Multi-Scale Modeling of Continuous Ceramic Fiber Reinforced Aluminum Matrix Composites

Abstract

Continuous ceramic fiber reinforced metal matrix composites (MMCs) have demonstrated very high specific strengths and stiffness but use in structural applications has been limited by their inherently low ductility. In this work, a multi-scale micromechanics based finite element approach is used to predict, and understand the effect of microstructure on the macroscopic behavior and failure mechanisms of continuous ceramic fiber reinforced MMCs. A hierarchal approach is proposed in which a micro-scale model is used to predict yarn level response based on the properties of the matrix and individual fibers. The yarn properties determined from the smaller scale model can then used as input in a micromechanical fabric composite model consisting of yarns and matrix to predict the continuum response of the MMC. Cohesive zones are used to model the interfacial properties at both scales. The effects of interfacial properties and defects on the continuum response are investigated. Simulation predictions are compared with experimental data.