Creep of Power-Law Material Containing Spherical Voids

[+] Author and Article Information
P. Sofronis, R. M. McMeeking

Materials Department and Mechanical Engineering Department, College of Engineering, University of California, Santa Barbara, CA 93106

J. Appl. Mech 59(2S), S88-S95 (Jun 01, 1992) doi:10.1115/1.2899512 History: Received August 16, 1990; Revised May 14, 1991; Online March 31, 2008


Finite element calculations have been carried out for spherical unit cells containing a concentric spherical hole to characterize the power law creep of a material containing voids. Axisymmetric states of macroscopic stress were applied to the unit cells ranging from purely hydrostatic loading to purely deviatoric stressing. The results of the unit cell calculations are approximated well by a creep potential for the macroscopic behavior of a porous material. This potential agrees with the unit cell results for purely hydrostatic stress and purely deviatoric stress and involves a simple elliptical interpolation in between. The model predicts quite well the ratio of transverse to axial strain rate in uniaxial compression tests.

Copyright © 1992 by The American Society of Mechanical Engineers
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