FATIGUE BEHAVIOR OF C/SiC CERAMIC MATRIX COMPOSITES AT ROOM AND ELEVATED TEMPERATURES

摘要

The tensile fatigue behavior of unidirectional C/SiC ceramic matrix composites at room and elevated temperatures in air atmosphere has been investigated in present analysis. The fatigue hysteresis modulus and fatigue hysteresis loss energy corresponding to different cycles have been analyzed. The fiber/matrix interface shear stress has been estimated from hysteresis loops. By combining fiber/matrix interface shear stress degradation model and fiber strength degradation model with fiber failure model, the tensile fatigue life S-N curves of C/SiC ceramic matrix composites have been predicted.