TYRE PERFORMANCE IN WET SURFACE CONDITIONS

RESULTS OF AN INVESTIGATION ON TIRE/ROAD ADHESION OF A SINGLE WHEEL TOWED THROUGH VARIOUS DEPTHS OF WATER SHOW THAT AT WATER DEPTHS ABOVE 4 MM, A FREELY ROLLING WHEEL TENDS TO SPIN DOWN, THE SPEED OF INCIDENCE DECREASING AS TIRE PRESSURE WAS REDUCED OR THE WHEEL WAS LOCKED. THE GREATEST LOSS IN ADHESION OCCURRED IN THE TRANSITION FROM A DRY ROAD SURFACE TO ONE LIGHTLY WETTED, WITH INCREASING REDUCTION IN ADHESION AS THE WATER DEPTHS WAS INCREASED TO 4 MM; AT DEPTHS GREATER THAN THIS THE ADHESION VALUES WERE CLOSE TO THE MINIMUM. ADHESION ALSO DECREASED WITH AN INCREASE IN SPEED; E.G., A DROP OF 0.3 IN BRAKING FORCE COEFFICIENT OCCURRED WITH A PATTERNED TIRE ON A SMOOTH CONCRETE SURFACE WHEN SPEED WAS INCREASED FROM 50 KM/HR TO 120 KM-HR FOR A 4- MM WATER DEPTH. STOPPING DISTANCES FOR THIS WATER DEPTH CAN BE AT LEAST DOUBLE THOSE FOR A BARELY WET SURFACE. FURTHER TESTS SHOWED THAT ADHESION ON A ROUGH, HARSH-TEXTURED SURFACE IS ALSO AFFECTED BY WATER DEPTH /AUTHOR/

  • Supplemental Notes:
    • Rrl Rept Lr 355, 44 PP, FIGS
  • Authors:
    • Staughton, G C
    • WILLIAMS, T
  • Publication Date: 1970

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00221322
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Jul 2 1971 12:00AM