Numerical simulation for analyzing shock to ignition of PBXs with different compositions in meso-structural level

By considering the particle size, location in random distribution and the composite content, a three-dimensional computation model was developed for explosive particles in free deposition. The pressing process of the explosive particles from free deposition to molded explosives was numerically simulated by using the non-linear finite element method. Based on the above, the meso-structural models of PBXs (HMX+TATB+Estane) were established. Thereby, numerical simulations were conducted to analyze the shock-to-ignition processes of the PBXs with different compositions in the meso-structural level. In the above numerical simulations, the thermo-mechanical coupling effect and the self-sustained thermal reaction within the PBXs were taken into account. The influences of the composition contents on the shock-to-ignition performances of the PBXs were discussed. The simulated results show that the composite explosives containing HMX and TATB become less sensitive as the TATB content in them increases.