NUMERICAL SIMULATION ON THE VELOCITY DISTRIBUTION FOR DOUBLE-LAYERED PREFORMED FRAGMENTS BY EXPLOSION

Abstract

As one of the most commonly used conventional ammunition in the military field, the double-layered preformed fragment warhead can achieve maximized damage efficiency against multiple types of targets within large coverage. In this paper, four different arrangement types of the double-layered fragments cylindrical casing filled with explosive charge were discussed. Numerical simulation were conducted to calculate the flight velocity and flight angle of all the fragments using the dynamic 3D software ANSYS/LS-DYNA. Based on the simulation results, the effects of the fragment layer on the distribution of the fragment velocity were analyzed by comparing different types of double-layered preformed fragments cylindrical casing. Furthermore, the detailed process such as the propagation of detonation wave, the collision of fragments between different layer, were studied to reveal the difference of the distribution of the drop point with different initial arrangement for double-layered fragments. Further research involving with different radius and material of fragments were conducted to figure out the critical parameter in warhead design. Finally, the statistics on energy utilization of four different double-layered preformed fragments showed the phenomenon of the leak of detonation product between fragments can affect the terminal velocity distribution.