Cyclic Deformation and Anisotropic Constitutive Relations of Al-6061-T6 Under Biaxial Loading

[+] Author and Article Information
Hong Lin, Hamid Nayeb-Hashemi, C. A. Berg

Mechanical Engineering Department, Northeastern University, Boston, MA 02115

R. M. N. Pelloux

Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Eng. Mater. Technol 114(3), 323-330 (Jul 01, 1992) (8 pages) doi:10.1115/1.2904180 History: Received June 05, 1991; Revised November 27, 1991; Online April 29, 2008


Anisotropic cyclic stress-strain curves (CSSCs) were obtained from fully reversed cyclic tests in controlled strain on two orientations of specimens made from an Al-6061-T6 plate (along the rolling direction and perpendicular to the rolling direction). The experiments were conducted at room temperature under three loading conditions: tension/compression, pure torsion and combined tension/torsion in-phase. Based on the CSSCs data, the anisotropic constitutive relations of the material were obtained using Hill’s anisotropic plasticity theory. The coefficients in the yield function were evaluated with a 0.2 percent effective plastic strain criterion. Yield loci and flow behavior were determined for tension/torsion biaxial loading and compared to theoretical predictions. Two anisotropic effective stress-effective strain criteria obtained from the anisotropic constitutive relations were evaluated. A Von Mises type criterion correlated very well with the test data of all specimens under all loadings. The Tresca type criterion did not correlate with the test data.

Copyright © 1992 by The American Society of Mechanical Engineers
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