THE INFLUENCE OF ROAD SURFACE, SPEED AND TIRE-TREAD DEPTH ON THE ADHESION UNDER WET CONDITIONS

TESTS WERE CARRIED OUT WITH BOTH RADIAL AND CROSS-PLY TYRES TO DETERMINE THE EFFECT OF DEPTH OF TREAD ON WET ROAD ADHESION. THE TREAD DEPTHS ON EACH TYPE OF TYRE VARIED FROM 0 - 8.0 MM. THE COEFFICIENT OF ADHESION WAS OBTAINED BY DIVIDING THE MAXIMUM CORNERING FORCE (TYRE SIDE FORCE) BY THE WHEEL LOAD. THE FOLLOWING ROAD SURFACES WERE USED IN THE TESTS: (1) HEAVILY WORN CEMENT-CONCRETE; (2) NEW CEMENT- CONCRETE; (3) NEW ASPHALT, AND (4) VERY COARSE ASPHALT, AND THE WATER DEPTH ON EACH OF THESE SURFACES WAS 1.5 MM. RESULTS OBTAINED SHOWED THAT: (1) ON ALL SURFACES THE ADHESION COEFFICIENT DECREASES WITH DECREASING TREAD DEPTH; (2) RADIAL TYRES HAD HIGHER ADHESION COEFFICIENTS THAN CROSS-PLY TYRES; (3) BOTH TYPES OF TYRE SHOWED A PROGRESSIVE DECREASE IN ADHESION AS SPEEDS INCREASED AND (4) AT SPEEDS OF 80KM/H THE EFFECT OF ROAD SURFACE ON THE ADHESION OF TYRES UNDER WET CONDITIONS REACHES THE SAME VALUE AS THAT OF TREAD DEPTH.

  • Corporate Authors:

    Motor Industry Research Association

    Watling Street
    Nuneaton CV10 0TU, Warwickshire,   England 
  • Authors:
    • Gengenbach, W
    • WEBER, R
  • Publication Date: 1971

Media Info

  • Features: Figures; References;
  • Pagination: 15 p.
  • Serial:
    • Issue Number: 34

Subject/Index Terms

Filing Info

  • Accession Number: 00207662
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Sep 25 1972 12:00AM