颗粒增强复合材料基体破坏过程的数值模拟分析

NUMERICAL APPROACH TO FAILURE PROCESS IN BRITTLE AND HETEROGENEOUS MATRIX FILLED WITH PARTICLES

运用一个材料破坏过程分析ＭＦＰＡ２Ｄ系统，研究了高强度圆形颗粒增强复合材料在拉伸载荷作用下经变形、损伤直至失稳破坏的全过程。分别研究了含刚性颗粒和柔性颗粒基体的不同破坏机制。数值模拟再现了颗粒增强复合材料在变形、破裂过程中的裂纹萌生、扩展规律以及颗粒间的相互作用。

The deformation, damage, and failure process in particle filled composite are studied by using a numerical code, MFPA2D, newly developed by CRISR at Northeastern University, Shenyang, P.R.China. Two kinds of particles, rigid and soft with high strength, are considered. The single particle is studied firstly, then multiparticles are modeled. The results from both the single particle model and the multiparticle model show that the failure mechanisms are strongly dependent on the particle stiffness. The simulations reproduce the crack initiation, propagation and coalescence in brittle and heterogeneous matrix. Interactions between the particles are also modeled. The numerical analysis elucidates the effect of the particle stiffness on the anticipated strength and toughness of the matrix.