Effect of Target Span and Projectile Nose Shape on the Ballistic Resistance

摘要

The present study is based on the three-dimensional numerical simulations wherein aluminum target plates of varying span diameter were impacted normally by hardened steel projectiles. 1 mm thick 11 OO-H 12 aluminum targets of three different free span diameters i.e. 204 mm, 255 mm and 500 mm were impacted by blunt, ogive and hemispherical nosed projectiles of 19 mm diameter and 52.5 grams mass. In each case the impact velocity of the projectile was varied to obtain the ballistic limit. Both the target span as well as the projectile nose shape were found to have significant influence on the ballistic limit. For a given projectile the ballistic limit was found to increase with an increase in the target span. For each span diameter, the target offered highest ballistic limit against hemispherical nosed projectile followed by blunt and ogive nosed projectiles respectively. Failure mode of the target was also found to be affected by the projectile nose shape as well as the target span diameter. ABAQUS/Explicit finite element code was used to carry out the numerical simulations.