Restoring Fatigue Performance of Corrosion Damaged Aa7075-T6 and Fretting in 4340 Steel with Low Plasticity Burnishing

Abstract

Corrosion related fatigue in aluminum structural alloys and fretting damage in high strength steels are primary failure mechanisms that reduce the structural integrity of aging aircraft. A chemically active environment, susceptible material and static and/or alternating tensile stresses are all required for failure. Conventional approaches to mitigate corrosion and fretting related failure mechanisms address either elimination of the corrosive environment with coatings, substitution or modification of alloys, or changes in design, 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 either material or design.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2002
Accession Number
ADA444606

Entities

People

  • John T. Cammett
  • Paul S. Prevey

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

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

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Surface Engineering/Surface Coating Technology.
  • Systems Analysis and Design