飞秒激光烧蚀炸药的冲击压力数值模拟

飞秒激光能够在极短时间内烧蚀炸药产生高温高压等离子体，飞秒激光烧蚀炸药技术可用于精密加工炸药元件和安全处理废旧弹药.为深入探讨飞秒激光烧蚀炸药作用规律，采用非线性有限元计算方法，建立了飞秒激光烧蚀炸药过程的起爆计算模型，对飞秒激光烧蚀LX-17和LX-10两种炸药过程进行了数值模拟计算，获得了不同飞秒激光能量作用下等离子体和炸药中的压力分布规律.计算结果表明，在飞秒激光烧蚀炸药的过程中，烧蚀产物等离子体和激光作用区外附近炸药的初始压力较高，但是由于激光烧蚀区域极小，炸药内冲击波压力迅速衰减，没有发生起爆现象. 

Impact Pressure Numerical Simulation of Femtosecond Laser Ablation of Explosives

Femtosecond laser can ablate explosives to produce high temperature and high pressure plasma within a very short time. So it can be used to precisely process explosive components and safely dispose of used ammunition. A deep understanding of the laws of femtosecond laser ablation of explosives is the basis for the development of new technologies for femtosecond laser processing of explosives. Based on the nonlinear finite element method, the detonation calculation model of the femtosecond laser ablation explosive process was established. The numerical simulations of the femtosecond laser ablation of LX-17 and LX-10 were carried out. The pressure distribution laws in plasma and explosive at different femtosecond laser energies were obtained. The computational results indicate that the initial pressure of the ablation product plasma and the explosive near laser action zone is very high during the femtosecond laser ablation, but owing to the small ablation zone, the shock wave pressure in explosives decreases rapidly and no detonation occurs.