Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals

Ercan Gurses, Tamer S. El Sayed

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present a variational two-phase constitutive model capable of capturing the enhanced rate sensitivity in nanocrystalline (nc) and ultrafine-grained (ufg) fcc metals. The nc/ufg-material consists of a grain interior phase and a grain boundary affected zone (GBAZ). The behavior of the GBAZ is described by a rate-dependent isotropic porous plasticity model, whereas a rate-independent crystal-plasticity model which accounts for the transition from partial dislocation to full dislocation mediated plasticity is employed for the grain interior. The scale bridging from a single grain to a polycrystal is done by a Taylor-type homogenization. It is shown that the enhanced rate sensitivity caused by the grain size refinement is successfully captured by the proposed model. © 2011 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)1610-1616
Number of pages7
JournalInternational Journal of Solids and Structures
Volume48
Issue number10
DOIs
StatePublished - May 2011

ASJC Scopus subject areas

  • Mechanics of Materials
  • Modeling and Simulation
  • Materials Science(all)
  • Mechanical Engineering
  • Applied Mathematics
  • Condensed Matter Physics

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