RESEARCH ON THE MECHANISMS OF FATIGUE.

Abstract

The accumulation of fatigue damage was studied on a microscopic scale in polycrystalline aluminum cycled at constant strain. At moderate strain amplitudes, the dominant feature is a subgrain structure which originates with the clustering of dislocations into sub-boundaries during the first few hundred cycles of strain. At low strains, large concentrations of dislocation loops are formed, either near subgrain boundaries, or on glide planes in areas devoid of subgrains. These observations were used to construct a model of fatigue hardening which agrees with the published hardening curves for aluminum. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1963
Accession Number
AD0432504

Entities

People

  • J. C. Grosskreutz

Organizations

  • MRIGlobal

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum
  • Amplitude
  • Boundaries
  • Clustering
  • Dislocations
  • Hardening
  • Observation
  • Phase
  • Polycrystals
  • Solid Phases

Readers

  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.