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RESEARCH PAPERS

Investigation of Endochronic Constitutive Equation Subject to Plastic Strain-Controlled Axial-Torsional Deformation

[+] Author and Article Information
Han C. Wu, J. C. Yao, S. C. Chu

Department of Civil Engineering, The University of Iowa, Iowa City, Iowa 52242

J. Eng. Mater. Technol 108(3), 262-269 (Jul 01, 1986) (8 pages) doi:10.1115/1.3225879 History: Received April 22, 1985; Online September 15, 2009

Abstract

Plastic-strain controlled test is investigated both experimentally and theoretically. The plastic-strain control is feasible by means of computer-aided material test system. Theoretical study is made by use of the modified endochronic theory in which plastic strain is employed to define intrinsic time. Three in-phase plastic-strain paths (a pure axial path, a pure torsional path and an axial-torsional in-phase path) and two out-of-phase plastic-strain paths (small and large perturbations from the axial-torsional in-phase path) are studied. It is shown that the theory and experiment have good agreement. Furthermore, both experimental and theoretical results show that strain-hardening is enhanced by out-of-phase loading.

Copyright © 1986 by ASME
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