FINITE ELEMENT ANALYSIS OF RESPONSE OF METALLIC PLATES TO PROJECTILE IMPACT

Abstract

The present study is based on the influence of projectile nose shapes and angle of obliquity on the ballistic resistance of ductile targets, critical angle of ricochet for different shapes of projectile was also determined. Three-dimensional numerical simulations were carried out to study the ballistic resistance of ductile targets subjected to normal and oblique impact. 1 mm thick 1100-1-112 aluminum targets were impacted by 19 mm diameter ogive nosed projectiles. The caliber radius head (CRH) of ogive nosed projectile was varied (0, 0.5, 1, 1.58, 2, 2.5) and found to have significant effect on the ballistic limit of 1 mm thick 1100-1-112 aluminum target. The ballistic limit of 1 mm thick 1100-H12 aluminum target increased as the CRH increased from 0 to 0.5 and with further increase in CRH to 1.0, 1.5, 2.0 and 2.5 its values were found to drop quite significantly in case of normal impact as well as oblique impact. To study the effect of target obliquity 1 mm thick 1100-1-112 aluminum target was impacted by 19 mm diameter projectiles with six different CRH i.e. 0, 0.5, 1.0, 1.5, 2.0 and 2.5 at angle of obliquity 0°, 15°, 30°, 45° and 60° obliquity or until the occurrence of projectile ricochet. The ballistic limit of the target was obtained corresponding to each angle of obliquity and projectile nose shape. The ballistic limit was found to increase with an increase in the angle of target obliquity. The variation of critical angle of ricochet with different CR1-1 and impact velocity was also studied. It was found that the critical angle of ricochet is maximum for 0 CRH and minimum for 0.5, 1 CR1-I and further increased for 1.58, 2, 2,5 CRH projectile. ABAQUS/Explicit finite element code was used to carry out the numerical analysis.