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RESEARCH PAPERS

Transient Small-Scale Yield Behavior of Textured Copper Tubing Under Biaxial Loading

[+] Author and Article Information
Hamid Garmestani

Cornell University, Ithaca, NY 14850

Brent L. Adams

Brigham Young University, Provo, UT 84602

J. Eng. Mater. Technol 108(2), 127-134 (Apr 01, 1986) (8 pages) doi:10.1115/1.3225849 History: Received August 20, 1984; Online September 15, 2009

Abstract

Biaxial microplastic yielding (8 microstrain) of 101 copper tubing was studied at room temperature to assess the transient time-dependent behavior of subsequent yielding following small prestrains (2000 microstrain). The specimens investigated were thin-walled tubes loaded in variable combinations of uniaxial tension/compression and internal pressurization. Prestraining in three different directions introduced a Bauschinger effect as manifested by a translation of the yield surface in the direction of stressing. The yield surface also showed an expansion in size. Subsequent yield surfaces, measured at other time intervals, showed that the Bauschinger effect recovered up to 90 percent after 120 hours, and the final yield locus retained the same shape anisotropy as the initial surface. This implies a shift from kinematic to isotropic hardening. Hart’s phenomenological model was used to predict the experimental data. In this model, the Bauschinger effect and other shape changes of the yield surface are attributed to anelastic phenomena.

Copyright © 1986 by ASME
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