PENETRATION MECHANICS AND POST-PERFORATION EFFECTS IN AN ALUMINUM- ALUMINUM IMPACT SYSTEM
NAVAL WEAPONS CENTER CHINA LAKE CA
Pagination or Media Count:
The perforation of 0.040-, 0.125-, and 0.250-inch 2024-T3 aluminum alloy plates by 0.063-, 0.125-, and 0.281-inch 2024-T8 aluminum spheres was investigated for the impact velocity range from 1.0 to 4.0 kmsec. The object of the investigation was to determine the mechanism of the formation of fragments, the distribution of fragment velocities and sizes, and the relation of atmospheric disturbances to these properties of the fragment system. The projectiles were launched from a conventional powder gun and from a light-gas gun both of which are 0.5 inch in barrel diameter. The investigation used an Electro-Optics Kerr cell camera, paraffin and celotex techniques of particle recovery, and measurements of momentum by a ballistic pendulum. Pressures of atmospheric disturbances were estimated from highspeed photographs of the shocks and directly by piezoelectric gages mounted in the top of a box to which the target plate is mounted. Pressure measurements were found to correlate in a general way to the kinetic energy of the particle system but show no significant contribution from the combustion of aluminum in air. The pressures from 0.125- and 0.040-inch targets were essentially the same.