Numerical analysis of the mechanical behavior of ZTAp/Fe composites

Abstract

Composites are complex and inhomogeneous. Various factors of microstructure will affect their mechanical behaviors. Based on a systematic numerical analysis, we present a coupling effect of the volume fraction of reinforced particles and the particle-matrix interface properties on the mechanical properties of ZTAp/Fe composites. We find that for yield limit and peak stress, the particle-matrix interface properties show a dominant impact while for the critical strain the particle volume fraction is the main factor. A combined effect of the particle volume fraction and the interface properties is found on the elastic modulus. The von Mises stress distributions are investigated and the results show that the particles clustered in the direction perpendicular to tensile load have larger debonding potential. In addition, the probability of particle cracking and the number of interface debonding are investigated to analyze the damage mechanism of the composites. We find that strong bonded interface can withstand more extra stress and protect the particle from cracking. The interface debonding rate becomes smooth after some critical value as the strain increases continuously due to a steady crack propagation after crack initiation along the interface line. This paper provides a guidance towards the design of advanced ceramic particle reinforced metal matrix composite materials.