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Determining the stress level of monotonic plastically pre-hardened metal sheets using the spherical instrumented indentation technique

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Abstract

In this paper, a methodology, for calculating the stress level of monotonic plastically pre-hardened materials, using the instrumented indentation technique (IIT) coupled to the inverse analysis technique (IAT) is presented. In this methodology, the Voce work-hardening law is always considered as the work hardening law of the studied material. This methodology has shown a very good efficiency in determining the stress levels and the plastic strains undergone by two pre-hardened pseudo-materials. That was encouraging for applying this methodology on real metal sheets. Three metal sheets were studied (DC01 and DP600 steels and aluminum alloy 2017). In the case of the as-received sheets, the identified laws show precise results for plastic strains between 3 % and 6 % which correspond approximately to the representative strain in the case of spherical indentation. Tensile samples were then pre-hardened by imposing a monotonic plastic strain. Three levels of plastic pre-strains were imposed. Concerning low pre-hardening levels, very satisfying results were obtained where this methodology showed a great efficiency in determining the stress level and the plastic pre-strain undergone by the pre-hardened sheet. For high pre-hardening levels, a small under-estimation of the stress level and the plastic pre-strain was obtained. In this latter case, work is being carried out to improve the results by enriching the experimental data provided for the inverse analysis computations.

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Authors and Affiliations

  1. CTA-BRP-UdeS, 3000 Boulevard de l’université, Sherbrooke, QC, J1K 0A5, Canada

    Mohamad Idriss

  2. Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada

    Mohamad Idriss

  3. Univ Rennes 1, LGCGM-EA 3913, F-35000, Rennes, France

    Olivier Bartier, Gérard Mauvoisin & Xavier Hernot

Authors
  1. Mohamad Idriss
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  2. Olivier Bartier
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  3. Gérard Mauvoisin
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  4. Xavier Hernot
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Corresponding author

Correspondence to Mohamad Idriss.

Additional information

Recommended by Associate Editor Sang-Hee Yoon

Mohamad Idriss received his M.S. degrees from the Lebanese University-Lebanon and INSA de Rennes-France. He received his Ph.D. from University of Rennes 1-France. He is currently a post-doctoral fellow at CTA-BRP-UdeS (Canada). His main research interests include Numerical simulations; Mechanical behavior of materials; Inverse analysis; Adhesive bonding; Laser welding.

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Idriss, M., Bartier, O., Mauvoisin, G. et al. Determining the stress level of monotonic plastically pre-hardened metal sheets using the spherical instrumented indentation technique. J Mech Sci Technol 33, 183–195 (2019). https://doi.org/10.1007/s12206-018-1218-1

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  • DOI: https://doi.org/10.1007/s12206-018-1218-1

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