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OA北大核心

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 refined shock decomposition model for silicone rubber.