Abstract
Under stress rupture loading, stochastic loading affects the internal damage evolution and lifetime in fiber-reinforced ceramic-matrix composites at intermediate temperatures. Multiple damage mechanisms, for example, matrix cracking, interface debonding and oxidation, and fiber fracture, were considered in the analysis of stochastic loading. The strain, fiber/matrix interface debonding and oxidation ratio, and the broken fibers’ fraction versus the time curves in the SiC/SiC composite in constant and three different stochastic loading conditions were analyzed. The effects of stochastic loading stress level, stochastic loading time, and time spacing on the damage evolution and lifetime in the SiC/SiC composite were discussed.
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