Effect of Evolutionary Anisotropy on Earing Prediction in Cylindrical Cup Drawing

H. J. Choi, Kyoung Jin Lee, Y. Choi, G. Bae, D. C. Ahn, M. G. Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The formability of sheet metals is associated with their planar anisotropy, and finite element simulations have been applied to the sheet metal-forming process by describing the anisotropic behaviors using yield functions and hardening models. In this study, the evaluation of anisotropic constitutive models was performed based on the non-uniform height profile or earing in circular cylindrical cup drawing. Two yield functions, a quadratic Hill1948 and a non-quadratic Yld2000-2d model, were used under non-associated and associated flow rules, respectively, to simultaneously capture directional differences in yield stress and r value. The effect of the evolution of anisotropy on the earing prediction was also investigated by employing simplified equivalent plastic strain rate-dependent anisotropic coefficients. The computational results were in good agreement with experiments when the proper choice of the yield function and flow rule, which predicts the planar anisotropy, was made. Moreover, the accuracy of the earing profile could be significantly enhanced if the evolution of anisotropy between uniaxial and biaxial stress states was additionally considered.

Original languageEnglish
Pages (from-to)915-921
Number of pages7
JournalJOM
Volume69
Issue number5
DOIs
Publication statusPublished - 2017 May 1

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Anisotropy
Sheet metal
Metal forming
Formability
Constitutive models
Yield stress
Hardening
Strain rate
Plastic deformation
Experiments

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Effect of Evolutionary Anisotropy on Earing Prediction in Cylindrical Cup Drawing. / Choi, H. J.; Lee, Kyoung Jin; Choi, Y.; Bae, G.; Ahn, D. C.; Lee, M. G.

In: JOM, Vol. 69, No. 5, 01.05.2017, p. 915-921.

Research output: Contribution to journalArticle

Choi, H. J. ; Lee, Kyoung Jin ; Choi, Y. ; Bae, G. ; Ahn, D. C. ; Lee, M. G. / Effect of Evolutionary Anisotropy on Earing Prediction in Cylindrical Cup Drawing. In: JOM. 2017 ; Vol. 69, No. 5. pp. 915-921.
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