5GPa内JO-9159炸药的磁驱动准等熵压缩响应特性

Response of JO-9159 under Magnetically Driven Quasi-Isentropic Compression to 5 GPa

较宽压力范围内未反应炸药的动力学响应特性对于深入认识压缩波作用下炸药起爆热点形成机制具有重要意义。磁驱动准等熵压缩加载（无冲击压缩）是获取较宽压力范围内未反应炸药的动态压缩力学特性的有效手段。基于大电流产生的电磁力作用原理,在国内率先实现了炸药的磁驱动无冲击压缩实验技术,获得了5 GPa内JO-9159炸药在磁驱动准等熵压缩加载下的速度响应历史。利用一维流体动力学编码对加载过程进行了模拟,计算得到的粒子速度曲线与实验测得的粒子速度曲线符合较好。随着厚度的增加,样品与窗口界面处速度的陡度越来越大,加载期间样品应变率峰值在105~106/s量级,随着样品厚度的增加,应变率尖峰变窄、峰值增加。

It is very important and instructive for us to further investigate the formation mechanism of hot spots in explosive initiation in wide pressure zone.Magnetically driven quasi-isentropic compression（shock less compression） is an effective method to research the dynamic behaviors of un-reacted explosives in high pressure.Based on the working principle of electro-magnetic force produced by large current,the shockless compression technique driven by magnetic force is first achieved in domestic.A pressure of 5 GPa is obtained in the experiments of magnetically driven quasi-isentropic compression.The particle velocities of the interface between JO-9159 explosive and LiF windows are gained.The isentropic compression procedure was numerically simulated by one dimensional hydrodynamics code.The simulated particle velocities are in good agreement with experimental results.The gradient of particle velocities between the windows and the samples becomes larger when samples become thicker.The strain ratios of the samples are in 105/s～106/s,and the peak of strain ratio becomes narrower but higher when samples become thicker.