Characterization of temperature dependence of fracture behavior of monolithic and laminated ultra-high temperature ceramic matrix composites

The fracture behavior of ultra-high temperature ceramic matrix composites at high temperature has received increasing attention. However, few studies consider the effect of particle/crack interaction on the high temperature fracture strength of materials. In this work, the effect of particle/crack interaction is introduced into temperature-dependent fracture strength model of monolithic ultra-high temperature ceramic matrix composites, which also considers effects of flaw size, grain size, and residual thermal stress. Furthermore, by considering the influence of laminated structure, a theoretical model of the temperature-dependent fracture strength of laminated ceramic matrix composites is developed. The effect of particle/crack interaction is also included in this model. It should be noted that the predictions of models agree well with the experimental data of both monolithic and laminated materials without using any fitting parameters. The effect of particle/crack interaction is found to have a significant weakening effect on the strength of materials at different temperatures.

Automated summary

This study considers the effect of particle/crack interaction on the high temperature fracture strength of materials and establishes corresponding models. The experimental results and model predictions are in good agreement, and it is found that particle/crack interaction has a significant weakening effect on the strength of materials.