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/
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Supplemental Notes:
- Rrl Rept Lr 355, 44 PP, FIGS
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Authors:
- Staughton, G C
- Williams, T
- Publication Date: 1970
Media Info
Subject/Index Terms
- TRT Terms: Adhesion; Braking; Moisture content; Pavements; Performance tests; Stopping distances; Tires; Wet weather
- Uncontrolled Terms: Wet conditions; Wet pavements
- Old TRIS Terms: Moist condition
- Subject Areas: Highways; Pavements; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00221322
- Record Type: Publication
- Files: TRIS, ATRI
- Created Date: Jul 2 1971 12:00AM