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The influence of surface roughness and the contact pressure distribution on friction in rolling/sliding contacts
Chalmers University of Technology, Production Engineering, Göteborg, Sweden.
KTH, Machine Design, Stockholm Sweden.
Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0001-8058-1252
2007 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 40, no 4, p. 694-698Article in journal (Refereed) Published
Abstract [en]

A numerical contact model is used to study the influence of surface roughness and the pressure distribution on the frictional behaviour in rolling/sliding contacts. Double-crowned roller surfaces are measured and used as input for the contact analysis. The contact pressure distribution is calculated for dry static contacts and the results are compared with friction measurements in a lubricated rolling/sliding contact made with a rough friction test rig. The mean pressure is suggested as a parameter that can be used to predict the influence of surface roughness on the friction coefficient in such contacts. The results show two important properties of the friction coefficient for the friction regime studied in this paper: (1) there is a linear decrease in friction coefficient as a function of the slide-to-roll ratio, and (2) the friction coefficient increases linearly with increasing mean contact pressure up to a maximum limit above which the friction coefficient is constant. The absolute deviation of experimental results from the derived theory is for most cases within 0.005.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2007. Vol. 40, no 4, p. 694-698
Keywords [en]
Friction, Surface roughness, Contact pressure distribution, Rolling/sliding contacts
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hh:diva-1362DOI: 10.1016/j.triboint.2005.11.021ISI: 000243576700020Scopus ID: 2-s2.0-33845203604Local ID: 2082/1741OAI: oai:DiVA.org:hh-1362DiVA, id: diva2:238580
Available from: 2008-04-25 Created: 2008-04-25 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Gear tribology: friction and surface topography
Open this publication in new window or tab >>Gear tribology: friction and surface topography
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The quest for energy efficiency leads to the development of highly efficient power transmissions for vehicles. Gears are some of the most rugged and durable torque transmitters among machine elements. Friction between sliding surfaces at gear teeth is one major source of power loss. To increase efficiency and reduce damage accumulation in gears has always been a background motivation to this thesis. It focuses on the frictional performance of manufactured gear surfaces with emphasis on the effect of surface topography and the orientation of its lay.

To achieve the goal of this work, a test rig was designed and constructed. The rig makes it possible to examine gear tooth friction on double crowned rollers. Five alternative gear-finishing processes are implemented in roller surface preparation. They comprise grinding, shotpeening, phosphating, chemical deburring and DLC coating. Theoretically, a friction model is suggested which helps to explain some of the testing results. Advanced surface metrology techniques and statistical tools are implemented in identifying surface features that influence friction.

The result demonstrates that surface topography is a significant factor affecting the lubricated frictional behaviour. For ground-finishing, the smoother the surfaces are finished, the lower friction coefficient they show. Chemical deburring and DLC coating as well as certain degrees of phosphating provide minimum friction coefficient and improved load carrying capacity, which are competitive to fine-ground finishing. Properly designed lay combinations of meshing gear surfaces can minimise friction and improve gear transmission efficiency. Theoretically, the friction coefficient can be explained by means of a combination of the slide-to-roll ratio and the real mean contact pressure within the range of loads considered in this thesis. Finally, features that correlate surface topography to friction are identified.

Place, publisher, year, edition, pages
Göteborg: Chalmers university of technology, 2005. p. 46
Series
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, ISSN 0346-718X ; 2263
Keywords
Friction, Surface topography, Toughness, Lay, Gears, Power transmission
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-721 (URN)2082/1070 (Local ID)91-7291-581-1 (ISBN)2082/1070 (Archive number)2082/1070 (OAI)
Public defence
2005-04-08, KB Salen, K-huset, Chalmers Tekniska Högskola, Göteborg, 13:00 (English)
Opponent
Supervisors
Available from: 2007-06-11 Created: 2007-06-11 Last updated: 2018-03-23Bibliographically approved

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Rosén, Bengt Göran

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