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Large strain mechanical behavior of 1018 cold-rolled steel over a wide range of strain rates

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Abstract

The large-strain constitutive behavior of cold-rolled 1018 steel has been characterized at strain rates ranging from \(\dot \varepsilon = 10^{ - 3} \) to 5 × 104 s−1 using a newly developed shear compression specimen (SCS). The SCS technique allows for a seamless characterization of the constitutive behavior of materials over a large range of strain rates. The comparison of results with those obtained by cylindrical specimens shows an excellent correlation up to strain rates of 104 s−1. The study also shows a marked strain rate sensitivity of the steel at rates exceeding 100 s−1. With increasing strain rate, the apparent average strain hardening of the material decreases and becomes negative at rates exceeding 5000 s−1. This observation corroborates recent results obtained in torsion tests, while the strain softening was not clearly observed during dynamic compression of cylindrical specimens. A possible evolution scheme for shear localization is discussed, based on the detailed characterization of deformed microstructures. The Johnson-Cook constitutive model has been modified to represent the experimental data over a wide range of strain rates as well as to include heat-transfer effects, and model parameters have been determined for 1018 cold-rolled steel.

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Author notes

  1. M. Vural (Visiting Associate in Aeronautics, Assistant Professor of Mechanical and Aerospace Engineering)

    Present address: the Graduate Aeronautical Laboratories, California Institute of Technology, 91125, Pasadena, CA

Authors and Affiliations

  1. California Institute of Technology, 91125, Pasadena, CA

    M. Vural (Visiting Associate in Aeronautics, Assistant Professor of Mechanical and Aerospace Engineering) & G. Ravichandran (Professor of Aeronautical and Mechanical Engineering)

  2. the MMAE Department, Illinois Institute of Technology, 60616, Chicago, IL

    M. Vural (Visiting Associate in Aeronautics, Assistant Professor of Mechanical and Aerospace Engineering)

  3. the Graduate Aeronautical Laboratories, California Institute of Technology, 91125, Pasadena, CA

    D. Rittel (Associate Professor of Mechanical Engineering)

Authors
  1. M. Vural
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  2. G. Ravichandran
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  3. D. Rittel
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Vural, M., Ravichandran, G. & Rittel, D. Large strain mechanical behavior of 1018 cold-rolled steel over a wide range of strain rates. Metall Mater Trans A 34, 2873–2885 (2003). https://doi.org/10.1007/s11661-003-0188-8

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  • DOI: https://doi.org/10.1007/s11661-003-0188-8

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