孔隙度对PBX炸药冲击起爆影响的实验研究

为了研究孔隙度(装药密度)对PBX炸药冲击起爆爆轰成长的影响,采用炸药冲击起爆锰铜压阻一维拉格朗日实验测试系统,测量了不同孔隙度的PBXC03炸药(HMX的质量分数为87%,TATB的质量分数为7%,黏结剂的质量分数为6%)冲击起爆过程不同拉格朗日位置的压力-时间历史。结果显示:在本文装药范围和加载条件下,孔隙度对PBX炸药冲击起爆爆轰过程的影响不单调,中等密度的炸药冲击起爆和爆轰成长最快,这是热点点火过程与燃烧反应过程共同作用的结果。

Experimental research on effects of porosity on shock initiation of PBX explosive

To investigate the influence of the porosity (charge density) on the shock initiation and detonation of polymer bonded explosives (PBXes), a one-dimensional Lagrangian experimental testing system is adopted to measure the pressure-time histories at different Lagrangian locations of PBXC03 (87% HMX, 7% TATB, 6% binder by weight) with three different porosities (or charge densities), in which, an explosive plane-wave lens is used to generate a high-pressure planar detonation wave loading, and the Manganin piezoresistive pressure gauge measurement technique and the attenuation technique by both air-gap and Al-gap are used. The experimental results show that the detonation grows the fastest in the explosive with a moderate porosity. This work provides more detailed experimental data for the further development of mesoscopic reaction rate models for shock initiation of heterogeneous explosives.