Acoustic fatigue properties investigation of plain weave C/SiC composite plate

In this paper, an acoustic fatigue model is proposed to obtain the residual strength of plain weave C/SiC composite plate subjected to acoustic loading. The constant amplitude normalized residual strength model and the S-N curves are used in new model, in which the probability density function of stress peaks are adopted to evaluate the effects of random loading on the degradation of residual strength. The degradation of residual strength in a time increment is calculated via an integration of the decrease of residual strength due to the stress peaks in the definitional domain of the peak probability density function. The evolutions of the residual strength under acoustic loading are determined via a double integral method. The residual strengths of C/SiC composite plate predicted by proposed model are in good agreement with the experimental results.