Scattering Characteristics of Sub-Millimeter Metal Particle Group Driven by Explosion

Under the implosion of the carbon fiber composite (CFRP) shell embedded in dense inert metal particle, the damage elements dominated by dense inert metal particles will be formed. Thus, accurately acquiring and predicting the scattering performance of heavy metal particle cluster driven by internal-burst is of great significance for the design and evaluation of damage capability of low collateral damage munitions. In this paper, both the experimental study and numerical simulation are adopted to investigate the scattering characteristics and influencing factors of the sub-millimeter WC particle group under explosion. Based on the discrete element method (DEM), the disordered model and numerical simulation of particles in WC particle layer are carried out according to the entity condition, the effects of different particles, loading ratio and length-to-diameter ratio on particle velocity are analyzed. The results show that the larger size of a particle can result in a lower velocity under the condition of the same loading ratio. The outer layer particle velocity at the end is the same, but the velocity difference near the relative axial position X/L=0.62 is the largest. When the ratio of length to diameter is in the range of 0.5–1.5, both the particle velocity and velocity difference increase with the ratio of length to diameter, and the incremental velocity of the particles at the detonating end is smaller than that at the non-initiating end.