Finite element analysis of compressive behavior of hybrid short fiber/particle/mg metal matrix composites using RVE model

摘要

The compressive behavior of hybrid short fiber/particle composites was examined by using finite element analysis and representative volume element models for two different particle shapes. The realistic, random and complex distributions of the short fibers and particles were reconstructed to produce a representative volume element of the hybrid composites using a random sequential adsorption algorithm. The predicted mechanical properties and overall compressive stress-strain by finite element analysis corresponded well to the experimental results at the elastic region and near the yield surface, but the model slightly overestimated the strength of the composites at higher stress. This deviation possibly occurs from micro-mechanical factors, which were not considered in the RVE models. In contrast to FE analysis, fracture of the short fiber and fiber-matrix debonding occurred because of large localized stress. In the case of a high applied load, non-linear behavior of reinforcements and interfacial strength should be considered to obtain accurate results. Meanwhile, mechanical properties of rectangular particles are more effective on the hybrid composites the spherical ones for the hybrid composites.