Damage Growth Simulation of Ceramic Matrix Composites Reinforced with Ceramic Fibers

摘要

It is known that toughness of ceramic matric composite materials (CMCs) is improved by interfacial sliding between the fiber and matrix. To use CMCs as a structure material, it is important to clarify their mechanical behavior during fatigue loading as well as static loading. According to our previous study [1], hysteresis loops appeared in the stress-strain relation during fatigue loading of a SiC fiber reinforced SiC matrx composite, accompanied with changes in the strain range and average strain. In this study, A new finite element model for the damage analysis during cyclic loading of this material was proposed, in which the effect of the friction of interfacial sliding after the fiber/matrix debonding are taken into account. The results showed that the shift and form of hysteresis loop were qualitatively simulated by changing the values of mechanical parameters such as interfacial shear strength and coefficient of static friction.