Investigation on ablation behavior of carbon composites using coupled thermo-chemical peridynamic model

This study aims to develop a thermo-chemical coupled model under non-local peridynamic framework to describe the ablation behaviors. The model is derived from the free energy density function that incorporates chemical energy and internal energy description and will be solved in integral form. Based on the proposed coupling model, a comprehensive ablation model for typical thermal protection materials is established, considering the processes including exothermic combustion, endothermic sublimation, and oxygen diffusion. By comparing simulation results with different coupling terms, we achieved surface temperature and ablation rate results that are closer to experimental data, validating the capability of the proposed model of describing the competition mechanism between reaction and diffusion during the ablation process. Furthermore, the ablation process of carbon composites was simplified and simulated, capturing ablation morphology similar to experimental results and exploring the influence of varying ablation rates on the morphology.