INVESTIGATION OF SECOND ORDER ELASTIC PROPERTIES OF VARIOUS MATERIALS.
TEXAS UNIV AUSTIN DEPT OF PHYSICS
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The finite elastic theory of Murnaghan was applied to the problem of calculating dilatational and shear velocities through solids as a function of hydrostatic pressure and simple axial stress. Experiments were performed on three materials polystyrene, Armco iron, and pyrex glass. The results of the theory were checked within experimental error, and three constants appearing in Murnaghans theory were determined for these three materials. Pulse techniques were used to measure the velocities. For measurements under hydrostatic pressure, the method developed by Hughes, Pandrom, and Mims was used to obtain both dilatational and shear velocities with one experimental arrangement. For measurement of velocities under a simple axial stress, x-cut and y-cut crystals were used to obtain the two types of velocities. Results were good for the polystyrene, fair for the iron, and poor for the pyrex. The main limitation in the method arises from failure of the samples in the case of axial stress before measurable velocity changes are observed. Author