装药密度小幅变化对三氨基三硝基苯基聚合物粘结炸药短脉冲冲击起爆特性的影响

Effect of Slight Density Change on Short-duration Shock Initiation Characteristics of TATB-based Polymer Bonded Explosive

为了研究炸药密度的小幅差异对其短脉冲冲击起爆特性的影响程度和规律,利用爆炸桥箔加载技术(电炮)结合激光干涉测速技术对不同密度的某三氨基三硝基苯(TATB)基聚合物粘结炸药(PBX)开展了短脉冲冲击起爆实验研究。结果表明:TATB基PBX炸药的密度在其正常值1.895 g/cm^3上下变化0.01 g/cm^3,即从1.885 g/cm^3变化到1.905 g/cm^3,其起爆的能量阈值相应从5.38 GPa^2·μs增大到8.20 GPa^2·μs,炸药对短脉冲冲击变得更钝感。由此可见,在实际应用中将炸药密度的一致性至少保持到百分位十分必要。

The aim of this study is to examine the effect of slight density change on the short-duration shock initiation characteristics of triaminotrinitrobenzene（ TATB）-based polymer bonded explosive（ PBX）. The PBX samples with different density are initiated by high speed Mylar flyer plates which are accelerated by an electric gun,and the displacement interferometer system for any reflector（ DISAR） is used to determine the velocities of flyer plates. And then the shock initiation thresholds（ 50% probability of initiation） for the samples are calculated. The results show that a slight change in density leads to a substantial change of the shock initiation threshold： as the densities of the samples change from 1. 885 g/cm^3 to 1. 905 g/cm^3,the shock-initiation threshold increases from 5. 38 GPa^2·μs to 8. 20 GPa^2·μs correspondingly,and the samples become less sensitive to the shock. This indicates that the effect of slight density change on the shock initiation behavior of PBXs cannot be ignored,and suggests that it is necessary to keep the explosive density uniform（ at least on the percentile order of magnitude）.