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Title: Mechanical interactions of rough surfaces. Progress report, July 1, 1984-September 30, 1984

Abstract

This report is a Quarterly Report of Progress. The status of optical rig tests performed under fully flooded and starved conditions is summarized. Procedures for relating fringegram color and film thickness are described. A scheme is described for estimating the spectral moment by a modern profile measurement device. A computer program implementing the scheme and performing a microcontact analysis is discussed and sample output is given.

Authors:
Publication Date:
Research Org.:
SKF Industries, Inc., King of Prussia, PA (USA)
OSTI Identifier:
6417357
Report Number(s):
DOE/ER/13163-4
ON: DE85000814
DOE Contract Number:
AC02-84ER13163
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ROUGHNESS; COLOR; COMPUTERIZED SIMULATION; FILMS; MATHEMATICAL MODELS; MECHANICAL PROPERTIES; MECHANICS; SURFACE PROPERTIES; SURFACES; OPTICAL PROPERTIES; ORGANOLEPTIC PROPERTIES; PHYSICAL PROPERTIES; SIMULATION; 420500* - Engineering- Materials Testing

Citation Formats

McCool, J.I. Mechanical interactions of rough surfaces. Progress report, July 1, 1984-September 30, 1984. United States: N. p., 1984. Web.
McCool, J.I. Mechanical interactions of rough surfaces. Progress report, July 1, 1984-September 30, 1984. United States.
McCool, J.I. 1984. "Mechanical interactions of rough surfaces. Progress report, July 1, 1984-September 30, 1984". United States. doi:.
@article{osti_6417357,
title = {Mechanical interactions of rough surfaces. Progress report, July 1, 1984-September 30, 1984},
author = {McCool, J.I.},
abstractNote = {This report is a Quarterly Report of Progress. The status of optical rig tests performed under fully flooded and starved conditions is summarized. Procedures for relating fringegram color and film thickness are described. A scheme is described for estimating the spectral moment by a modern profile measurement device. A computer program implementing the scheme and performing a microcontact analysis is discussed and sample output is given.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1984,
month = 9
}

Technical Report:
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  • Objectives are to study lubricated contacts of rough surfaces under combined rolling, sliding, and spinning, and to develop techniques for analyzing digitized rough surface profiles. A summary is presented of annual progress and of the papers presented at conferences and those published. An example is given of the use of the computer tool MICROCOND. Rq (surface roughness), q, and microfracture data are discussed for silicon nitride coupons. (DLC)
  • Mechanical interaction studies and signal processing for surface roughness parameters are reported. Rig modifications that have been implemented are reviewed along with the status of load fluctuation improvement efforts. The status of initial traction/film thickness tests which were conducted with both ball and roller test elements is reviewed. An expository paper comparing models for the contact of rough surfaces is included.
  • Rig modifications currently underway are briefly reviewed. An evaluation of the computerized roughness processing system performed using a precision sinusoidal specimen is described in some detail. An expository paper on the elastic contact of rough surfaces has been drafted and is briefly described herein. The text of a reply to a discussion of a recently presented paper is given.
  • Full film traction test results obtained at various loads and speeds with two oils, two test elements (a ball and roller) and with and without lateral sliding, are presented and discussed. Lubricant properties deduced from the tests performed without lateral sliding were used with the Tevaarwerk-Johnson fluid traction model incorporated within program TRIBOS, to predict the corresponding traction coefficient and traction curve slope in the presence of lateral sliding. Tests designed to infer the asperity Coulomb friction coefficient in the partial film or mixed EHD region are described. Surface roughness parameters obtained by digital processing of the multiple traces mademore » on these disks used in the mixed traction tests are summarized. The criteria that these parameters must satisfy for internal consistency and hence for proper functioning within a microcontact model are derived. Modifications to computer program SKARESIM are described. Methodology for estimating the value of the mean square profile curvature m/sub 4/ using the output of a conventional stylus profile instrument is evaluated. Predicted and directly measured values of m/sub 4/ are compared and shown to be consistent within sampling error. A procedure is described for assessing via SKARESIM, a criterion which alleges that stylus profile fidelity is acceptable when m/sub 4/ does not exceed the inverse of the square of the profile radius.« less
  • A presentation was prepared and delivered at the ASME/ASLE Joint Tribology Conference in October. The presentation emphasized the applicability of a proposed approach for interpreting roughness data with respect to the stress conditions prevailing at microcontacts. Highlights are given of a paper drafted during this reporting period, in which an elastic-plastic traction model is evaluated with respect to two sets of data which reflect the effects of lateral sliding and spin on traction curve slope and the effect of spin velocity on spinning torque.