Shock Wave Propagation and Attennuation in Quartz Monzonite Porphyry.
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The propagation and attenuation of shock waves in quartz monzonite were investigated to improve the understanding of the controlling parameters that influence shock wave characteristics and rock material behavior under shock loading. Four instrumented impact experiments were performed on quartz monzonite using a 4-in helium gas gun to induce a uniaxial compressive wave. Input shock pressures for the impact events ranged from 22 to 71 kb, and pulse durations ranged from 0.3 to 2.3 Us. A change in slope of the shock velocity versus particle velocity curve, observed at about 25 kb, is attributed to the onset of pore collapse. Shock data for quartz monzonite and other rocks reveal that the shock velocity versus particle velocity curve appears to shift downward with increasing porosity. The pressure versus volume hugoniot curve is concave downward, which may also have resulted from the onset of pore collapse. The pulse attenuation rate is shown to decrease with pulse duration.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
New Mexico Inst. of Ming. and Tech.