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Title: Mechanical interactions of rough surfaces. Quarterly progress report, July 1-September 30, 1986

Abstract

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)

Authors:
Publication Date:
Research Org.:
SKF Industries, Inc., King of Prussia, PA (USA). SFK Tribonetics
OSTI Identifier:
5349858
Report Number(s):
DOE/ER/13163-12
ON: DE86015908
DOE Contract Number:
AC02-84ER13163
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON NITRIDES; ROUGHNESS; TRIBOLOGY; RESEARCH PROGRAMS; FRACTURES; SURFACES; FAILURES; NITRIDES; NITROGEN COMPOUNDS; PNICTIDES; SILICON COMPOUNDS; SURFACE PROPERTIES; 360203* - Ceramics, Cermets, & Refractories- Mechanical Properties

Citation Formats

McCool, J.I. Mechanical interactions of rough surfaces. Quarterly progress report, July 1-September 30, 1986. United States: N. p., 1986. Web.
McCool, J.I. Mechanical interactions of rough surfaces. Quarterly progress report, July 1-September 30, 1986. United States.
McCool, J.I. 1986. "Mechanical interactions of rough surfaces. Quarterly progress report, July 1-September 30, 1986". United States. doi:.
@article{osti_5349858,
title = {Mechanical interactions of rough surfaces. Quarterly progress report, July 1-September 30, 1986},
author = {McCool, J.I.},
abstractNote = {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)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1986,
month = 9
}

Technical Report:
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  • 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.
  • Simulation studies have been performed to yield the complete distribution of asperity contact area, load and pressure as a function of the separation of rough surfaces. Microcontact models ordinarily yield just the average value of these quantities with no measure of the scatter about the average. The low sliding speed microcontact flash temperature distribution is shown to be computable as a by product of the determination of the microcontact area distribution. A coulomb friction model for traction in the mixed film regime is tested against published data. The required coulomb friction coefficient is found to be unreasonably large. A suggestedmore » explanation is that only contacts larger than some critical minimum can cause loss of electrical insulation between sliding disks. Preliminary ceramic microfracture experiments have resulted in plastic deformation rather than fracture at asperity tips.« less
  • An approach is described for estimating the shape of a roughness profile spectrum based on two parameters normally output by a stylus profile device. The validity of the approach is assessed for twelve distinct surfaces. An experimental approach to studying microfracture in ceramics is described.
  • Static and rolling contact experiments were conducted with silicon nitride (NC-132) in an effort to determine the character of surface asperity response (plastic flow and/or fracture) to combined normal and tangential stress. Preliminary observations show evidence of fracture along the shoulders of grinding ridges. Also, a significant amount of plastic flow can be accommodated without fracture under the localized compressively stressed areas within the contact.
  • 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.