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A viscoplastic model based on a variable strain rate sensitivity index for superplastic sheet metals

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Abstract

This paper presents a new phenomenological model for describing the main features of the viscoplastic behavior of superplastic sheet metals, namely, strain hardening, softening, and damage. The proposed model is based on a variable strain rate sensitivity index (m-value) measured from uniaxial tensile tests at different strain rates under constant temperature. In this study, the uniaxial tensile tests were carried out at three strain rates (i.e., 10−3, 10−2, and 10−1 s−1) on a superplastic grade AA5083 aluminum sheet alloy. In addition, the volume fractions of cavities at different plastic strain levels were assessed using X-ray microtomography. The performance of the model was investigated by comparing its predictions with the experimental data. In addition, the model was validated with two sets of reference data for AA5083 aluminum alloy and AZ31 magnesium alloy. In particular, it was observed that the new model could predict the flow behavior of these metals more successfully compared with two reference models; nevertheless, it requires minimal experimentation and calculation efforts.

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Acknowledgments

The tensile tests were carried out at the National Research Council Canada Aluminum Technology Center NRC-ATC. The authors would like to thank Dr. Ehab Samuel from NRC-ATC for his invaluable support. Financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC), Innovation en Énergie Électrique (INOVÉE), and Aluminium Association of Canada (AAC) are acknowledged by all the authors.

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Authors and Affiliations

  1. Department of Mechanical Engineering, École de technologie supérieure (ÉTS), Montreal, QC, H3C 1K3, Canada

    Omid Majidi & Mohammad Jahazi

  2. Verbom Inc., 5066 Route 222, C. P. 3240, Valcourt, QC, J0E 2L0, Canada

    Nicolas Bombardier

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  1. Omid Majidi
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  2. Mohammad Jahazi
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  3. Nicolas Bombardier
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Correspondence to Omid Majidi.

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Majidi, O., Jahazi, M. & Bombardier, N. A viscoplastic model based on a variable strain rate sensitivity index for superplastic sheet metals. Int J Mater Form 12, 693–702 (2019). https://doi.org/10.1007/s12289-018-1443-2

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  • DOI: https://doi.org/10.1007/s12289-018-1443-2

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