准等熵加载特性对PBXC03炸药起爆的影响规律

为了研究准等熵加载特性对高聚物粘结炸药(PBX)起爆响应特性的影响规律,对具有不同加载压力(8,10,12 GPa)与加载斜率的准等熵加载下PBXC03炸药起爆响应过程进行数值模拟计算。采用准等熵加载下PBXC03炸药起爆响应实验得到1,1.5,2,3,4 mm处炸药背面粒子速度时间曲线,确定了PBXC03炸药的弹粘塑性双球壳塌缩反应速率模型(DZK)参数。利用DZK模型与参数得到了准等熵加载下峰值压力与加载斜率对PBXC03炸药起爆响应特性的影响规律。结果表明,两种加载方式(不同压力与不同斜率)对PBXC03炸药起爆过程均有较大影响,其他条件相同的情况下,加载斜率或峰值压力越大,炸药内的冲击波阵面峰值压力曲线和冲击波迹线增长越快且到爆轰时间越短。

Influence Rule of Quasi-isentropic Loading Characteristics on the Initiation of PBXC03 Explosive

To investigate the influence rule of quasi-isentropic loading characteristics on the initiation response characteristics of polymer bonded explosive (PBX), the initiation response process of PBXC03 explosive under quasi-isentropic loadings with different loading pressures(8, 10, 12 GPa) and loading slopes was numerically simulated. The parameters of an elastic/viscoplastic double hollow spherical-shell collapse reaction rate model (DZK) of PBXC03 explosive were determined by backside particle-velocity history curves at 1, 1.5, 2, 3 mm and 4 mm obtained from the initiation response experiment of PBXC03 explosive under the quasi-isentropic loading. The influence rule of peak pressures and loading slope on the initiation response characteristics of PBXC03 explosive under quasi-isentropic loadings was obtained by the DZK model and the parameters. The results show that the two loading methods(different pressures and loading slopes) have a great influence on the initiation process of PBXC03 explosive. Under other conditions being equal, the higher the loading slope or peak pressure is, the faster the growth of peak pressure curve and the shock wave trace of shock wave front in the explosive, and the shorter the time-detonation is.