Forming of aluminum alloys at elevated temperatures – Part 1: Material characterization |
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| Institution: | 1. Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226, United States;2. General Motors Research & Development Center, Warren, MI 48090, United States;1. Leichtmetallkompetenzzentrum Ranshofen GmbH, Austrian Institute of Technology, Austria;2. voestalpine Polynorm GmbH & Co. KG, Germany;3. Glynd?r University, Department of Engineering and Applied Physics, United Kingdom;4. voestalpine Metal Forming GmbH, Austria;5. Aerospace & Advanced Composites GmbH, Austria;6. AIT Austrian Institute of Technology, Austria;7. Fill GmbH, Austria;8. Linde Gas GmbH, Austria;1. Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK;2. School of Mechanical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Suzhou Institute for Non-ferrous Metal Research, Suzhou 215026, China |
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| Abstract: | A temperature-dependent anisotropic material model for use in a coupled thermo-mechanical finite element analysis of the forming of aluminum sheets was developed. The anisotropic properties of the aluminum alloy sheet AA3003-H111 were characterized for a range of temperatures 25–260 °C (77–500 °F) and for different strain rates. Material hardening parameters (flow rule) and plastic anisotropy parameters (R0, R45 and R90) were calculated using standard ASTM uniaxial tensile tests. From this experimental data, the anisotropy coefficients for the Barlat YLD96 yield function Barlat, F., Maeda, Y., Chung, K., Yanagawa, M., Brem, J.C., Hayashida, Y., Lege, D.J., Matsui, K., Murtha, S.J., Hattori, S., Becker, R.C., Makosey, S., 1997a. Yield function development for aluminum alloy sheets. J. Mech. Phys. Solids 45 (11/12), 1727–1763] in the plane stress condition were calculated for several elevated temperatures. Curve fitting was used to calculate the anisotropy coefficients of Barlat’s YLD96 model and the hardening parameters as a function of temperature. An analytical study of the accuracy and usability of this curve fitting technique is presented through the calculation of plastic anisotropy R-parameters and yield function plots at different temperatures. |
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