Damage Tolerance Improvement of Ti-6-4 Fan Blades With Low Plasticity Burnishing

Abstract

Low plasticity burnishing (LPB) has been demonstrated to increase the damage tolerance of Ti- 6Al-4V fan blades by an order of magnitude. First stage Ti-6Al-4V fan blades were LPB processed using a conventional 4-axis CNC machine tool. LPB dramatically improved surface finish with negligible blade distortion and produced compressive residual stresses of -690 MPa (-100 ksi) through the entire thickness of the blade leading edge. Fatigue testing demonstrated that the deep compression of LPB provided a 3X improvement in HCF endurance limit, complete tolerance of FOD up to 1.3 mm (0.050 in.) deep, and an order of magnitude improvement in fatigue life. Damage tolerance for the TI-6AL-4V fan blade was improved by an order of magnitude.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2002
Accession Number
ADA444604

Entities

People

  • D. J. Hornbach
  • J. T. Cammett
  • P. S> Prevey
  • R. Ravindranath

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Compression
  • Damage Tolerance
  • Fan Blades
  • Fatigue Life
  • Foreign Object Damage
  • Leading Edges
  • Mechanics
  • Military Aircraft
  • Residual Stress
  • Stresses
  • Thickness
  • Titanium
  • Titanium Alloys
  • Tools
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Aerodynamics.
  • Mechanical Engineering/Mechanics of Materials.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).