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JOM

, Volume 70, Issue 6, pp 906–911 | Cite as

Split-Ring Springback Simulations with the Non-associated Flow Rule and Evolutionary Elastic-Plasticity Models

  • K. J. Lee
  • Y. Choi
  • H. J. Choi
  • J. Y. Lee
  • M. G. Lee
Shaping & Forming of Advanced High Strength Steels
  • 112 Downloads

Abstract

Finite element simulations and experiments for the split-ring test were conducted to investigate the effect of anisotropic constitutive models on the predictive capability of sheet springback. As an alternative to the commonly employed associated flow rule, a non-associated flow rule for Hill1948 yield function was implemented in the simulations. Moreover, the evolution of anisotropy with plastic deformation was efficiently modeled by identifying equivalent plastic strain-dependent anisotropic coefficients. Comparative study with different yield surfaces and elasticity models showed that the split-ring springback could be best predicted when the anisotropy in both the R value and yield stress, their evolution and variable apparent elastic modulus were taken into account in the simulations. Detailed analyses based on deformation paths superimposed on the anisotropic yield functions predicted by different constitutive models were provided to understand the complex springback response in the split-ring test.

Notes

Acknowledgements

MGL appreciates the support from the National Research Foundation of Korea (NRF) (2017R1A2A2A05069619) and (2012R1A5A1051500).

Supplementary material

11837_2018_2812_MOESM1_ESM.pdf (889 kb)
Supplementary material 1 (PDF 888 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • K. J. Lee
    • 1
    • 2
  • Y. Choi
    • 1
    • 2
  • H. J. Choi
    • 1
    • 2
  • J. Y. Lee
    • 1
    • 2
  • M. G. Lee
    • 1
  1. 1.Department of Materials Science and Engineering & RIAMSeoul National UniversitySeoulSouth Korea
  2. 2.Department of Materials Science and EngineeringKorea UniversitySeoulSouth Korea

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