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.
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April 1986
Research Papers
Transient Small-Scale Yield Behavior of Textured Copper Tubing Under Biaxial Loading
Hamid Garmestani,
Hamid Garmestani
Cornell University, Ithaca, NY 14850
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Brent L. Adams
Brent L. Adams
Brigham Young University, Provo, UT 84602
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Hamid Garmestani
Cornell University, Ithaca, NY 14850
Brent L. Adams
Brigham Young University, Provo, UT 84602
J. Eng. Mater. Technol. Apr 1986, 108(2): 127-134 (8 pages)
Published Online: April 1, 1986
Article history
Received:
August 20, 1984
Online:
September 15, 2009
Citation
Garmestani, H., and Adams, B. L. (April 1, 1986). "Transient Small-Scale Yield Behavior of Textured Copper Tubing Under Biaxial Loading." ASME. J. Eng. Mater. Technol. April 1986; 108(2): 127–134. https://doi.org/10.1115/1.3225849
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