Condensed Explosive Detonation Conductivity Study Of The Process

The main works of this dissertation are as follows:1. On the basis of many experiments and by extracting the excellence from the scheme of coaxial and planar measurement, the design of the gauge and assembling mode were ascertained, and the experimental measuring method of electrical conductivity was established elementarily. The voltage waveform of the experiments repeated well, and the interference was reduced obviously, which showed the changing process of conductive phase of detonation products well. The method could be used in studying the electrical conductivity in shock initiation process of condensed explosives.2. The electrical conductivity in the shock initiation process of TNT explosive under different initial shock load and of RHT-906, JO-9159, and JB-9014 explosive under the same condition was recorded by using the scheme of planar measurement established. According to the experimental results, the changing trend of the voltage and electrical conductivity of TNT, RHT-906, JO-9159 was consistent on the whole, which was distinctive obviously with JB-9014. There were two fast decrease of the voltage profile and two obvious peak of the electrical conductivity in the shock initiation process of JB-9014 explosive, perhaps because partial explosive continued reacting in the expansion process of detonation products. The maximum electrical conductivity of TNT decreased with the reduction of initiation pressure. Compared with TNT explosive, the maximum electrical conductivity of RHT-906 explosive was smaller at the same loading condition. The reaction time of TNT explosive detonating was obtained, which was about 0.11μs, 0.12 μs, 0.16μs and 0.15 μs respectively in four experiments, and that of JO-9159 was about 0.0875 μs.3. The electrical conductivity profile in the shock initiation process of aluminized explosives showed that the maximum value increased obviously with addition of aluminum powder in RDX, and the influence mechanism was analyzed. According to the experimental result, the order of the maximum conductivity was obtained as follows: aluminized explosives > TNT > RHT-906 > JO-9159 > JB-9014.4. The detonation model of aluminized explosives was established. By Choosing the ignition and growth model of reaction, JWL equation of state of the explosive and detonation products, combined with the calculation method of finite element in DYNA2D, the reaction degree of aluminized explosives in the shock initiation process was simulated. As a result, the reaction degree of different Lagrange position in the axis had some difference. Comparing calculation result with the experiment, there was close relation between the reaction degree and the electrical conductivity in the shock initiation process of aluminized explosives. The electrical conductivity could reflect the initiation process of aluminized explosives well.