On temperature‐dependent interfacial fracture energy/stress intensity factor and matrix cracking in ceramic composites

Abstract

AbstractThe first matrix cracking stress is a crucial indicator to appraise the mechanical properties of ceramic‐matrix composites, which is the starting point of permanent damage. Based on the classic energy balance method and stress intensity method, two temperature‐dependent first matrix cracking stress models of fiber‐reinforced ceramic matrix composites are established, respectively. The model established by the energy balance method considers the evolution of interfacial fracture energy with temperature, and the model established by the stress intensity method takes into account the evolution of stress intensity factor with temperature. The predictions of the above models in a wide temperature range are verified using experimental data available in the literature, which shows the rationality and accuracy of the above models. Moreover, on the basis of the energy balance method model, the main factors controlling the first matrix cracking stress at different temperatures are analyzed by the numbers. Finally, in view of the analysis results, some suggestions on how to optimize and enhance the first matrix cracking stress at different temperatures are put forward.