Crack Tip Plasticity Associated with Corrosion Assisted Fatigue.

Abstract

Measurement of the influence of water vapor in the environment on fatigue crack tip strains and stresses has been the objective of this program. In low-carbon steel, stresses in the plastic zone were deduced by imaging subcells formed during fatigue crack growth. Water vapor was found to lower the stress levels and decrease the size of the zone of stresses exceeding the yield value. Strains within the plastic zone and at the crack tip may be determined by the stereoimaging technique. For low-carbon steel, water vapor lowers the strains carried by the crack tip, and stresses computed from these strains agree well with those determined from measurement of subcell size. A manuscript is included in this report which describes the computational technique of converting strains to stresses.

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Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1982
Accession Number
ADA123391

Entities

People

  • D. L. Davidson
  • J. Lankford

Organizations

  • Southwest Research Institute

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Corrosion
  • Crack Propagation
  • Electron Microscopy
  • Elements
  • High Resolution
  • Materials
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Metallurgy
  • Plastic Properties
  • Powder Metallurgy
  • Scanning Electron Microscopy
  • Stress Strain Relations
  • Stresses

Readers

  • Materials Science (Mechanical Engineering).