双层介质隔板试验及被发炸药冲击起爆特性分析

摘要

为研究双层介质隔板下被发炸药的冲击起爆特性,建立了考虑侧向稀疏波影响的被发炸药冲击波能量计算模型,并开展锰铜压阻传感器测压试验.获得了由有机玻璃与LY-12铝合金组合的双层介质隔板排序(两种不同波阻抗顺序)、总厚度h(30 ～60 mm)与厚度分配(有机玻璃厚度比例10％ ～90％)对透射到被发炸药中冲击波各参量的影响规律,试验验证了被发炸药透射冲击波压力及其冲击起爆情况.研究结果表明:选取波阻抗递增的排序时透射冲击波能量较低,对炸药的安全性更有利;随着总厚度的增加,透射冲击波能量逐渐降低,且下降幅度逐渐减小;透射冲击波能量随厚度分配的变化规律与总厚度有关,随着有机玻璃厚度比例的增加,透射冲击波能量呈不断递增(h =30 mm)、先递增再递减(h为40 ～ 60 mm)的趋势.%A calculation model for shock wave energy of acceptor explosive is established to study the shock initiation characteristics of acceptor explosive in double layer medium gap test,in which the effect of lateral rarefaction wave is considered,and a manganin piezoresistive pressure gauge is used for pressure measurement.The effects of sequencing (two kinds of wave impedance sequence),total thickness (30-60 mm),thickness distribution (PMMA thickness ratio of 10％ ～90％) of double layer medium consisting of PMMA and LY-12 aluminum on the explosive transmissive shock wave parameters are analyzed,and the transmissive shock wave pressure and shock initiation situation of acceptor explosive are verified by the experiment.The results show that the transmissive shock wave energy is lower when the sequence with increasing wave impedance is applied,which is more beneficial for explosive stability;the transmissive shock wave energy decreases with the increase in medium thickness,and its decreasing amplitude gradually decreases;the change of shock wave energy with thickness distribution is relevant to the total thickness of double layer medium,and the transmissive shock wave energy exhibits a trend of ascending (h =30 mm),and increases first and then decreases (h =40-60 mm) with the increase in PMMA thickness.