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Strain Rate and Notch Radius Effects on Evaluating the Stress–Strain Relations Using the Stepwise Modeling Method

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Abstract

Accurate computer simulations require the selection of suitable material models and precise prediction of their parameters. In the fields of impact engineering and plastic working, stress–strain relations that include the post-necking regime up to fracture are crucial for predicting the behavior correctly. However, obtaining suitable stress–strain relations after necking requires some form of correction and adjustment for stress and/or strain. This study applies a stepwise modeling method for post-necking characterization that only utilizes the local strain field obtained from tensile experiments to precisely measure stress–strain relations at high strain rates. The effects of the notch radius of specimens on stress–strain relations were examined to measure stress–strain relations with large strain near the stress triaxiality of 1/3. The study also discusses adequate resolution for precise stress–strain measurements. Subsequently, specimens with suitable notch radius were used to measure stress–strain relations of plate specimens of aluminum alloy 2024-T3 at high strain rates. The study also examined the effects of strain rate on the flow stress and fracture strain of aluminum alloy 2024-T3.

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The data generated and/or analysed in this present study are not publicly disclosed but are available from the corresponding author on reasonable request.

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Acknowledgements

This work was partially supported by The Light Metal Educational Foundation, Inc. The microstructure observation was carried out by UACJ Corporation. The authors would like to express their gratitude for the technical and financial support.

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Authors and Affiliations

  1. Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

    S. Djebien, S. Nohara & M. Nishida

  2. Luleå University of Technology, 971 87, Luleå, Sweden

    S. Marth & H.-Å. Häggblad

  3. Swerim AB, Box 812, 971 25, Luleå, Sweden

    S. Marth

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  1. S. Djebien
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  2. S. Nohara
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  3. M. Nishida
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Correspondence to M. Nishida.

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Djebien, S., Nohara, S., Nishida, M. et al. Strain Rate and Notch Radius Effects on Evaluating the Stress–Strain Relations Using the Stepwise Modeling Method. J. dynamic behavior mater. 10, 26–39 (2024). https://doi.org/10.1007/s40870-023-00397-4

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  • DOI: https://doi.org/10.1007/s40870-023-00397-4

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