Experimental study and initial velocity calculation of particles dispersed by center explosive

There are some differences in dynamic mechanics between metal particle pack and metal fragments driven by explosive, and the velocity metal particles obtained differs from calculation of Gurney model, that imply the Gurney model can not be directly used to calculate the velocity of metal granular swarm driven by explosive. Metal granular swarm dispersed by cylinder explosive was investigated experimentally, and the result shows that the average initial velocity of particles is less than that calculated with Gurney model. Besides the mass ratio between granular swarm and explosive, other 4 factors including lateral effect, porosity, particle size, and true density of particle also affect average initial velocity of particles. Considering the 4 factors, Gurney model was modified to calculate average initial velocity of particles dispersed by explosive, and the result was in good agreement with experiment. The modified Gurney model can be used to the engineering calculations of average initial velocity of explosive dispersing metal granular.