Damage and failure of fiber-reinforced ceramic-matrix composites subjected to cyclic fatigue, dwell fatigue and thermomechanical fatigue

Abstract

Abstract In this paper, the damage and failure of fiber-reinforced ceramic-matrix composites (CMCs) subjected to cyclic fatigue, dwell fatigue and thermomechanical fatigue at elevated temperatures have been investigated. The damage and failure models considering multiple fatigue damage mechanisms, including the cracking of matrix, debonding and sliding of the interface, and the oxidation and fracture of the fibers have been established. The effects of material properties, damage mechanisms, fatigue peak stress, hold-times, testing environments and thermomechanical fatigue phase angles on the damage and failure of CMCs at elevated temperatures have been analyzed. The damage and failure of cross-ply SiC/MAS composite under cyclic fatigue, dwell fatigue and thermomechanical fatigue with different phase angles have been predicted. The effects of testing temperature, loading frequency, loading type on the internal damage accumulation and fracture have been discussed.