HYPERVELOCITY PROJECTION TECHNIQUES AND IMPACT STUDIES JANUARY 1959 - JUNE 1960
NAVAL RESEARCH LAB WASHINGTON DC
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A program was initiated to obtain terminal ballistic data for masses up to five grams starting at velocities of 4.6 kmsec and extending into the hypervelocity region as far as possible. Terminal ballistic data was obtained using aluminum and tungsten carbide projectiles at velocities from near zero to 6.4 kmsec. Both conventional powder guns and light-gas guns were used to obtain this data. Various target materials were examined including lead, steel, copper and two kinds of aluminum, 1100 F and 2014-T6. The data show that for the velocity range and materials considered, the cavity shape approaches that of a hemisphere when the impact is in the hypervelocity region. Also, the ratio of impact energy to crater volume as a function of impact velocity seems to approach a constant value in the hypervelocity region for each projectile-target system except for tungsten carbide into lead.