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Calculations of forming limit diagrams

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Abstract

The right-hand side of the forming limit diagram (FLD) was calculated using a Marciniak-Kuczynski analysis with a nonquadratic anisotropic yield criterion. Effects of changing the strain-hardening exponent, n, strain-rate exponent, m, strain ratio, R, stress exponent in the anisotropic yield criterion, a, and the inhomogeneity factor, f, were explored. For a ≥ 6, the effect of R is negligible. The calculated forming limit for plane strain is raised by increased values of n, m, and f and is unaffected by R and a. The slope of the right-hand side is decreased by increased values of n, m, and a, whereas the slope increases with higher f The calculated FLDs agree well with experimental ones determined by in-plane stretching.

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Authors and Affiliations

  1. Institute Argentino de Siderurgia, Carlos Maria Delia Paolera 226, 1104, Buenos Aires, Argentina

    Alejandro Graf (Graduate Student)

  2. Department of Materials Science and Engineering, University of Michigan, Dow Building, 48109-2136, Ann Arbor, MI

    William F. Hosford (Professor)

Authors
  1. Alejandro Graf
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  2. William F. Hosford
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Graf, A., Hosford, W.F. Calculations of forming limit diagrams. Metall Trans A 21, 87–94 (1990). https://doi.org/10.1007/BF02656427

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