Wheel Bearing Brake/Instrumented Wheelset (WBB/IWS) Friction Characterization Study

The wheel/rail (W/R) interface experiences variable friction conditions during in-service operation. This is due mainly to the application of top-of-rail friction modifiers, gage face lubricants, and other third-body materials that exist at the W/R interface due to non-controlled environmental factors (e.g., rain, ice, plants, etc.). Friction acts to modify the traction coefficient (Tc) (i.e., creep curve) at the W/R contact zone. Understanding creep curve behavior as a function of friction is critical to providing accurate numerical modelling boundary condition inputs of wheel response during train operation. Accurate numerical modelling of train operations allows optimization of in-service component life cycles, maximizing safe operations of these components and minimizing detrimental environmental impacts. The study was aimed at mapping out Tc behavior as a function of four friction conditions: dry, wet, lube stick, and top of rail friction modification stick, applied directly on the wheel tread surface. In addition, vertical loading and wheel speed were investigated. Creep curve saturation results were presented independently as a function of each input condition. Wear and rolling contact fatigue were assessed as well on the wheel running surface following each friction condition run.

  • Record URL:
  • Record URL:
  • Corporate Authors:

    National Research Council of Canada

    2320 Lester Road, Building U-89
    Ottawa, Ontario  Canada  K1V 1S2

    Federal Railroad Administration

    Office of Railroad Policy and Development, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    Federal Railroad Administration

    Office of Research, Development, and Technology
    Washington, DC  United States 
  • Authors:
    • Szablewski, Daniel
    • Caldwell, Robert
  • Publication Date: 2019-12


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report; Technical Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 39p

Subject/Index Terms

Filing Info

  • Accession Number: 01724793
  • Record Type: Publication
  • Report/Paper Numbers: DOT/FRA/ORD-19/46
  • Contract Numbers: FR-RPD-0054-13-01-00
  • Created Date: Dec 9 2019 5:01PM