THE MECHANICS OF REPEATED DISCONTINUOUS YIELDING OF METALS,

Abstract

An explanation is proposed for the occurrence of repeated discontinuous yielding of metals. The discussion is based primarily on observations for slightly impure aluminum, but is sufficiently general to apply to most metals. The responsible material property is considered to be time dependent strengthening that takes place during yielding. The details of the discontinuities, i.e. whether steps or serrations appear on the stress-strain relation, are shown to depend on the mechanics of the test procedure. The dislocation processes involved in repeated discontinuous yielding are described in terms of the equations of dislocation dynamics. The hypothesis of successive breakaway of dislocations from pinning points appears to be unnecessary in explaining this effect. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1967
Accession Number
AD0652240

Entities

People

  • S. R. Bodner

Organizations

  • Technion – Israel Institute of Technology

Tags

DTIC Thesaurus Topics

  • Aluminum
  • Discontinuities
  • Dislocations
  • Dynamics
  • Equations
  • Materials
  • Mechanical Properties
  • Mechanics
  • Metals
  • Observation
  • Physical Properties
  • Physics
  • Stress Strain Relations
  • Stresses

Readers

  • Materials Science and Engineering.
  • Theoretical Analysis.