Mitigation of Active Corrosion Fatigue and Corrosion Pit Initiated in AA7075-T6 with Low Plasticity Burnishing

Abstract

Corrosion related fatigue failures of aluminum structural alloys adversely impact the structural integrity of aging aircraft. A chemically active environment, susceptible material and alternating tensile stresses are all required for failure. Conventional mitigation strategies isolate the corrosive environment with coatings, change the alloy or heat treatment, or reduce the applied stress by redesign, all expensive solutions. This paper describes an alternate approach, employing surface enhancement by low plasticity burnishing (LPB) to introduce a deep, stable layer of compressive residual stress to eliminate the tensile stresses necessary for failure without altering environment, material or design.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2003
Accession Number
ADA444572

Entities

People

  • John T. Cammett
  • N. Jayaraman
  • Paul S. Prevey

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircrafts
  • Aluminum Alloys
  • Cold Working
  • Corrosion
  • Fatigue Life
  • Machine Tools
  • Machining
  • Materials
  • Materials Science
  • Mechanical Working
  • Plastic Properties
  • Residual Stress
  • Residuals
  • Surface Properties
  • Tools
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

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