A NOTE ON YIELD CURVES IN CYCLIC WORK SOFTENING

Abstract

Cyclic work softening is a transient behavior which occurs at the beginning of fatigue tests and reduces the mechanical strength of the material. Softening is likely to occur in hard materials under low cycle fatigue conditions. A method is described by which cyclic softening or hardening can be predicted from the monotonic properties of the material. The mechanisms which produce softening are not completely understood but appear to vary depending on the mechanisms which produce the hardening of the material. Since cyclic softening is an unstable behavior, it cannot be described by any 'stable material' models. Tests on 1100-H14 aluminum indicate that the material softens under cyclic torsion and that the softening causes only a very small reduction in the tensile strength.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1967
Accession Number
AD0663182

Entities

People

  • W. R. Powell

Organizations

  • Brown University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Cold Working
  • Continuum Mechanics
  • Cyclic Tests
  • Engineering
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Grain Boundaries
  • Hardening
  • Hardness
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Strain Hardening
  • Stress Strain Relations
  • Stresses
  • Tensile Strength
  • Yield Strength

Readers

  • Structural Health Monitoring of Composite Structures.