The effect of shell material and load coefficient on the expansion of shell driven by detonation

Abstract

Detonation driven metal expansion and fragmentation is a complex transient nonlinear dynamic problem. The research on the influence of the materials and load coefficients on expansion driven by detonation can provide a basis for fragment velocity prediction and warhead design. The numerical simulation of detonation driving was studied, including the TNT charge with five kinds of materials and six kinds of load coefficient β values shells. The characteristics in detail which the experiment was difficult to reflect were obtained, and the influence of material properties and β value of metal shells on the fragment velocities were revealed. With the increase of the density of the material, the dissipative energy of the shock wave in the casing decreases, and the contribution of the shock wave loading to the velocity of the fragment increases. Meanwhile, the increase of the shell wall thickness and the corresponding decrease of β value lead to the increase of the internal dissipation energy of the shock wave in the casings, the decrease of the energy for the shell expansion acceleration and the decrease of the contribution to the fragment velocity.