THE EFFECT OF ROADSTONE MICROROUGHNESS ON RUBBER FRICTION

THE RELATION BETWEEN MICROROUGHNESS OF A CONTINUOUS SURFACE AND THE FRICTION DEVELOPED BY A RUBBER SPECIMEN SLIDING ON IT AT LOW SPEED (LESS THAN 10 IN./MIN.) WAS INVESTIGATED THEORETICALLY AND EXPERIMENTALLY. FOR THE EXPERIMENTS A RUBBER ANNULUS WAS ROTATED AGAINST GLASS SURFACES WHICH HAD BEEN ROUGHENED WITH CAREFULLY GRADED ABRASIVES. IT WAS FOUND THAT UNDER DRY CONDITIONS THE COEFFICIENT OF FRICTION GRADUALLY DECREASES WITH INCREASED ROUGHNESS (PRODUCED BY ABRASIVES RANGING IN GRAIN SIZE FROM 0.3 TO 190 MICRONS), WHILE IN THE PRESENCE OF WATER THE COEFFICIENT INCREASES FROM A VERY LOW MINIMUM (WHICH WAS FOUND TO BE CONSTANT BETWEEN 0.3 AND 5 MICRONS) TO A MAXIMUM AT AROUND 35 MICRONS AND THEN BECOMES INSENSITIVE TO CHANGES IN ROUGHNESS (190 MICRONS WAS THE UPPER LIMIT INVESTIGATED). THESE FINDINGS WERE COMPARED WITH THE LIMITED DATA IN THE LITERATURE. ONLY PARTIAL AGGREGATE WAS FOUND, BUT WHERE THERE ARE DISPARITIES THESE COULD BE EXPLAINED BY DIFFERENCES IN EXPERIMENTAL PROCEDURE AND SURFACE PREPARATION. QUALITATIVELY, THE EXPERIMENTAL RESULTS COULD BE ADEQUATELY EXPLAINED BY THE MODEL FOR ADHESIVE (OR SURFACE) FRICTION WHICH CONSIDERS THE NUMBER OF MOLECULAR JUNCTIONS AND THE JUNCTION FORCES. THE EXPERIMENTS SHOWED, HOWEVER, HOW STRONGLY THE ADHESION COMPONENT OF FRICTION IS DEPENDENT ON SURFACE CONTAMINATION. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1(5), BPR NO 10, STATE NO 097
  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  United States  16802

    Pennsylvania Department of Highways

    400 North Street
    Harrisburg, PA  United States  17120-0095

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • White, D L
  • Publication Date: 1968-11

Subject/Index Terms

Filing Info

  • Accession Number: 00206361
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: May 19 1994 12:00AM