Initial Development of a Fatigue-Crack-Retardation Model.

Abstract

A fatigue-crack-propagation model is developed by reducing crack-tip plasticity to a single pair of enlarged dislocations, termed superdislocations, whose response is equivalent to that of the aggregate plastic zone. The crack-tip damage or deformation and accompanying incremental crack advance resulting from each loading cycle are accumulated in a single super-superdislocation pair for residual interaction on the next loading cycle. Key features of this development are that the required material parameters are limited to the shear modulus, Poisson's ratio, and tensile-yield strength, and that crack-surface closure is accommodated. A significant simulation of the fatigue-crack-propagation process along with a promising correlation with experimental results are achieved. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 31, 1976
Accession Number
ADA031071

Entities

People

  • C. Atkinson
  • C. E. Feddersen
  • M. F. Kanninen

Organizations

  • Battelle Memorial Institute

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Aluminum Alloys
  • Chemistry
  • Complex Variables
  • Computational Science
  • Crack Propagation
  • Crack Tips
  • Elastic Properties
  • Engineering
  • Materials
  • Mechanical Properties
  • Mechanics
  • Plastic Properties
  • Shear Modulus
  • Stress Intensity Factors
  • Titanium Alloys
  • Yield Strength

Readers

  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design