基于简易冲击分解模型的爆轰驱动硅橡胶数值模拟及实验解读  

Numerical simulation and experimental interpretation of detonation-driven silicone rubber based on a simple shock decomposition model

作　　者：刘军[1] 殷建伟[1] 张凤国[1] LIU Jun;YIN Jianwei;ZHANG Fengguo(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《爆炸与冲击》2025年第1期123-132,共10页Explosion and Shock Waves

基　　金：国家自然科学基金(12101062,12271054)。

摘　　要：为了反映爆轰驱动下硅橡胶发生冲击分解反应的物理过程,提出了一种简易的硅橡胶冲击分解模型。基于该模型,对爆轰驱动含硅橡胶夹层钢板实验进行了模拟,并分析解读了钢板的自由面速度。结果表明,实验中硅橡胶发生了冲击分解反应,导致钢板的自由面速度曲线出现了首次起跳中间速度平台及首次起跳速度峰值降低的现象。受硅橡胶冲击分解影响,首次入射波压力将在临界冲击分解压力附近弛豫一段时间,再继续升高至最高压力。该压力波作用于钢板的自由面后,出现了自由面速度在中间速度平台停留一段时间,之后继续升高至速度峰值的现象。硅橡胶冲击分解后的气相物质可压缩性较高,首次加载波内较多的能量被用于压缩气体做功,导致首次波传播至自由面时能量衰减,峰值压力降低,首次起跳速度峰值降低。Silicone rubber has been widely used as a typical sandwich-structure or cushion-structure material in various high pressure loading environments.Under pressure loading of up to tens of GPa,silicone rubber may undergo shock decomposition reaction,and the decomposition products contain gas-solid mixture.Numerical simulation without the shock decomposition of silicone rubber cannot interpret some complex physical phenomena observed in detonation driven experiment.In order to illustrate the shock decomposition effect of silicone rubber,a simple shock decomposition model for silicone rubber is proposed based on the existing physical knowledge.By using the simple shock decomposition model for silicone rubber,the simulations of the experiment setup of detonation driven silicone rubber foam are carried out,and the simulated free surface velocities are compared with the experiments.The results show that the shock decomposition of silicone rubber can reasonably interpret the two grotesque phenomena observed in the experiment.During the shock decomposition process,the first incident pressure of silicone rubber would relax around the critical shock decomposition pressure for a period of time.As a result,the free surface velocity of steel plate exhibits a platform as observed in the experiment during the first take-off process.The compressibility of gas phase products of silicone rubber after shock decomposition is much higher than the solid/fluid materials,so more energy in the first incident wave is consumed to compress gas products to do work,leading to energy attenuation and peak pressure reduction when the first incident wave propagates to the outer surface of steel plate.Consequently,the peak value of the first take-off free surface velocity of steel plate decreases.Insight into the dynamic behavior of silicone rubber at high pressures is particularly valuable for predicting their response to extreme conditions,and it contributes to a deeper understanding of such experimental phenomena and to the proposal of a more refi

关 键 词：硅橡胶 爆轰驱动 冲击分解 分解压力 

分 类 号：O381[理学—流体力学]