STRESS RELAXATION IN THE SHOCK COMPRESSION OF SOLIDS
Technical rept. 6 Dec 1965-15 Mar 1967
STANFORD RESEARCH INST MENLO PARK CA
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Nonsteady-state behavior in the early stages of one-dimensional shock propagation was investigated. This behavior has been termed stress relaxation. The work consisted of an experimental phase and a theoretical-computational phase. In the experimental phase, stress-time profiles resulting from impact by a gas-gun projectile were observed in hard and soft 2024 aluminum and in polyethylene at various distances from the plane of impact. In the theoretical and computational phase, several mathematical models of stress relaxation were developed. Computations based on these models have been performed by the method of characteristics and by the artificial viscosity method of von Neumann and Richtmyer. It has been found that the two-parameter model of stress relaxation predicts the experimental results more closely than does the one-parameter model.