Deformation and damage modeling of ceramic matrix composites under multiaxial stresses

Ceramic matrix materials (CMCs) are candidates for several aerospace applications. There is a need for accurate design and life prediction of CMC components which would experience multiaxial stress states. The present paper propose a finite - element based method for deformation and damage modeling of CMCs under multiaxial stresses, including shear. Rules are developed to couple the normal and shear damage modes. The material properties and damage constants of the in-situ matrix are determined by analyzing tensile test data on cross-ply and (±45)S specimens. The model is then used to predict the nonlinear load-displacement behavior of a (±45)S tensile coupon containing a hole. Predictions are compared with experimental measurements.