Engineering Mechanics

International Conference

Proceedings Vol. 9 (2003)


May 11 – 15, 2003, Svratka, Czech Republic
Editors: Jiří Náprstek and Cyril Fischer

Copyright © 2003 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

ISBN 80-86246-18-3 (printed, Extended Abstracts)
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)

list of papers scientific commitee

Visco-plastic model with time retardation for high-velocity impact loading of OFE copper specimens
Plešek J., Hirsch E.
pages 254 - +9p., full text

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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