Dislocation Shielding of a Crack in a Quasi Continuum Approximation

Abstract

Earlier predictions of toughness by Thomson and Weertman are reviewed. The differing predictions of the two authors are shown to be due to different interpretations of the functional dependence of the size of the elastic region on intrinsic surface energy. An analysis of the quasi continuum model in terms of dislocation rearrangements is given, and the nature of the boundary condition on the elastic enclave boundary is discussed.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1981
Accession Number
ADA126521

Entities

People

  • E. R. Fuller Jr.
  • R. M. Thomson

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Coordinate Systems
  • Crack Tips
  • Cracks
  • Differential Equations
  • Discrete Distribution
  • Dislocations
  • Displacement
  • Energy
  • Equations
  • Materials
  • Mathematical Analysis
  • Shear Modulus
  • Stress Intensity Factors
  • Stresses
  • Surface Energy
  • Toughness

Readers

  • Materials Science (Mechanical Engineering).
  • Molecular Photonics/Laser Physics
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.