2,4-二硝基苯甲醚基熔铸含铝炸药冲击起爆特性

To investigate the effect of explosive particle size on the shock initiation characteristics of insensitive aluminized melt-cast explosives, a one-dimensional Lagrange measuring system with the multiple electromagnetic particle velocity gauge is established for sapphire flyer impact initiation. The particle velocity profiles for the shock initiation and detonation growth processes of an DNAN-based aluminized melt-cast explosive are obtained with different impact velocities. The effects of flyer impact velocity and explosive particle size on the shock initiation and detonation growth are analyzed, and both the shock Hugoniot relation and the parameters of equation of state for unreacted explosive are determined for the aluminized melt-cast explosive. The measured particle velocity profiles are typically in a shape of hump, and the post-shock particle velocity increases obviously and goes after the leading wavefront. The shock initiation process is characterized by accelerated reaction. The post-shock particle velocity increases more rapidly and the shock initiation grows faster in the case of higher loading pressure and smaller particle size. It indicates that the mesoscopic structure greatly affects the shock initiation and detonation growth of aluminized melt-cast explosives.