The J-integral and geometrically necessary dislocations in nonuniform plastic deformation

M. X. Shi, Y. Huang*, H. Gao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

A two-dimensional discrete dislocation simulation method is developed to simulate the configuration of geometrically necessary dislocations in a beam subject to combined tension and bending. We confirm that the density of geometrically necessary dislocations is very small under pure tension, and under bending it is 80% higher than that estimated by the Nye-Ashby relation. Our calculations also show that the statistical average of the J-integral is zero under pure tension and its magnitude increases monotonically with the plastic curvature of deformation in combined tension and bending. This may have interesting implications on the strain gradient plasticity theories aiming to model geometrically necessary dislocations.

Original languageEnglish (US)
Pages (from-to)1739-1762
Number of pages24
JournalInternational journal of plasticity
Volume20
Issue number8-9
DOIs
StatePublished - Aug 2004

Keywords

  • Discrete dislocation model
  • Equilibrium dislocation analysis
  • Geometrically necessary dislocation
  • J-integral

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'The J-integral and geometrically necessary dislocations in nonuniform plastic deformation'. Together they form a unique fingerprint.

Cite this