SHOCK COMPRESSION OF PLEXIGLAS AND POLYSTYRENE
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Hugoniot curves for Plexiglas and polystyrene were established experimentally using optical and polarization techniques. Both Hugoniots show evidence of a phase transition, although the polystyrene transition is more clearly defined than that of Plexiglas. Separate polarization studies support the existence of both transitions. At the transitions, it is noted that the rarefaction velocity becomes equal to the shock velocity. The nature of the transitions is presently unknown.