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On Practical Forming Limits in Superplastic Forming of Aluminum Sheet

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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.

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Authors and Affiliations

  1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China

    Yingbing Luo & Yinghong Peng

  2. Ford Research and Innovation Center, 2101 Village Rd, Dearborn, MI, 48124, USA

    Yingbing Luo, Craig Miller, George Luckey & Peter Friedman

Authors
  1. Yingbing Luo
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  2. Craig Miller
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  3. George Luckey
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  4. Peter Friedman
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  5. Yinghong Peng
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Correspondence to Yingbing Luo.

Additional information

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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Luo, Y., Miller, C., Luckey, G. et al. On Practical Forming Limits in Superplastic Forming of Aluminum Sheet. J. of Materi Eng and Perform 16, 274–283 (2007). https://doi.org/10.1007/s11665-007-9048-9

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  • DOI: https://doi.org/10.1007/s11665-007-9048-9

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