Viscoplastic Cap Model for Soils under High Strain Rate Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 2
Abstract
A viscoplastic cap model of the Perzyna type was developed for simulating high strain rate behaviors of soils. An associative viscous flow rule was used to represent time-dependent soil behaviors. The viscoplastic cap model was validated against experimental data from static and dynamic soil tests. The model was also compared with soil behaviors under creep and stress relaxation with good agreement. However, the model was unable to represent tertiary creep where strain softening became significant. The model was subsequently integrated into LS-DYNA for finite-element simulations of high strain rate behaviors of sandy and clayey soils in explosive tests. The significance of strain rate effect on the soil responses is presented herein. It is concluded that the viscoplastic cap model is adequate for simulations of soil behaviors under high strain rate loading, creep, and stress relaxation, covering a wide range of time-dependent problems.
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Acknowledgments
The sponsorship of the U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland, for this research is gratefully acknowledged. The writers wish to thank Bryan Cheeseman, George Gazonas, Brian Powers, Reed Skaggs, and Chian-Fong Yen for their collaborations and valuable feedback.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 2 • February 2007
Pages: 206 - 214
Copyright
© 2007 ASCE.
History
Received: Jun 27, 2005
Accepted: Aug 9, 2006
Published online: Feb 1, 2007
Published in print: Feb 2007
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