Discrete element simulation of internal stress in SiCp/aluminum matrix composite prepared by pressureless infiltration

Abstract

SiCp / Al-Mg-Si matrix composite was prepared by pressureless Infiltration Process. By discrete element method, microcosmic two-dimensional numerical model of SiCp / Al matrix composites was established and the simulation of the size and distribution of micro-contact pressure and tension was performed from small load to big load until destruction. The results showed that the contact pressure appears the partial focus phenomenon, while the distribution of the contact tension tends to increase. When the calculation loop reaches 170,000 time steps, all the focus areas of contact pressure almost connected, but the contact tension is almost unchanged. At this time, the material closes to destruction. When the calculation loop reaches 210,000 time steps, the contact pressure tends to uniformity, but the distribution of contact tension becomes sparser. The contacts between the discrete units are approximately scattered and the contact tension is close to zero and the contact pressure is evenly even-distributed.

Keywords: Aluminum-matrix Composite, SiC, Discrete Element Simulation, Internal Stress