Research On Detonation Characteristics Of Emulsion Explosives

The current situation of research on detonation properties of emulsion explosive(EE) all over the world is reviewed in this dissertation. According to the demand of EE development, the experiments of the detonation velocity, shock sensitivity, shock Hugoniot relation and metal acceleration ability of EE have been performed. The main works and the results are as follows:1 Through the experiments of several kinds of sensitizers which have been used commonly in industrial explosives, influence of sensitizer type, sensitizer content and density of EE on the detonation velocity of EE is studied. It is found that the samples sensitized by glass micro-balloons have the highest detonation velocity, the samples sensitized by chemical gassing have higher detonation velocity and the detonation velocity of the samples sensitized by expanded pearlites is the lowest. With the increase of the density of EE, the detonation velocity first increases to the top point, then decreases until EE has been dead pressed.2 The study of shock sensitivity of EE has been carried out for the first time in domestic. The Langlie method is introduced to determine the sensitivity of explosives and the analytical mathematics models for EE shock sensitivity have been developed. The critical PMMA gap length of EE is about 44mm and the critical shock pressure of EE is about 2.5GPa. The shock initiation pressure values of EEs are Comparable to those of military explosives.3 A new device has been designed to measure the shock Hugoniot relation of condensed explosives and the test system has been set up. The shock Hugoniot relation of unreacted EE is obtained as D= (2.15±0.13)+(1.95±0.14)u_p. The method used to measure the shock Hugoniot relation of EE in this dissertation is simpler than the methods used abroad. The results in this dissertation are accurate. The constitutive relation of unreaction EE has been concluded: (P-0.781)V^6.8 =0.391.4 The cylinder test of EE has been carried out and some characteristics of the metal accelerating ability of emulsion explosive are acquired. The metal accelerating ability of EE is about 60% of TNT and the working capacity of EE is about 37% of TNT.5 A detonation model of EE is established and two-dimension numerical simulation is carried out for cylinder test. Comparing the calculation results with the experiment results, the parameters of JWL equation of state of detonation product for emulsion explosives can be determined as follows:...