An Investigation Of Spray Velocity Resulting From High Velocity Penetration Of Thin Plates By Disks PDF Download

An analysis based on one-dimensional shock-wave theory is presented to study the maximum velocity of the spray emanating from the rear surface of a thin meteoroid bumper. A set of experiments was designed to evaluate the analytical results. The targets used were 0.0025-cm-thick 11 aluminum foil and 0.041-cm-thick 1100 H14 aluminum plate. The projectiles used were made of tungsten and were disk shaped, 0.56 cm in diameter, and either 0.076 cm or 0.038 cm in thickness. The target and projectile dimensions used in the experiments insured that the one-dimensional assumptions used in the theory were valid. In addition, using a very dense tungsten projectile to impact the aluminum targets produced aluminum spray velocities well in excess of the tungsten projectile velocity. With this technique, the projectile and target materials were clearly differentiable in the spray. The experiments were conducted in the impact velocity range of 0.089 to 0.295 cm/micronsec. The ratio of maximum target-material spray velocity to projectile impact velocity is defined and is plotted against projectile impact velocity. The ratio predicted by using the theory agrees well with the experimental results in the range of impact velocities investigated. Representative series of photographs are presented and analyzed for the experiments conducted in both thicknesses of aluminum targets.