The prediction of the dynamic responses of ceramic particle reinforced MMCs by using multi-particle computational micro-mechanical method

The computational micro-mechanical method is used to analyze the dynamic mechanical properties of ceramic particle reinforced MMCs in this paper. The ceramic particles are simulated as circles with different diameters, which are randomly and discontinuously embedded in the matrix. Both the Johnson–Holmquist damage model and the elastic model are used to characterize the constitutive behavior of the ceramic material. The results calculated by the two models are compared with each other and also with those of experiments. It is shown that the flow stresses predicted by the Johnson–Holmquist model are in good agreement with those of experiments, while those predicted by the elastic model are higher than those of experiments. The influences of particles’ volume fraction and overall strain rates on the dynamic behavior of the composites are studied. The damage of the particles is considered and it is only found in the composites with high particles’ volume fraction. The damage of the particles can reduce the flow stresses of the composites.