PENETRATION AND PERFORATION STUDIES OF THIN GLASS TARGETS
UTAH UNIV SALT LAKE CITY HIGH VELOCITY LAB
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Steel spheres 332 inches in diameter were accelerated to velocities in the range of 0.1 to 2.5 kmsec. and impacted normally upon ordinary plate glass targets 4 inches square and 364, 116, 18, 14 and 12 inches thick. Tungsten spheres 116 inches in diameter were also impacted in the same manner as the steel spheres at velocities from 2.0 to 2.5 kmsec. into 14- and 12- inch thick glass. Steel BB shot 14 inch in diameter were impacted in the same manner as previously described into the 364-inch thickness at the 0.1 kmsec. velocity range. It was found that the kinetic energy lost by the pellet during perforation of the target was a function of the impact velocity to the second power. Therefore, parabolas could be used to approximate these curves. The plot of the minimum velocity of perforation as a function of target thickness was found to be a straight line relationship. The manner in which the energy dissipates in the glass was qualitatively explained.