Micromechanics Stress–Strain Behavior of Ceramic-Matrix Composites Under Monotonic Tensile Loading at Room and Elevated Temperatures

Under tensile loading, the stress–strain curves of ceramic-matrix composites (CMCs) exhibit nonlinear behavior at room and elevated temperatures, due to the internal complex damage mechanisms, i.e., multiple matrix cracking, interface debonding, and fibers failure, etc. In this chapter, the micromechanics stress–strain behavior of CMCs subjected to monotonic tensile loading at room and elevated temperatures were investigated. The micromechanics of damage models and constitutive models were developed. Experimental tensile stress–strain curves of different SiC/SiC composites at room and elevated temperatures were predicted and the internal damage evolution of matrix cracking density, interface debonding ratio, and interface oxidation ratio were also obtained. Effects of fiber volume, saturation matrix crack spacing, interface debonding energy, and fiber’s Weibull modulus on the nonlinear tensile stress–strain curves and related internal damage parameters were also discussed.