Monte Carlo simulation of creep failure in a 0°/90° plain weave SiC/SiC composite lamina

摘要: A Monte Carlo model of the effects fiber creep in a 0°/90° plain weave ceramic-grade Nicalon reinforced SiC composite has been developed. Creep degradation fibers was predicted to result stress dependent premature failure woven ceramic matrix composites, and that modeled using power-law. power-law exponent 3.1 ± 0.1 predicted. The be independent initial crack size for length specimen width ratios 0.02, 0.10, 0.25, 0.50. also strength ratio from 0.25 1.0. Premature 90° (transverse) tows resulted low values (less than 0.75), decreased life ratio. For 1.0, equivalent unidirectional composite. At small lengths, 10% improvement reduction 1.0 0.75. This related formation microcracks shielding macrocrack tip accelerated damage. at 0.75 applied stress. However, not occur larger length.