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Discussion of the thermodynamics associated with the flow processes in hypervelocity cratering. Based on an evaluation of release temperatures and phases of nine metals as a function of shock strength conducted at Los Alamos, and on data on release temperature as a function of maximum shock pressure, calculations are made indicating that a quantitative evaluation of the effects of heating in an impact process requires a detailed knowledge of the maximum shock pressures as a function of position within the target. Such an evaluation is made for an aluminum projectile impacting on an aluminum target at 20 km/sec. It is shown that the heating effects enhance the validity of the hydrodynamic model and must be considered in any theoretical prediction of an impact crater.
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