THE DYNAMIC COMPRESSIBILTIY OF SOLIDS FROM SINGLE EXPERIMENTS USING LIGHT REFLECTION TECHNIQUES
NAVAL ORDNANCE LAB WHITE OAK MD
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An experimental technique was developed to determine in a single experiment the dynamic compressibility of a solid over a relatively large pressure range. The method consists of observing with a rotating-mirror smear camera, the behavior of the free surface of a wedge of the test material shortly after the opposite wedge surface has been struck by a plane, explosive-driven shock wave. Reflected light, shock luminescence, and the spallation of plastic films from shocked wedge surfaces are employed. Using one-dimensional geometry, shock and free-surface velocities are measured as a function of a wedge thickness. The data are treated with the pertinent hydrodynamic equations to obtain the compressibility curve. The results of measurements on the compression of aluminum and Plexiglas in the pressure region of 70 to 300 kilobars are presented.