Micromechanics Strain Response of Ceramic-Matrix Composites Under Creep-Fatigue Loading at Elevated Temperature

In this chapter, the time-dependent damage evolution in carbon fiber-reinforced silicon carbide ceramic-matrix composites (C/SiC CMCs) under creep-fatigue loading at elevated temperature was analyzed using a micromechanical approach. Synergistic effects of creep-fatigue peak stress level and damage in the matrix and the interface on time-dependent damage evolution in C/SiC composites were analyzed. Relationships of creep-fatigue damage mechanisms, damage parameters, temperature, and duration were determined. Time-dependent composite’s strain response and interface debonding and oxidation damage state in C/SiC composite under different creep-fatigue peak stress levels were predicted. Effects of composite constituent properties, creep-fatigue damage state, temperature, and duration on damage evolution in C/SiC composites were analyzed.