Grain size dependence of tensile strength of polycrystalline metals by crystal-plasticity-damage multi-scale analyses

Ikumu Watanabe, Kenjiro Terada, Masayoshi Akiyama

Research output: Contribution to journalArticlepeer-review

Abstract

This work investigates the grain size dependence of the macroscopic tensile strength of polycrystalline metals by applying the two-scale finite element method, which is based on the homogenization theory combined with the elastic-plastic-damage constitutive model for single crystal grain. The degradation of the macroscopic stiffness is realized by the damage evolution in micro scale in our two-scale finite element analysis. It is demonstrated that the tensile strengths of polycrystalline metals exhibit the Hall-Petch type dependence on the grain size and that the less ductile the corresponding material behavior the smaller the grain size. Then this work also tries to clarify the microscopic mechanisms of these grain size dependences.

Original languageEnglish
Pages (from-to)412-418
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume74
Issue number3
DOIs
Publication statusPublished - 2008 Mar

Keywords

  • Computational mechanics
  • Finite deformation theory
  • Finite element method
  • Hall-petch relationship
  • Macroscopic strength
  • Multi-scale modeling
  • Polycrystalline metals
  • Size effect

ASJC Scopus subject areas

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

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