铸装TNT/RDX爆轰过程导电性及反应区厚度实验

Electrical Conductivity and Reaction Zone Width Measurement of Detonation Process for Cast TNT/RDX Compositions

利用冲击起爆方式改进了炸药爆轰过程电导率的同轴测试方法,推导出其电导率计算公式。采用输入冲击波压力匹配的方法减小了反应区内波的反射作用和爆轰成长过程的不稳定性对其电导率的影响,进而测得铸装TNT炸药和TNT/RDX混合炸药爆轰过程中随时间变化的电导率曲线。通过分析曲线中拐点出现的原因,推导出炸药的化学反应时间和反应区厚度。研究结果表明,RDX的增加会降低铸装TNT/RDX炸药的最大电导率;得出铸装TNT炸药的化学反应时间约为0.08μs,反应区厚度约为0.41 mm;几种铸装TNT/RDX炸药的反应区厚度均在0.5 mm附近。

The coaxial measurement of electrical conductivity was improved by using shock initiation method, and the conductivity formula was derived. The suitable shock wave pressure was input to limit the shock wave reverberation in reaction zone and instability in detonation growth. And the conductivity curves of cast TNT and TNT/RDX compositions were studied. The chemical reaction times and the reaction zone widths were acquired by analyzing the inflexions in curves. Results show that the maximal conductivity decreases with the increasing of RDX in cast TNT/RDX compositions. The reaction time of cast TNT is about 0.08 μs, and the reaction zone widths of cast TNT and several TNT/RDX compositions are about 0.4 mm and 0. 5 mm respectively.