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Hardening of A6111-T4 Aluminum Alloy at Large Strains and Its Effect on Sheet Forming Operations

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Abstract

In a number of sheet metal stamping and joining processes, the material undergoes large plastic deformation exceeding the range of plastic strain achievable in a standard tensile test prior to material plastic instability. In order to extend the range of effective strains, the multistep rolling process was employed which enabled prestraining of aluminum sheet above 2.0 of true strain. Tensile testing of rolled samples was used to identify the flow stress corresponding to the level of prestrain: By varying the prestrain level, several data points were obtained for the studied flow curve. The numerical simulation using Abaqus software for the cold rolling process of aluminum strips confirmed that majority of the strip is deformed in plane strain compression condition. Performed simulation of the LDH test determined that earlier fracture might occur if the curve obtained via rolling–tensile testing approach is used versus traditional power law approximation and Voce law approximation. The results of simulation for the multistep drawing of a cylindrical cup revealed possible wrinkling in the die entry area during redrawing stage of the process if the rolling–tensile testing flow curve is employed.

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Acknowledgments

The authors would like to thank Dr. Yevgeniya Katykova of Oakland University for her contribution to the initial phase of this work and Mr. Christopher Maris and Mr. Jia Cheng of University of Windsor for their contribution to developing experimental data on tensile performance of rolled samples.

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Authors and Affiliations

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

    Sergey Golovashchenko & Natalia Reinberg

  2. Mechanical, Automotive and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada

    Amir Hassannejadasl & Daniel Green

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  1. Sergey Golovashchenko
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  2. Natalia Reinberg
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  4. Daniel Green
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Correspondence to Natalia Reinberg.

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Golovashchenko, S., Reinberg, N., Hassannejadasl, A. et al. Hardening of A6111-T4 Aluminum Alloy at Large Strains and Its Effect on Sheet Forming Operations. J. of Materi Eng and Perform 28, 2465–2476 (2019). https://doi.org/10.1007/s11665-019-03977-5

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  • DOI: https://doi.org/10.1007/s11665-019-03977-5

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