Two-dimensional mesoscale simulation of shock ignition in PBX explosives

To investigate the mechanism of shock ignition in heterogeneous explosives, two-dimensional mesoscale simulation of PBX explosives under shock loading was conducted. Through simulation of explosive particles pressing, the mesoscale structure of PBX was obtained. Then the shock ignition of PBX explosives was calculated, and the coupled thermo-mechanics and self-heating reaction were considered, and the influence of explosive density, particle size and binder content on shock ignition were analyzed. The results show that hot spots focus on the interface between explosive particles and binder. The critical pressure to ignite explosives in small particle size is higher than that in large particle size. The critical pressure to ignite explosives in low density is higher than that of explosives in high density. In addition, binders play an important role in attenuating shock intensity on explosive particles, and PBX explosives in more binder content are more insensitive than those in less binder content.