固体推进剂裂纹摩擦热点形成细观模型分析

分析机械撞击载荷作用下复合固体推进剂内部裂纹摩擦形成热点过程。研究在压应力与剪切应力作用下闭合裂纹滑移、扩展、摩擦生热、热扩散、推进剂热分解及与气相产物相互作用。利用断裂力学、热传导、推进剂热分解动力学方法,建立裂纹摩擦热点细观模型。通过模型数值计算,探讨推进剂裂纹摩擦产生高温热点的过程和条件。分析计算表明裂纹摩擦和扩展可导致推进剂形成高温热点。

Meso-scale Hot-spot Model of Crack Friction in Solid Propellant

The study was conducted to investigate how the hot-spot formation was caused by crack friction in composite solid propellant under mechanic impact.It was concentrated on processes of crack surfaces slip,crack growth and friction heating of closed crack driven by sheer stress,heat conduction,decomposition of solid propellant and its interaction with the gas-phase product.In view of the fracture mechanics,heat conduction and dynamics of thermal decomposition of solid propellant,the meso-scale hot-spot model of crack friction was established.By making numerical calculation of the model,the process and condition for hot-spot formation were discussed,from which it is concluded that friction between crack surfaces slip and crack growth can lead to formation of hot-spot in composite solid propellant.