Mechanism-based strain gradient plasticity - I. Theory

H. Gao*, Y. Huang, W. D. Nix, J. W. Hutchinson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1499 Scopus citations


A mechanism-based theory of strain gradient plasticity (MSG) is proposed based on a multiscale framework linking the microscale notion of statistically stored and geometrically necessary dislocations to the mesoscale notion of plastic strain and strain gradient. This theory is motivated by the analysis of indentation experiments which strongly suggest a linear dependence of the square of plastic flow stress on strain gradient. It is believed that a mesoscale theory of plasticity should not only be based on stress-strain behavior obtained from macroscopic mechanical tests, but should also draw information from micromechanical, gradient-dominant tests.

Original languageEnglish (US)
Pages (from-to)1239-1263
Number of pages25
JournalJournal of the Mechanics and Physics of Solids
Issue number6
StatePublished - Apr 14 1999

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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