Sound Velocity and Release Behaviour of Shock-Compressed LY12 Al
YU Yu-Ying1, TAN Hua1, DAI Cheng-Da1, HU Jian-Bo1, CHEN Da-Nian2
1Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang Sichuan, 621900
2Mechanics and Materials Science Research Center, Ningbo University, Zhejiang 315211
Sound Velocity and Release Behaviour of Shock-Compressed LY12 Al
1Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang Sichuan, 621900
2Mechanics and Materials Science Research Center, Ningbo University, Zhejiang 315211
Abstract： A velocity interferometer system for any reflector (VISAR) is used to measure the sound velocity of LY12 Al shock-compressed to peak pressures of 20, 32, 55 and 71GPa. Unloading wave velocities from these pressures are obtained from the observed particle velocity profiles at the LY12 Al/LiF window interface; and the longitudinal, bulk and shear sound velocities at the initial Hugoniot state are well determined. The histories of stress, strain, density or volume, and particle velocity along the release paths are calculated by the impedance-matching method based on the unloading sound velocity data. It is revealed that the release behaviour of shocked LY12 Al departures obviously from the elastic perfectly-plastic response.
2005, Vol. 22 
