FURTHER COEFFICIENT OF FRICTION TESTS

A METHOD IS SUBMITTED FOR CALCULATING THE THEORETICAL STOPPING DISTANCES OF AUTOMOBILES BY AVERAGING THE COEFFICIENTS OF FRICTION ON THE BASIS OF THE SQUARE OF THE SPEED. THE RESULTS POINT OUT THE LOWER COEFFICIENTS GENERALLY FOUND AT THE HIGHER SPEEDS. SUCCESSIVE TESTS ON VERTICAL-FIBER WIRE-CUT LUG BRICK ROADS WITH ASPHALT FILLER HAVE SHOWN A CONTINUED DECREASE IN BOTH THE MAXIMUM ROLLING AND THE SLIDING COEFFICIENTS OF FRICTION DUE TO THE EXTRUSION OF THE ASPHALT. IN TESTS ON SNOW, NON-SKID TIRES SHOWED AN ADVANTAGE OF 7 TO 27 PERCENT OVER SMOOTH TIRES AT SPEEDS BETWEEN 20 AND 40 MILES PER HOUR. ROLLING COEFFICIENT FOR THE 5.00 INCH NON-SKID TIRE WAS 12 PER CENT BETTER THAN FOR THE 6.50 INCH TIRE WHEN STOPPING FROM 40 MILES PER HOUR BUT SHOWED NO DIFFERENCE WHEN SLIDING. FOR SMOOTH TIRES, THE 5.00 INCH TIRE HAD AN ADVANTAGE OF 8 AND 14 PERCENT OVER THE 6.50 TIRE FOR ROLLING AND SLIDING RESPECTIVELY. /AUTHOR/

  • Supplemental Notes:
    • Vol 14, ParT I, PP 131-147, 18 FIG, 4 TAB
  • Authors:
    • Stinson, K W
    • Roberts, C P
    • Hayden, H P
  • Publication Date: 1935

Media Info

  • Monograph Title: Proceedings of the Fourteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 6-7, 1934. Part I
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207167
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM