Cyclic Plasticity for Nonproportional Paths: Part 1—Cyclic Hardening, Erasure of Memory, and Subsequent Strain Hardening Experiments

[+] Author and Article Information
H. S. Lamba

International Harvester, Hinsdale, Ill.

O. M. Sidebottom

Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, Ill.

J. Eng. Mater. Technol 100(1), 96-103 (Jan 01, 1978) (8 pages) doi:10.1115/1.3443456 History: Received January 31, 1977; Revised July 30, 1977; Online August 17, 2010


Extensive experiments were conducted on annealed copper under cyclic nonproportional strain histories. After cyclically stabilizing the material by uniaxial cycling, out-of-phase axial-shear strain cycling for the same effective strain range caused additional increases in stress amplitudes to restabilized levels. Following cyclic stabilization of the material under out-of-phase cycling, a cycle whose effective strain amplitude was comparable to those of previous cycles resulted in stress-strain behavior unique to that cycle and independent of prior stable deformation. The experimental verification of this material property, which has been the subject of much conjecture, allowed the design of a fundamental class of experiments that determined the subsequent yield surface and strain hardening behavior from only one specimen.

Copyright © 1978 by ASME
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