Shear Localization and Damage in AA5754 Aluminum Alloy Sheets |
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| Authors: | Jidong Kang David S. Wilkinson Mike Bruhis Mukesh Jain Pei Dong Wu J. David Embury Raja K. Mishra Anil K. Sachdev |
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| Affiliation: | (1) School of Welding Engineering Technology, Northern College, 140 Government Road East, Kirkland Lake, ON, Canada, P2N 3L8;(2) Department of Materials Science and Engineering, McMaster University, 1280 Main street West, Hamilton, ON, Canada, L8S 4L7;(3) Department of Mechanical Engineering, McMaster University, 1280 Main street West, Hamilton, ON, Canada, L8S 4L7;(4) Materials and Processes Lab, GM R&D Center, 30500 Mound Road, Warren, MI 48090-9055, USA |
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| Abstract: | In this article, we study the Portevin-Le Chatelier (PLC) bands and their influences on strain localization and fracture in continuous cast (CC) AA5754 aluminum sheets. Three types of tensile tests are conducted: (1) tensile samples are pulled directly to fracture at 223 K, (2) tensile samples are pulled at 223 K to initiate diffuse necking followed by unloading and reloading to fracture at room temperature, and (3) tensile samples are pulled at 223 K to localized necking and unloaded followed by reloading to fracture at room temperature. Furthermore, in situ V-bending test coupled with deformation mapping using digital image correlation is used to study damage at large strains. The results show that PLC bands detect favorable geometrical sites for shear band initiation. The formation of shear bands precedes damage and damage is a consequence of shear band formation. This article was presented at Materials Science & Technology 2007, Automotive and Ground Vehicles symposium held September 16-20, 2007, in Detroit, MI. |
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| Keywords: | aluminum automotive dynamic strain aging mechanical testing shear localization |
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