Abstract
A velocity interferometer system for any reflector (VISAR)is used to measure the sound velocity of LY12 Alshock-compressed to peak pressures of 20, 32, 55 and 71 GPa. Unloadingwave velocities from these pressures are obtained from theobserved particle velocity profiles at the LY12 Al/LiF windowinterface; and the longitudinal, bulk and shear sound velocities at theinitial Hugoniot state are well determined. The histories ofstress, strain, density or volume, and particle velocity along therelease paths are calculated by the impedance-matching method based onthe unloading sound velocity data. It is revealed that the releasebehaviour of shocked LY12 Al departures obviously from the elasticperfectly-plastic response.
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