Insensitive Explosive Shock Initiation Process And The Value Of Overpressure Detonation Calculated

The shock-to-detonation transition (SDT) of insensitive high explosives (IHE) is researched in this paper. First the mechanism of SDT of IHE is discussed here. The empirical reaction model of Hybrid used to describe the SDT of IHE is studied. The excitation process, homogeneous reaction and slow reaction are considered in the reaction model. It could decrease the activation energy of IHE. The reaction model adapts to calculate the SDT of IHE, especially the high compaction and very fine-grained HE. The calculated results of the SDT of IHE including PBX9502, LX-17 and submicron TATB are according with the experiments. The JWLT equation of state (EOS) used to calculate the overdriven detonation is described. The phenomenon of colliding diverging detonation is calculated by JWLT EOS. The result indicates that the JWL EOS can steepen the slope of the Hugoniot in the high pressure regime and increase the isentropic parameter and sound speed in the overdriven state. The peak pressui'e in colliding diverging detonation is more 10 percent than with the standard JWL equation of state. The relationship among detonation simulation, thickness of grid and artificial viscosity is discussed. Through modifying the form and magnitude of artificial viscosity, the results calculated by the hybrid reaction model in the thick grid are also according with the experiments. It indicates that the method can save computational cost.