Numerical simulation of ablation behavior and thermal stress field of fused silica composite

For the purpose of studying the rationality of cluster design of the fused silica ceramic composite developed by Harbin Institute of Technology, the ablation behavior and thermal stress distribution of the component prepared by this kind of composite material were investigated by the means of finite element numerical simulation. Based on macroscopic thermal stress analysis of the component model, two meso-mechanical models, which were used to analyze the elastic stress field in the microstructure of the fused silica ceramic composites, were proposed. The simulation results of Model 1 showed that the material components design is rational and the reinforcement phases of carbon fiber and BN particles obviously play the role of loading-bearing. On the basis of the calculation of the elastic stress field in the microstructure of the composites, how Si₃N₄ particles affect the stress distribution was analyzed in Model 2. The simulation results showed that Si₃N₄ particles reduce the thermal shock resistance, which were consistent with the experiment results.