Abstract
By far, the majority of experiments which are conducted to measure material properties at high stresses through the mechanism of shock waves involve the production of plane longitudinal type disturbances. However, these conventional techniques are insufficient to calculate the complete equation of state; they yield only those volume-energy states reachable through longitudinal shock waves, namely the Hugoniot relation, PH(V,E). Temperatures on this curve cannot presently be measured but must be calculated by assuming values of other thermodynamic parameters such as the Gruneisen parameter and the specific heat [1,2]. Acoustic wave velocities at high pressure must also be calculated indirectly under similar conditions. Perhaps most significantly, however, these type of experiments provide no simultaneous knowledge of shear wave speeds in a high pressure environment even though these velocities provide some of the most direct knowledge of the earth’s interior.
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