An evaluation method of macroscopic yield strength for polycrystalline metals subjected to plastic forming by micro-macro decoupling analysis

Ikumu Watanabe, Kenjiro Terada

Research output: Contribution to journalArticlepeer-review

Abstract

We introduce a method of predicting macroscopic yield strength of polycrystalline metals subjected to plastic forming by applying the micro-macro decoupling analysis method. The macroscopic plastic forming problem is assumed to be a three-stage forming process and is simulated with a single finite element in this study. At the same time, a polycrystalline aggregate composed of several crystal grains is adopted as a microstructure and is regarded as a numerical specimen for numerical material tests based on the homogenization theory. After simulating the macro-scale forming process with macroscopic approximate constitutive model, we apply the resulting macroscopic deformation histories to the microstrcutre to obtain the numerical specimen that enables us to evaluate the post-forming yield strengths. By performing the equivalent micro-macro coupling analysis and comparing the results with those by the coupling method, we demonstrate the capability of the proposed method in predicting the anisotropy in the macroscopic yield strength.

Original languageEnglish
Pages (from-to)752-760
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume76
Issue number766
DOIs
Publication statusPublished - 2010 Jun

Keywords

  • Anisotropy
  • Homogenization method
  • Micro-Macro analysis
  • Plastic forming
  • Polycrystalline metals
  • Yield strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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