Homogenization method for strength and inelastic behavior of nanocrystalline materials

L. Capolungo, C. Jochum, M. Cherkaoui, J. Qu

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Abstract

Homogenization techniques are used for modeling the so-called "breakdown" of the Hall-Petch law in the case of nanocrystalline (NC) materials. In this paper, the NC material is modeled as a composite material composed of two phases: the grain core (inclusion) and the grain boundaries (matrix). The deformation of the inclusion phase has a viscoplastic component that takes into account the dislocation glide mechanism as well as Coble creep. The boundary phase is modeled as an amorphous material with a perfect elastic-plastic behavior. An application of the model is developed on pure copper under tensile load. The results are compared with various experimental data.

Original languageEnglish
Pages (from-to)67-82
Number of pages16
JournalInternational Journal of Plasticity
Volume21
Issue number1
DOIs
StatePublished - Jan 2005

Keywords

  • Composite materials
  • Hall-Petch
  • Homogenization
  • Nanocrystalline materials

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