Anisotropic Hardening Rule for Presheared Clay under a Constant Mean-Stress Condition
Publication: International Journal of Geomechanics
Volume 14, Issue 6
Abstract
This paper suggests that the isotropic hardening rule with a modified hardening parameter can be used to simulate anisotropic hardening behavior from both theoretical and experimental viewpoints. It is believed that the isotropic hardening rule cannot simulate anisotropic hardening behavior mainly because its yield function is expressed in terms of the principal stresses and its hardening parameter is expressed in terms of the principal plastic strains. Contrary to this belief, the first part of this paper theoretically suggests that the isotropic hardening rule with a modified hardening parameter, expressed in terms of the plastic strains in the coordinate system defined by the principal stress axes, can simulate anisotropic hardening behavior. In the second part of this paper, it is experimentally shown that the isotropic hardening rule with the modified hardening parameter can simulate the actual anisotropic hardening behavior of presheared clay. The second part also discusses the microscopic mechanism of the hardening for the presheared clay with reference to the isotropic hardening rule with the modified hardening parameter.
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Acknowledgments
The author thanks Professor S. Miura at Hokkaido University, Professor Y. Tobita at Tohoku Gakuin University, and Dr. S. Nishimura at Hokkaido University for their advice and gracious help.
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Published In
International Journal of Geomechanics
Volume 14 • Issue 6 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 28, 2013
Accepted: Oct 30, 2013
Published online: Nov 4, 2013
Discussion open until: Sep 1, 2014
Published in print: Dec 1, 2014
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