On Microstructural Control of Near-Threshold Fatigue Crack Growth in 7000-Series Aluminum Alloys.

Abstract

Fatigue crack growth rate data for 7000-series aluminum alloys can be approximated with a multilinear form, when plotted in conventional logarithmic coordinates over a sufficiently broad spectrum of delta K. Each transition point in the growth-rate curve appears to be associated with a specific microstructural feature that can serve as a barrier to slip-band transmission, in accord with the cyclic plastic zone model of fatigue crack growth. Evidence strongly suggests that transition to the threshold for fatigue crack growth is controlled by dispersoid particles. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 02, 1982
Accession Number
ADA113486

Entities

People

  • George R. Yoder
  • L. A. Cooley
  • Thomas W. Crooker

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Boundaries
  • Crack Propagation
  • Cracks
  • Grain Size
  • High Humidity
  • Intensity
  • Mean Free Path
  • Microstructure
  • Military Research
  • Particles
  • Steel
  • Titanium Alloys
  • Transitions
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Calculus or Mathematical Analysis
  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.