A deformation mechanism map for polycrystals modeled using strain gradient plasticity and interfaces that slide and separate

Carl F.O. Dahlberg, Jonas Faleskog, Christian Frithiof Niordson, Brian Nyvang Legarth

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Small scale strain gradient plasticity is coupled with a model of grain boundaries that take into account the energetic state of a plastically strained boundary and the slip and separation between neighboring grains. A microstructure of hexagonal grains is investigated using a plane strain finite element model. The results show that three different microstructural deformation mechanisms can be identified. The standard plasticity case in which the material behaves as expected from coarse grained experiments, the nonlocal plasticity region where size of the microstructure compared to some intrinsic length scale enhances the yield stress and a third mechanism, active only in very fine grained microstructures, where the grains deform mainly in relative sliding and separation.
Original languageEnglish
JournalInternational Journal of Plasticity
Volume43
Pages (from-to)177-195
ISSN0749-6419
DOIs
Publication statusPublished - 2013

Keywords

  • Strain gradient plasticity
  • Size-effects
  • Deformation mechanisms
  • Grain boundary sliding

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