Study of the Effects of Metallurgical Factors on the Growth of Fatigue Microcracks.

Abstract

The micromechanics of crack tip yielding are characterized for large and small fatigue cracks in aluminum alloys. Techniques used included selected area electron channeling and stereoimaging strain analysis. The anomalous fast growth of small fatigue cracks correlated with greater crack tip strains and displacements, and lower crack opening loads, for microcracks as compared with large cracks. Microcrack growth rate perturbations were modeled in terms of grain boundary induced reductions in crack tip strain. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1984
Accession Number
ADA137954

Entities

People

  • J. Lankford

Organizations

  • Southwest Research Institute

Tags

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Chemistry
  • Crack Tips
  • Cracks
  • Cyclic Loads
  • Displacement
  • Engineering
  • Fatigue Life
  • Grain Boundaries
  • Intensity
  • Materials
  • Materials Science
  • Microstructure
  • Military Research
  • Scientists

Readers

  • Materials Science (Mechanical Engineering).

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene