DWELL AND POST-DWELL PENETRATION OF LONG RODS ON BOROSILICATE GLASS TARGETS.

We have been investigating the impact response of transparent materials during the last several years. We conducted long-rod impact experiments into a borosilicate glass and measured penetration and rod consumption velocities as a function of impact velocity. Additional experiments have now been conducted to investigate dwell and post-dwell response. At sufficiently low impact velocities (∼450 m/s), the glass target resists penetration, and there is dwell. If a copper buffer is placed over the glass to attenuate the impact shock and provide ramp loading, complete interface defeat can be observed for impact velocities up to 890 m/s. It was found for sustained dwell that there can be erosion of the front surface of the glass. Further, the penetration response of the glass after the dwell-penetration transition is the same as for the experiments in which there was no dwell. [ABSTRACT FROM AUTHOR]