The Influence of Surface Enhancement by Low Plasticity Burnishing on the Corrosion Fatigue Performance of AA7075-T6

Abstract

Corrosion fatigue, stress corrosion cracking and high cycle fatigue initiating from corrosion pits are primary failure mechanisms that reduce the structural integrity of aging aircraft. A chemically active environment, susceptible material and either static or alternating tensile stresses are required for failure. Conventional approaches to mitigate corrosion related failure mechanisms in aircraft usually involve isolation from the corrosive environment via protective coatings, alloy substitution or modifications in design to reduce stresses, all expensive solutions. This paper describes an alternate approach employing surface enhancement by low plasticity burnishing (LPB) to eliminate or reduce the surface tensile stresses necessary for corrosion fatigue failure in AA7075-T6, without alteration of environment, material or component design.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2002
Accession Number
ADA447009

Entities

People

  • John T. Cammett
  • Paul S. Prevey

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Cracks
  • Environment
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Materials
  • Mechanical Working
  • Military Aircraft
  • Residual Stress
  • Stresses
  • Structural Components
  • Surface Properties
  • Tensile Properties
  • Tensile Stress

Readers

  • Structural Health Monitoring of Composite Structures.
  • Surface Coatings Technology.
  • Systems Analysis and Design