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Research Papers

Constitutive Behavior of AA5754 Sheet Materials at Large Strains

[+] Author and Article Information
Jidong Kang

School of Welding Engineering Technology, Northern College, 140 Government Road East, Kirkland Lake, ON, P2N 3L8, Canada

David S. Wilkinson

P. D. Wu, Mike Bruhis, Mukesh Jain, J. David Embury

Faculty of Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada

Raja K. Mishra

 General Motors Research and Development Center, Mail Code 480-106-212, 30500 Mound Road, Warren, MI 48090-9055

J. Eng. Mater. Technol 130(3), 031004 (May 22, 2008) (5 pages) doi:10.1115/1.2931151 History: Received June 29, 2007; Revised December 06, 2007; Published May 22, 2008

The constitutive behavior of both direct-chill cast (DC) and continuous cast (CC) AA5754 sheet materials has been investigated up to large strains using a modified shear test. The modified shear sample prevents rotation of the shear zone compared to the ASTM standard B831 test (2005, “Standard Test Method for Shear Testing of Thin Aluminum Alloy Products  ,” 2005 Annual Book of ASTM Standards, West Conshohocken, PA, Vol. 02.02, pp. 601–603). The results show that the effective stress and effective strain curves from shear tests match those obtained from uniaxial tension, but only by incorporating the material anisotropy using the Barlat–Lian yield function. The flow stresses of both materials saturate at large strains; however, the fracture strain of the CC material is significantly lower than that of the DC material.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

An ASTM B831 modified sample geometry for planar simple shear test

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Figure 2

Shear strain distribution in (a) DC and (b) CC materials at maximum loading using the digital image correlation method. Shear strains are defined as shear angles.

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Figure 3

Shear stress–shear strain curves for (a) DC and (b) CC materials, derived using modified ASTM B831 sample

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Figure 4

Effective uniaxial stress–effective strain curves of (a) DC and (b) CC materials

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Figure 5

Damage in uniaxial tensile samples near the fracture surfaces. Samples are sectioned and matched to show the remaining thickness and radius at fracture points to be used in σf calculations.

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