A study of microindentation hardness tests by mechanism-based strain gradient plasticity

Y. Huang, Z. Xue, H. Gao, W. D. Nix, Z. C. Xia

Research output: Contribution to journalArticlepeer-review

187 Scopus citations


We recently proposed a theory of mechanism-based strain gradient (MSG) plasticity to account for the size dependence of plastic deformation at micron- and submicron-length scales. The MSG plasticity theory connects micron-scale plasticity to dislocation theories via a multiscale, hierarchical framework linking Taylor's dislocation hardening model to strain gradient plasticity. Here we show that the theory of MSG plasticity, when used to study micro-indentation, indeed reproduces the linear dependence observed in experiments, thus providing an important self-consistent check of the theory. The effects of pileup, sink-in, and the radius of indenter tip have been taken into account in the indentation model. In accomplishing this objective, we have generalized the MSG plasticity theory to include the elastic deformation in the hierarchical framework.

Original languageEnglish (US)
Pages (from-to)1786-1796
Number of pages11
JournalJournal of Materials Research
Issue number8
StatePublished - Aug 2000

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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