Material Modeling for Cross-Ply Ceramic Matrix Laminates With Progressive Damages and Environmental Degradation

A physically-based damage model has been developed to predict the nonlinear behavior of cross-ply ceramic matrix laminates due to progressive failures. It has been shown to model the nonlinear stress-strain response of chemical vapor infiltrated (CVI) SiC/SiC composites under tension loading accurately. This model utilizes a consistent set of measurable material parameters as inputs and shows good agreement with measured tensile stress-strain curves for a variety of ply thickness ratios. The material model is also utilized to characterize the environmentally induced property degradation in CMC’s.