THE MOTION OF A DISLOCATION, ACTED ON BY A VISCOUS DRAG, THROUGH AN ARRAY OF DISCRETE OBSTACLES.

Abstract

A computer model was used to calculate the shape and average velocity of a dislocation acted on by a viscous drag, and moving through a field of point obstacles. As a special case, the operation of a Frank-Read source was computed also. At sufficiently low velocities (and stress levels) the behavior is governed entirely by the obstacle spacing and strength; conventional tensile probably falls in this regime. At sufficiently high velocities (and stress levels) the behavior is governed entirely by the viscous drag; explosive deformation falls in this regime. In between lies a wide range in which the two effects superimpose, each contributing measurably to the flow stress. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1970
Accession Number
AD0704520

Entities

People

  • H. J. Frost
  • M. F. Ashby

Organizations

  • Harvard University

Tags

DTIC Thesaurus Topics

  • Computers
  • Computing Devices
  • Diseases And Disorders
  • Dislocations
  • Energetic Materials
  • Explosives
  • Materials
  • Motion

Readers

  • Fluid Dynamics.
  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster
  • Space - Orbital Debris