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Analysis of Material Work Hardening and Fracture Strains for Sheet Metal Stamping Processes

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Forming the Future

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

Experimental study of sheet material flow curves was performed using combined methods of cold rolling for prestraining material to targeted strain and then tensile testing. Experimental studies revealed that aluminum alloys show a tendency for flow curves saturation which substantially lowers work hardening of the sheet material. Performed numerical simulations of cup drawing illustrated that this effect leads to earlier material wrinkling compared to power law approximation of the flow curve. Examples of numerical simulation with Autoform software comparing the result of cup drawing for various cases of flow curve approximation are discussed in this paper. Analysis of fracture strains was performed by combined gridding and paint spraying on the sheet surface. This approach enabled measurements of local strains in the area closely adjacent to fracture without having continuous access to this area by video camera. This approach was used for sheet hole expansion, sheared edge stretchability along straight cut, hemming, and self-piercing riveting for high-strength steels and aluminum alloys.

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Author information

Authors and Affiliations

  1. Mechanical Engineering Department, Oakland University, 115 Library Dr, Rochester, MI, 48309-4401, USA

    Sergey Golovashchenko, Srecko Zdravkovic, Natalia Reinberg, Saeid Nasheralahkami & Weitian Zhou

Authors
  1. Sergey Golovashchenko
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  2. Srecko Zdravkovic
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  3. Natalia Reinberg
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  4. Saeid Nasheralahkami
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  5. Weitian Zhou
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Corresponding author

Correspondence to Natalia Reinberg .

Editor information

Editors and Affiliations

  1. The Ohio State University, Columbus, OH, USA

    Glenn Daehn

  2. Northwestern Univ, Evanston, IL, USA

    Jian Cao

  3. University of New Hampshire, Durham, NH, USA

    Brad Kinsey

  4. Technical University of Dortmund, Dortmund, Germany

    Erman Tekkaya

  5. The Ohio State University, Columbus, OH, USA

    Anupam Vivek

  6. Gifu University, Gifu, Japan

    Yoshinori Yoshida

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Golovashchenko, S., Zdravkovic, S., Reinberg, N., Nasheralahkami, S., Zhou, W. (2021). Analysis of Material Work Hardening and Fracture Strains for Sheet Metal Stamping Processes. In: Daehn, G., Cao, J., Kinsey, B., Tekkaya, E., Vivek, A., Yoshida, Y. (eds) Forming the Future. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-75381-8_231

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