Slip Continuity in Explicit Crystal Plasticity Simulations Using Nonlocal Continuum and Semi-discrete Approaches

Abstract

Slip continuity across element boundaries in explicit finite element simulations is enforced through nonlocal penalty constraints applied to continuum crystal plasticity relations and in a nonlocal, semi-discrete crystal slip model. The continuity constraints provide additional coupling within the plastic deformation field, and a length scale effect is introduced. The deformation field becomes more diffuse with reduced physical size of the model region and the strength increases. Consideration of the physical spacing of dislocations and the typical size of dislocation cells in deformed metals elicits concerns about the applicability of continuum slip models with sub-micron spatial resolution.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2013
Accession Number
ADA578128

Entities

People

  • Richard Becker

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Cell Structure
  • Cells
  • Continuity
  • Crystal Lattices
  • Crystals
  • Dislocations
  • Grain Boundaries
  • Hardening
  • Plastic Properties
  • Polycrystals
  • Shear Stresses
  • Simulations
  • Single Crystals
  • Strain Hardening
  • Strain Rate
  • Yield Strength

Readers

  • Computational Fluid Dynamics (CFD)
  • Materials Science and Engineering.
  • Structural Dynamics.

Technology Areas

  • Space