This article shows how the American company Veridian Engineering measures some properties of tyres on wet surfaces at its Tire Research Facility (TIRF). The area under the small patch of tyre tread area in contact with the road surface, its 'footprint', has an extremely complex pressure and friction distribution. TIRF test equipment can specify or measure these quantities very accurately. The footprint contact area determines how well a tyre can perform its many functions. Many variables affect it, including vehicle speed, tyre body rigidity, tyre tread design, tyre inflation pressure, road surface composition and roughness, and the nature and depth of any fluid that may be on the road surface. Experiments show quantitatively how slippery roads adversely affect tyre traction. The TIRF tyre test machine has a simulated roadway in the form of a 28in wide continuously moving flat stainless steel belt. It can perform a wide variety of standard and custom field test evaluations for a full range of tyre types and sites. Several roadway surfaces are available, each with different friction properties that can simulate a wide range of actual surfaces. The article outlines a typical tyre performance evaluation at TIRF, testing the relative effects of a wet surface on the lateral force developed by 11R24.5 lorry tyres.

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    UK and International Press

    120 South Street
    Dorking, Surrey RH4 2EU,   England 
  • Authors:
    • Galganski, R A
  • Publication Date: 2000-2


  • English

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Filing Info

  • Accession Number: 00795133
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 7 2000 12:00AM