A dislocation density based strain gradient model

Steffen Brinckmann, Thomas Siegmund*, Yonggang Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

Strain gradients play a vital role in the prediction of size-effects in the deformation behavior of metals at the micrometer scale. At this scale the behavior of metals strongly depends on the dislocation distribution. In this paper, a dislocation density based strain gradient model is developed aiming at predictions of size-effects for structural components at this scale. For this model, the characteristic length is identified as the average distance of dislocation motion, which is deformation dependant and can be determined experimentally. The response of the model is compared to the strain gradient plasticity model of Huang et al. [Huang, Y., Qu, S., Hwang, K.C., Li, M., Gao, H., 2004. A conventional theory of mechanism-based strain gradient plasticity. Int. J. Plasticity 20, 753-782]. It is shown that the present strain gradient model, which only requires a physically measurable length-scale, can successfully predict size effects for a bar with an applied body force and for void growth.

Original languageEnglish (US)
Pages (from-to)1784-1797
Number of pages14
JournalInternational journal of plasticity
Volume22
Issue number9
DOIs
StatePublished - Sep 1 2006

Keywords

  • Dislocation
  • Materials length
  • Plasticity
  • Size effect
  • Strain gradient

ASJC Scopus subject areas

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

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