Abstract
Critical ricochet angles of 25 mm APDS-T and APFSDS-T projectiles have been evaluated numerically for a range of steel plate thicknesses. Ricochet is a phenomenon of projectile deflection that may be observed when striking highly oblique targets. Critical ricochet angle is defined here as a transition angle from regime of ricochet to perforation. The critical ricochet angle may depend on material properties of both target and projectile i.e. density, strength, failure, high strain rate properties, geometry, target thickness, projectile L/D ratio, shape, and the impact velocity. This study investigates the effect of thickness and strength of steel plates on critical ricochet angle. In addition, critical ricochet angles of 25 mm medium caliber projectiles were compared. Each armor steel target was impacted at varying angles of incidence until ricochet was observed. We demonstrate that there is an optimal thickness of steel targets against the two types of penetrators. The optimum may be used for armor platforms frontal upper hull design. It is recommended to continue to validate the numerical model results with more experimental data.
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