Impact Response of Thin Aluminium Plate with Varying Projectile Obliquity and Span Diameter

Abstract

This paper presents a three-dimensional (3-D) numerical investigation to know the effect of projectile obliquity and target span diameter on ballistic performance of 1-mm-thick target plate against ogive nosed projectile. The span diameter of 1100-H12 aluminium targets were varied as 68, 100, 150, 200 and 255 mm. Each span diameter of the target was impacted by ogive nosed projectile with varying angle of incidence as 0°, 10°, 20°, 30°, 40°,50° and 60° or till ricochet occurred. The numerical findings were validated through experiments for 0° projectile obliquity. Both the target span and angle of incidence of the projectile affected the mechanics of target deformation and its ballistic resistance significantly. The ballistic limit was found to be increased with increase in target span diameter as well as projectile obliquity. Moreover, the critical angle of ricochet also decreased with increase in target span diameter particularly at high incidence velocity.