Effects of Geometric Variables on Rub Characteristics of Ti-6Al-4V.

Abstract

Experiments simulating rub interactions between Ti-6Al-4V blade tips and various seal materials were conducted. The number of blade tips and the blade tip geometry were varied to determine their effects on rub forces and on wear phenomena. Contact was found to be quite unsteady for all blade tip geometries except for thos incorporating deliberately rounded blade tips. The unsteady contact was characterized by long periods of rubbing contact and increasing blade tip load that terminated in sudden rapid metal removal, sometimes accompanied by tearing and disruption of porous seal material under the rub surface. A model describing the blade tip loading is proposed and is based on the propagation of an elastic stress wave through the seal material as the seal material is dynamically compressed by the blade tip leading edge. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1981
Accession Number
ADA097600

Entities

People

  • Donald W. Wisander
  • Jan Wolak
  • Robert C. Bill

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Blade Tips
  • Curvature
  • Dynamic Response
  • Equations
  • Geometry
  • Graphitic Materials
  • Leading Edges
  • Load Cells
  • Materials
  • Metals
  • Resonant Frequency
  • Standards
  • Stress Waves
  • Stresses
  • Titanium
  • Turbines
  • X Rays

Readers

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