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Formability of AA3003 brazing sheet at elevated temperatures: limiting dome height experiments and determination of forming limit diagrams

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Abstract

Warm forming has some important advantages, the most significant being that forming limit strains increase at elevated temperatures. To quantify this advantage for an AA3003 brazing sheet, forming limit diagrams were determined using warm tooling developed to perform limiting dome height (LDH) experiments together with a digital image correlation (DIC) system used to perform in situ strain measurement. Forming limit curves (FLCs) were developed at several temperature levels and strain-rates. The formability experiments demonstrated that while temperature has a significant effect on formability, forming speed has a mild effect within the studied range. Elevating the temperature to 250 °C improved the formability more than 200 % compared to room temperature forming while forming at lower speeds increased the limiting strains by 10 % and 17 % at room temperature and 250 °C, respectively. A comparison between FLDs developed using DIC methods versus circle grid (CG) analysis showed good agreement between the two methods; however, the degree of scatter in the CG method increased significantly for the higher temperature tests.

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Acknowledgments

Financial support for this research from Dana Canada Corporation-Power Technologies Group, the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Ontario Research Fund is gratefully acknowledged.

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  1. Mechanical and Mechatronics Engineering Department, University of Waterloo, 200 University Ave., West Waterloo, Ontario, Canada, N2L 3G1

    Reza Bagheriasl & Michael J. Worswick

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  1. Reza Bagheriasl
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  2. Michael J. Worswick
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Correspondence to Reza Bagheriasl.

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Bagheriasl, R., Worswick, M.J. Formability of AA3003 brazing sheet at elevated temperatures: limiting dome height experiments and determination of forming limit diagrams. Int J Mater Form 8, 229–244 (2015). https://doi.org/10.1007/s12289-014-1162-2

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  • DOI: https://doi.org/10.1007/s12289-014-1162-2

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