On Practical Forming Limits in Superplastic Forming of Aluminum Sheet |
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Authors: | Yingbing Luo Craig Miller George Luckey Peter Friedman Yinghong Peng |
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Affiliation: | (1) School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China;(2) Ford Research and Innovation Center, 2101 Village Rd, Dearborn, MI 48124, USA |
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Abstract: | In this paper, the superplastic forming (SPF) potential of two fine-grained 5083 aluminum alloys were studied under various
stress states with the use of both high temperature tensile testing and pneumatic bulge testing. Experiments with the pneumatic
bulge test were performed at temperatures ranging from 475 to 525 °C under three different strain paths ranging from equi-biaxial
to approaching plane strain. The effects of temperature on total elongation, m-value, final thickness distribution, dome height, and cavitation were investigated for the case of uniaxial and equi-biaxial
stretching. Increased temperature in bulge forming was found to improve the thickness distribution in the formed parts, but
did not have a significant effect on dome height. The shape of the forming limit diagram (FLD) was found to be significantly
different than that of FLDs commonly used in room temperature stamping. Results indicate that determination of forming limits
in SPF cannot be represented with a simple FLD and additional metrics such as external thinning and internal cavitation need
to be considered to determine a material’s SPF potential.
This article was presented at Materials Science & Technology 2006, Innovations in Metal Forming symposium held in Cincinnati,
OH, October 15-19, 2006. |
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Keywords: | AA5083 cavitation forming limit superplastic forming |
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