HIGH VELOCITY DISLOCATIONS

Abstract

The elastic displacement field of moving edge dislocations in anisotropic body-centered-cubic and face-centered-cubic crystals is found. From the elastic displacements the shear stress on the dislocation slip plane is determined. The anomalous velocity range in which edge dislocations of like sign attract one another has been calculated for a number of metals and ionic crystals. It is found that anisotropy does not appreciably expand the anomalous range. The problem of dislocation moving on the interface separating media of different elastic properties has been considered. The anomalous velocity range may or may not exist, depending on the values of the elastic constants in the two media. The dislocation self-energy is infact the slowest sound velocity. Supersonic dislocation behavior is qualitatively described.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1962
Accession Number
AD0405146

Entities

People

  • A. Van
  • J. Cotner
  • J. Weertman

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Coordinate Systems
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Cubic Lattices
  • Elastic Properties
  • Energy
  • Equations
  • Government Procurement
  • Governments
  • Materials
  • Materials Science
  • Military Research
  • Rayleigh Waves
  • Secondary Waves
  • Shear Stresses

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science and Engineering.

Technology Areas

  • Hypersonics