A model for estimating nonlinear deformation and damage in ceramic matrix composites

Abstract

The present paper addresses the estimation of global deformation of a continuous-fiber brittle matrix composite over a length much larger than the largest microstructural dimension of the composite, such as the fiber diameter and the fiber spacing. Initial microcracks and progressive microcracking of the matrix and interfaces under time-dependent load and temperature are considered. The model also includes consideration of inelastic deformation of one of the constituents. In this paper, the equations of the model are developed and applied to model the stress–strain behavior of several silicon carbide/silicon carbide ceramic matrix composites and the creep behavior of an oxide/oxide ceramic matrix composite. Comparison with test data shows that the model is able to capture the wide range of deformation behavior seen in these ceramic matrix composites.