, coupled with power-law strain rate hardening. The ceramic/metal interface was assumed to be perfect. The predicted stress-strain curves by the numerical models agreed well with those of experiments and unit cell analysis formulae developed by Bao and Lin [3]. The effects of overall strain rates and ceramic volume fraction on the dynamic behavior of the composites had been investigated by this numerical model. The effect of particles' distribution on the particles' damage was also discussed. The results show that the distribution and volume fraction of the particles have obvious effect on the particles' damage.