Finite Strain Micromorphic Pressure-Sensitive Plasticity
Publication: Journal of Engineering Mechanics
Volume 135, Issue 3
Abstract
A finite strain micromorphic pressure-sensitive plasticity model is formulated starting with thermodynamically conjugate stresses and plastic deformation rates in the reduced dissipation inequality, written in the intermediate configuration. Isotropic linear elasticity and nonassociative Drucker–Prager plasticity with cohesion hardening/softening are assumed for the constitutive equations. The reduced dissipation inequality dictates three levels of plastic evolution: (1) evolution of , the plastic part of the deformation gradient; (2) evolution of , the plastic part of the microdeformation tensor; and (3) evolution of , the covariant derivative of . A semi-implicit time integration of the stress and plastic evolution equations is outlined after assuming small elastic deformations and Cartesian coordinates for the current configuration.
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Acknowledgments
The support of NSF Grant No. NSFCMMI-0700648 and the Army Research Laboratory are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 135 • Issue 3 • March 2009
Pages: 178 - 191
Copyright
© 2009 ASCE.
History
Received: Sep 25, 2008
Accepted: Dec 3, 2008
Published online: Mar 1, 2009
Published in print: Mar 2009
Notes
Note. Associate Editor: George Z. Voyiadjis
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