Dislocation Transport in Continuum Crystal Plasticity Simulations (First-year Report)

Abstract

Continuity of dislocation flux across element boundaries is introduced into a non-local, explicit finite element code using a continuum crystal plasticity constitutive model. In addition to providing enhanced coupling of the deformation field among neighboring elements, dislocation fluxes are integrated through time to give an estimate of dislocation gradients that serve as a strengthening mechanism. The results demonstrate the effects of dislocation flux continuity and the realization of a size scale associated with the gradient hardening. Numerical issues relating to spatial oscillations are identified for future work.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2011
Accession Number
ADA554973

Entities

People

  • Richard Becker

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Continuity
  • Crystal Lattices
  • Crystals
  • Grain Boundaries
  • Hardening
  • Materials
  • Mechanical Properties
  • Mechanics
  • Plastic Properties
  • Simulations
  • Single Crystals
  • Strain Hardening
  • Stress Strain Relations
  • Thick Films
  • Transport Ships
  • Two Dimensional

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Materials Science and Engineering.