Abstract
Plate impact techniques were used to determine the dynamic response of 1.60−g/cm3 porous aluminum at energy states approaching incipient melt. Both quartz gauge and laser interferometric techniques were used to measure the shock response of this material over the stress range 0.6−7.3 GPa (6−73 kbar), which is in the region of full compaction. In addition, a nearly complete equilibrium release curve centered at 3.07 GPa (30.7 kbar) was measured using reverberating wave techniques. This is thought to represent the first accurate measurement of a release isentrope through a fully compacted state of a distended material and allows a further test of the equation of state. It is found that both the initial compaction and the release behavior of the compacted aluminum can be accurately predicted using the Mie−Grüneisen equation of state.
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