BRAKING FORCE/BRAKING SLIP: MEASUREMENTS OVER A RANGE OF CONDITIONS BETWEEN 0 AND 100 PER CENT SLIP

THE RELATIONSHIP BETWEEN BRAKING FORCE COEFFICIENT (BFC) AND BRAKING SLIP FOR VARIOUS TIRES AND WET ROAD SURFACES HAS BEEN INVESTIGATED WITH PARTICULAR REFERENCE TO THE DEVELOPMENT OF NON-LOCKING BRAKING SYSTEMS. VARIABLES INVESTIGATED INCLUDE TREAD PATTERN, TREAD MATERIAL, ROAD SURFACE TEXTURE, SPEED, AND TIRE CONSTRUCTION. RESULTS SHOW THAT THE BFC/BRAKING SLIP CURVE RAPIDLY REACHES A PEAK BETWEEN SEVEN AND 25 PERCENT BRAKING SLIP AND THEN REMAINS FAIRLY CONSTANT OR SLOWLY DECREASING UNTIL AT ABOUT 85 PERCENT BRAKING SLIP THERE IS A SHARP DECREASE AS THE LOCKED WHEEL CONDITION IS APPROACHED. IN BOTH PEAK AND LOCKED WHEEL CONDITIONS, MEASUREMENTS CONFIRMED PREVIOUS FINDINGS RELATING TO EFFECTIVENESS OF TREAD PATTERNS IN RELATION TO SMOOTH TIRES, EFFECTIVENESS OF LOWER RESILIENCE TREAD MATERIALS, AND DIFFERENCES IN TIRE CONSTRUCTION. TESTS WERE ALSO CONDUCTED UNDER CONDITIONS COMBINING BRAKING AND CORNERING. INCREASE IN SLIP ANGLE CAUSES A REDUCTION IN BFC, AND AN INCREASE IN THE BRAKING SLIP AT WHICH THE BFC REACHES ITS PEAK. FOR BRAKING SLIPS UP TO 20 PERCENT, THE BFC AT A SLIP ANGLE OF 350 MRAD (20) DEGREES IS LESS THAN HALF ITS VALUE AT ZERO SLIP ANGLE. /AUTHOR/

  • Supplemental Notes:
    • Rrl Rpt Lr 292, 13 PP, 15 FIG
  • Corporate Authors:

    Road Research Laboratory /UK

    ,    
  • Authors:
    • HOLMES, K E
  • Publication Date: 1970

Subject/Index Terms

Filing Info

  • Accession Number: 00223258
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 1970 12:00AM