Plate impact techniques were used to determine the dynamic response of 1.60minus;g/cm3porous 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 0.6minus;7.3 GPa (6minus;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 Mieminus;Gruuml;neisen equation of state.
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