Experimental Assessment of the Specific Cavitation Energy in Polycarbonate Plate Perforation

摘要

Perforation tests were conducted with various thicknesses ofrnpolycarbonate plates at normal impact by ogival-nose rigid projectilesrnwithin a striking velocity range of 500-900 m/sec. The residual velocity wasrnmeasured through the use of high-speed cameras for tracking the projectilernbefore and after perforation. The rigid projectile is subjected to thernresisting force from the surrounding medium, which is characterized byrnthe dynamic cavity expansion theory. The specific cavitation energy can bernused for estimating the ballistic limit of protective plates in which ductilernhole-formation is the dominant mode of failure. The experimental resultsrnwere found to be in good agreement with previous half space results.rnComparison with spherical cavitation analysis that includes a damagedrnzone shows also good agreement. Results are supported by several V50rntests.