Numerical Simulation of Explosive Particles Compaction

Understanding the mechanics of explosives compaction can provide theoretical foundation to improve pressing technique and quality of explosive component. In this paper, a calculating model of explosive particles pressed to charge was developed. The explosive particles were considered as being the uniform diameter and arraying in order. With non-linear finite element calculating method, the numerical simulations of explosives compaction were conducted, and the deformation, mechanics and temperature of explosive particles were analyzed. The calculated results show that explosive particles compaction experiences two phases: displacement and deformation. In the displacement phase, the stress centralization appears on the contact surfaces between particles and constrained surface. In the plastic deformation phase, the stress in the particles increases sharply and tends to be uniform. The explosive particles temperature increases with pressing. When the explosive charge is close to the density of crystalline grains, the highest temperature occurs in the center of charge.