On Plastic Strain in Porous Materials

[+] Author and Article Information
M. M. Carroll

Department of Mechanical Engineering, University of California, Berkeley, Calif. 94720

J. F. Schatz, S. E. Yamada

Terra Tek, Inc., Salt Lake City, Utah 84108

J. Appl. Mech 48(4), 976-978 (Dec 01, 1981) (3 pages) doi:10.1115/1.3157770 History: Received July 01, 1980; Online July 21, 2009


The formulation of continuum theories for inelastic response usually involves the definition of plastic strains or plastic strain increments. For solid materials, these are usually defined in terms of the residual deformation resulting from a loading-unloading stress cycle. For porous materials, the residual deformation may involve both irreversible and reversible deformation mechanisms in the solid matrix. We treat the special case of hydrostatic response of dry or fluid-saturated isotropic porous materials and we show that a particular definition of the plastic volume strain increment isolates the irreversible deformation mechanism, thereby making it perhaps the most useful definition for theoretical purposes.

Copyright © 1981 by ASME
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