机械冲击载荷下粘性加热对颗粒填充固体推进剂热点形成的影响

利用热粘弹理论和动力有限元方法，分析了推进剂在机械冲击载荷下应力-应变时间历程及粘性加热生热率；将含能颗粒作为圆球体，通过热传导及热分解化学动力学模型，建立了颗粒融化、分解、放热过程的微观模型；将微观模型与宏观变形分析相结合，研究了推进剂基体粘性加热对推进剂内部热点形成的影响；进行数值模拟计算，确定热点形成的外部条件。计算表明，机械冲击载荷能导致基体升温、含能颗粒受热分解，在一定条件下形成热点。

Effect of viscous heating on hot-spot formation of particulate filled propellant under the mechanical impact load

Based on thermo-viscoelasticity theory and dynamic finite element method, the strain-stress history and heat formation rate of viscous heating for solid propellant under the mechanical impact load were analyzed. By using thermal conduction and thermal decomposition models of solid propellant, micro-models for melting, decomposition and exothermal process of energetic particulates were established, when energetic particulates were modeled as balls, combining micro-model with macro impact analysis, the effect of viscous heating on hot-spot formation of solid propellant was investigated. The numerical simulation results show that the mechanical impact load can cause temperature rise of the matrix and decomposition of energetic particulates, which would form hotspots in propellant.