Effect of changing strain paths on |
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Authors: | Alejandro Graf William Hosford |
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Affiliation: | (1) Automated Analysis Corp., 48104-6767 Ann Arbor, MI;(2) Department of Materials Science and Engineering, University of Michigan, 48109-2136 Ann Arbor, MI |
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Abstract: | The effect of changing strain paths on forming limits of aluminum alloy 2008-T4 has been investigated by determining forming
limit diagrams (FLDs) after prestraining. Sheets were pre- strained to several levels in uniaxial, biaxial, and plane-strain
tension parallel and perpendicular to the prior rolling direction (RD). Abrupt changes in the strain path can be used to increase
the forming limits. Prestraining in biaxial tension generally lowers the forming limits for the entire FLD, whereas prestraining
in uniaxial tension raises the limits on the right-hand side of the FLD without much effect on the left-hand side. Prestraining
in plane-strain tension raises both sides away from the minimum. Finally, it was found that after prestraining, the amount
of the additional plane-strain deformation possible depends on the effective strain during prestrain. |
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