Evaluation of Two Polyimides and of an Improved Liner Retention Design for Self-Lubricating Bushings,

Abstract

Two different polyimide polymers were studied; in addition, the effectiveness of a design feature to improve retention of the self-lubricating composite liners under high load was evaluated. The basic bearing design consisted of a molded layer of chopped graphite-fiber-reinforced-polyimide (GFRPI) composite bonded to the bore of a steel bushing. The friction, wear, and the load carrying ability of the bushings were determined in oscillating tests at 25C, 260C, and 315C at radial unit loads up to 260 MPa. Friction coefficients were typically 0.15 to 0.25. Bushings with liners containing a new partially fluorinated polymer were functional, but had a lower load capacity and higher wear rates than those containing a more conventional, high temperature polyimide. The liner retention design feature reduced the tendency of the liners to crack and work out of the contact zone under high oscillating loads.

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Document Details

Document Type
Technical Report
Publication Date
Oct 24, 1984
Accession Number
ADA305068

Entities

People

  • Harold E. Sliney

Organizations

  • Glenn Research Center

Tags

DTIC Thesaurus Topics

  • Bearings
  • Composite Materials
  • Cracks
  • Crystal Structure
  • Dynamic Loads
  • Failure Mode And Effect Analysis
  • Fibers
  • Friction
  • Gages
  • Graphitic Materials
  • Lubrication
  • Materials
  • Mechanical Engineering
  • Polymer Matrix Composites
  • Reinforced Plastics
  • Steady State
  • Test Equipment

Fields of Study

  • Materials science

Readers

  • Reinforced Composite Materials
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).