不同加载压力下炸药冲击起爆过程实验和数值模拟研究

采用炸药平面透镜爆轰加载及空气与隔板综合衰减技术,建立基于锰铜压阻传感器的 一维拉格朗日实验分析系统,得到了3 种加载压力下两种颗粒度PBXC03 炸药冲击起爆不同拉格 朗日位置的压力历史,以及加载压力对炸药冲击起爆过程的影响规律。采用DYNA2D 程序,对两 种颗粒度PBXC03 炸药的冲击起爆过程进行数值模拟,计算结果与实验结果趋势一致。结果均表 明:加载压力减小,炸药中前导冲击波速度增长变慢,压力增长变缓,炸药的到爆轰距离增加。数值 模拟得到的两种颗粒度PBXC03 炸药起爆压力和到爆轰距离的关系与文献15] 的POP 图曲线吻 合较好,验证了文献14]建立的PBX 炸药冲击起爆细观反应速率模型的合理性。

Experimental and Numerical Study on the Shock Initiation of PBXC03 Explosive under the Different Loading Pressure

The shock initiation experiments on the PBXC03 explosives in two different formulations, namely, the medium and the coarse one, are performed to obtained in-situ manganin piezoresistive pres- sure gauge data at various shock pressure. The loading technique of explosive plane-wave lens and the at- tenuation technique produced by both air-gap and Al-gap are used in the one-dimensional Lagrangian ex- perimental system. The Numerical simulation on the shock initiation of the two kinds of PBXC03 explo- sives are performed by using the two-dimensional hydrodynamics software DYNA2D. The computational propagation trajectory and pressure growth process of the shock front agree well with the experimental da- ta, and the computational run-distance-to-detonation points show good agreement with previously pub- lished Pop-plot data, which confirms that the mesoscopic reaction rate model used in this paper is reason- able.