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Friction in Wheel - Rail Contacts

File Language:
English


Details

  • Creators:
    Popovici, Radu
  • Corporate Creators:
    University of Twente / Wohrmann Printing Service
  • Subject/TRT Terms:
  • DOI:
  • Resource Type:
    Thesis
  • Right Statement:
    Open Access
  • Geographical Coverage:
    Netherlands
  • Corporate Publisher:
    University of Twente / Wohrmann Printing Service
  • Abstract:
    This dissertation investigates the fundamental mechanisms governing friction in wheel–rail contacts, particularly under low-adhesion conditions often experienced during autumn due to environmental contaminants. The research, supported by the Dutch rail operator (NS) and infrastructure manager (ProRail), integrates both theoretical modeling and experimental validation to address the persistent problem of slippery tracks.

    A mixed lubrication model based on elliptical Hertzian contact geometry is developed, incorporating the Eyring shear stress theory to describe the interfacial layer acting as a lubricant. The model accounts for key phenomena such as frictional heating, starvation, viscoelastic behavior, and rolling with lateral slip. It produces Stribeck and traction curves that describe how friction varies with velocity, slip, and other dynamic variables.

    Validation is achieved through a dual experimental approach. Laboratory tests replicate elliptical contact conditions using lubricants, while field tests involve two custom-built tribometers—one fixed on a sliding rail-contact probe and another mounted on a moving train, capable of collecting traction data at speeds up to 100 km/h. Over 6000 friction measurements collected during a 20-night campaign reveal strong correlation with the proposed model. Findings confirm that low-friction scenarios are best explained by viscoelastic rheology of the interfacial layer. The study provides actionable recommendations for train operators and infrastructure managers to predict and mitigate slippery rail conditions, enhancing operational safety and efficiency.

  • Content Notes:
    This is an open access work. Please cite as: Popovici RI. Friction in wheel - rail contacts. Enschede/ Zutphen: University of Twente / Wohrmann Printing Service, 2010. 182 p. doi: 10.3990/1.9789036529570
  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:3a64602721eac6095a4302f53e3f3f6a7328bf339b88143dcd9afd80c196cd0d565cf2f666127486e643a62dd9067a8ce1f1ff145d4345ace6c34718cbd55894
  • Download URL:
  • File Type:
    Filetype[PDF - 2.88 MB ]
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