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SURFACE-ROUGHNESS EFFECTS IN ROLLING CONTACT

THE THEORY OF ROLLING CONTACT THAT IS PRESENTED DEVIATES FROM PAST THEORIES IN TWO RESPECTS: THE CONTACTING SURFACES ARE NOT ASSUMED TO BE TOPOGRAPHICALLY SMOOTH AND COULOMB'S LAW OF FRICTION IS REPLACED BY A LAW DESCRIBING THE BEHAVIOR OF INTERFACIAL FRICTION JUNCTIONS. NUMERICAL RESULTS FOR THE SLIP AS A FUNCTION OF THE NORMAL AND TANGENTIAL LOADS ARE SHOWN TO DEPEND ON A ROUGHNESS PARAMETER D, WHICH, IN TURN DEPENDS ON SURFACE TOPOGRAPHY, THE GROSS GEOMETRY OF THE CONTACTING BODIES AND ON THE NORMAL LOAD. IT IS FOUND THAT WHEN D IS LARGE (I.E., THE SURFACES ARE VERY ROUGH, OR THE NORMAL LOAD IS SMALL), THE SLIP-FORCE RELATIONSHIP DIFFERS CONSIDERABLY FROM THAT PREDICTED BY THE SMOOTH-SURFACE (OR CLASSICAL) THEORY. WHEN D TENDS TO ZERO, THE TWO THEORIES COINCIDE. THE DEPENDENCE OF D ON TOPOGRAPHICAL PARAMETERS IS SHOWN EXPLICITLY. NUMERICAL EXAMPLES INDICATE THAT FOR CYLINDERS OF SMALL RADIUS, SURFACE-ROUGHNESS EFFECTS MAY BE IMPORTANT. THEIR IMPORTANCE DECREASES AS THE CYLINDER RADIUS OR THE MAXIMUM CONTACT PRESSURE IS INCREASED, OR THE SURFACE IS MADE SMOOTHER. THE ROUGH-SURFACE THEORY PRESENTED HERE IS DIRECTLY APPLICABLE ONLY TO TWO-DIMENSIONAL ROLLING CONTACT PROBLEMS. THE MAJOR ADVANTAGE OF THE THEORY IS THAT IT USES A MORE REALISTIC MODEL OF THE INTERFACE THAN DOES THE SMOOTH SURFACE THEORY. THIS MAKES IT EASIER TO INCORPORATE EFFECTS SUCH AS THOSE OF SURFACE CHEMISTRY, BOUNDARY LUBRICATION, AND SURFACE VIBRATION INTO THE THEORY. /ASME/

  • Supplemental Notes:
    • SER. E
  • Authors:
    • Nayak, P R
  • Publication Date: 1972-6

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Filing Info

  • Accession Number: 00207465
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 31 1972 12:00AM