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An experimental study on the influence of substrate roughness on the friction of a tread block in rolling and sliding contact
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-2683-1553
(English)Manuscript (preprint) (Other academic)
Abstract [en]

An experimental study of the friction coefficient is performed for a tyre tread block in rolling and sliding contact with two different asphalt substrates, a smooth aluminium and an anti-slip tape substrate. The sliding friction coefficient is for all substrates seen to increase as the sliding velocity is increasing. However, the slope for the increasing friction as a function of sliding velocity differs significantly between the substrates, presumably due to differences in the respective contribution from adhesive and hysteresis friction mechanisms. Parametric studies of the rolling friction show that the choice of substrate as well as the rolling velocity and the slip ratio has significant influence on the resulting friction coefficient. A linear relation is observed between the longitudinal rolling friction coefficient measured at low values of slip ratio and the sliding friction coefficient measured at low sliding velocities. For the tests of rolling friction at higher values of slip, stick\textendash slip conditions are observed for which the frequency content of the longitudinal force is seen to vary substantially between the different operating conditions and choice of substrate. The outcomes of this study can potentially be used to improve future tyre\textendash road contacts with respect to wear, traction and noise generation.

Keyword [en]
-
National Category
Vehicle Engineering Tribology Fluid Mechanics and Acoustics
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-193932OAI: oai:DiVA.org:kth-193932DiVA: diva2:1034690
Projects
Centre for Eco2 Vehicle Design
Funder
VINNOVA
Note

QC 20161013

Available from: 2016-10-12 Created: 2016-10-12 Last updated: 2016-10-13Bibliographically approved
In thesis
1. On the influence of surface roughness on rolling contact forces
Open this publication in new window or tab >>On the influence of surface roughness on rolling contact forces
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Road vehicle tyres, railway wheels and ball bearings all generate rolling contact forces which are transferred within a finite area of contact between the rolling element and the substrate. Either it is visible or not for the human eye, a certain degree of roughness is always present on the contacting surfaces and it influences the generation of both vertical and lateral contactforces. The purpose of this investigation is to enhance the understanding and modelling of the influence from small-scale surface roughness on the generation of rolling contact forces. To this end, a computationally efficient method to include roughness-induced contact nonlinearities in the dynamic modelling of rolling contacts is proposed. The method is implemented in a time domain model for vertical wheel–track interaction to model rolling-induced rail vibrations, showing good agreement with measurements. Furthermore, a test rig is developed and used for the investigation of tyre–road rolling contact forces. Detailed studies are performed on the influence of substrate roughness on the resulting contact forces for a tyre tread block which is rolling at different operating conditions. The choice of substrate as well as the rolling velocity and the slip ratio is observed to have significant influence on the resulting friction coefficient. For high slip ratios, stick–slip oscillations appear, exhibiting frequency content which is largely dependent on the choice of substrate. The outcomes of this study can potentially be used to improve future tyre–road contacts with respect to wear, traction and noise generation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 36 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:75
Keyword
Rolling contact, Surface roughness, Contact forces, Contact modelling, Friction, Road, Asphalt, Substrate, Test-rig, Sliding, Stick–slip, Tyre, Rubber, Tread-block, Wheel–rail interaction
National Category
Engineering and Technology Mechanical Engineering Vehicle Engineering Tribology Fluid Mechanics and Acoustics
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-193935 (URN)978-91-7729-145-9 (ISBN)
Public defence
2016-11-07, F3, Lindstedtsvägen 26, Stockholm, 09:30 (English)
Opponent
Supervisors
Projects
Centre for Eco2 Vehicle Design
Funder
VINNOVA
Note

QC 20161013

Available from: 2016-10-13 Created: 2016-10-12 Last updated: 2016-10-13Bibliographically approved

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