Visco-plastic model with time retardation for high-velocity impact loading of OFE copper specimens

Abstract eng:
OFE copper (Oxygen Free Electronic copper) is extensively used in military engineering for the design of shape charge warheads. Use is made of its excellent deformation capabilities to initiate a metal jet for the target penetration moving with the speed of several kilometres per second. Gray and Follansbee (1988) conducted unique experiments with OFE copper specimens subject to such extreme loading conditions. Controversial results were obtained that could not be explained by any existing visco-plastic theory. The authors of this paper made an attempt at an explanation by introducing a specific viscoplastic model with time retardation. In the present work the model was cast to the format of the standard continuum mechanics equations.

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