Experimental and numerical investigations on the formation and penetration of jet projectile charges against concrete targets

Jet Projectile Charge (JPC) is relatively a new class of perforating jets mainly used for defeating concrete targets. This paper describes the experimentation and computational modeling of two classes of JPC models. To investigate the jet profile and tip-tail velocities, flash x-ray radiographs were employed for both JPC classes. Penetration experiments were carried out for one JPC class on concrete targets of various thicknesses to find the penetration performance. Both designs belonging to class one produced holes with satisfied depth and width in the concrete targets. Numerical simulations for both classes were performed using Autodyn-2D software and the simulation results were consistent to those from experimental studies. In simulations, the particle tracking method and splitting of liner into two parts were employed to investigate collapse patterns and design defects of a JPC. Suggestions have been made to improve a particular design. The splitting of liner in simulations reproduces very fine details of liner collapse mechanism.