Abstract：The equivalent elastic constant is one of the important indicators to characterize the mechanical properties of materials. To study the influence of the interface on the overall mechanical properties of the particle-reinforced composites, the Voronoi element finite element method containing the interface phase is used in this paper. According to the generalized Hooke’s law, we calculated the equivalent elastic constant of particle-reinforced composites under certain boundary conditions. In order to ensure the validity of the results, the VCFEM model and the ordinary finite element model containing multiple randomly distributed elliptical inclusions and interfacial phases were established. Then, the impact of several factors on the equivalent elastic constant of particle reinforced composites,including the ratio of inclusions, the thickness of the interfacial phase and the elastic modulus of the interfacial phase were analyzed. It is found that the thickness and elastic modulus of the interface phase have a greater influence on the equivalent elastic modulus of the material,but have a smaller influence on the equivalent Poisson's ratio. Meanwhile, the results show that, when the elastic modulus of the interface phase is smaller than that of the matrix and inclusions, the equivalent elastic modulus of the material will be inversely proportional to the thickness of the interface phase and inversely proportional to the proportion of the inclusions.Furthermore, if the interface is too thin, the equivalent of the material The elastic modulus is proportional to the ratio of inclusions; When the elastic modulus of the interface phase is greater than that of the matrix or inclusions, the equivalent elastic modulus of the material is proportional to the ratio of the inclusions and the thickness of the interface phase.
2021, Vol. 42 
