Impact on Moving Structures and Effects of Striker Yaw and Tumbling

摘要

Three separate non-standard conditions of projectile impact and perforation ofplates were investigated experimentally and analytically. The first concerned impingement of blunt 0.25 in. dia. hard-steel cylinders on stationary thin plates of aluminum and steel at yaw angles up to 190 at velocities from 115-285 m/s. Damage was produced by bulging, lateral indentation and front and side petaling. Measurements of the ballistic limit and terminal velocity were compared with predictions of a model utilizing simplifying phenomenological assumptions. Predictions underestimated the ballistic limit by up to 14% with better correlation at higher yaw angles; they were found to be in good accord with observed final speeds. The second topic involved the effect of striker tumbling on the impact response of thin and moderately thick stationary targets of aluminum, steel and polycarbonate. The 1/2 in dia. blunt projectiles impinged the plates at longitudinal speeds from 250-700 m/s and rotational speeds up to 3600 rad/s. Perforation and post-perforation measurements, including final velocities, oblique angles and crater sizes compared well with predictions of both an analytical and a numerical model.