CONTRIBUTION OF THE RUBBER COMPOUND TO THE WET SKID RESISTANCE OF TIRES

RESEARCH CONDUCTED TO UNDERSTAND THE EFFECT OF RUBBER COMPOSITIONS ON SKID RESISTANCE IS DESCRIBED. THE MAJOR INTERACTIONS WHICH OCCUR BETWEEN ROAD SURFACES AND RUBBER COMPOUNDS AND THE PROPERTIES OF THE COMPOUNDS WHICH OFFER A MAJOR CONTRIBUTION TO THE COEFFICIENT OF FRICTION ARE DISCUSSED. EMPHASIS IS PLACED ON THE PRACTICAL ASPECTS OF SKID RESISTANCE WHICH ARE THE CONCERN OF EVERY DRIVER, RATHER THAN EXTREME CONDITIONS INFREQUENTLY ENCOUNTERED IN NORMAL DRIVING. THE PORTABLE SKID TESTER DEVELOPED BY THE BRITISH ROAD RESEARCH LABORATORY IS USED FOR TESTING AND A VERY GOOD CORRELATION WAS FOUND BETWEEN LOCKED-WHEEL SLIDING OF VEHICLES ON ACTUAL SLIPPERY ROADS AND LABORATORY TESTS WITH THE PORTABLE TESTER ON APPROPRIATELY CHOSEN SURFACES. THE CONTRIBUTION OF THE ROAD SURFACE TO THE WET FRICTION COEFFICIENT MAY BE CONSIDERED TO CONSIST OF TWO PARTS: A DEFORMATION COMPONENT AND AN ABRASIVE COMPONENT. THESE TWO COMPONENTS OF A SURFACE APPEAR TO BE SHARPLY DISTINGUISHABLE EXPERIMENTALLY BY EVALUATING THE FRICTION OF RUBBER MATERIALS OF LOW AND HIGH HYSTERESIS. THE DEFORMATION COMPONENT CONTRIBUTES MORE TO FRICTION IN A HIGH-HYSTERESIS RUBBER AND VERY SLIGHTLY TO FRICTION IN A LOW-HYSTERESIS RUBBER. TWO PROPERTIES, HYSTERESIS (AS MEASURED BY REBOUND RESILIENCE) AND MODULUS (SHORE A HARDNESS), DETERMINE THE RELATIVE FRICTION OF A RUBBER COMPOSITION ON A TYPICAL SLIPPERY ROAD WITHIN THE EXPERIMENTAL ERROR. THE SECOND- ORDER TRANSITION TEMPERATURE SETS PRACTICAL LIMITS ON FRICTION COEFFICIENTS THAT CAN BE OBTAINED FOR A GIVEN RUBBER. HOWEVER, MAJOR COMPOUNDING INGREDIENTS (OIL AND BLACK) CHANGE THE HYSTERESIS AND MODULUS OF TIRE RUBBERS IN DIFFERENT WAYS, SO THE COMPOUND MUST BE CONSIDERED AS A WHOLE.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1968/214/214-001.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Surface-Vehicle Interaction, and presented at the 46th and 47th Annual Meeting of the Highway Research Board. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Carr, C I
• Publication Date: 1968

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 1-6
• Monograph Title: Surface properties of pavements and vehicle interaction
• Serial:
  • Highway Research Record
  • Issue Number: 214
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Abrasions; Bitumen; Canal lock operations; Coefficient of friction; Deformation; Hardness; Hysteresis; Laboratory tests; Materials selection; Measuring instruments; Moisture content; Oils; Pavements; Portable equipment; Rubber; Skid resistance; Skid resistance tests; Surface course (Pavements); Temperature gradients; Texture; Tires; Wheels
• Uncontrolled Terms: Sliding; Wet conditions
• Subject Areas: Highways; Pavements; Vehicles and Equipment;

Filing Info

• Accession Number: 00206742
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jul 15 1994 12:00AM