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Friction of a rubber tread block in rolling and sliding contact with asphalt---An experimental study
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]

The longitudinal and vertical contact force history of an individual truck tyre tread block in rolling contact with an asphalt surface is experimentally investigated. Different rolling velocities up to approximately 60 km/h and different amount of slip ratios are studied with the use of a novel compact internal drum test rig, leading to results with high signal-to-noise ratio. Interestingly, the longitudinal rolling contact force component and the corresponding friction coefficient exhibit substantial variations not only between the different operating conditions, but also along the contact length of individual impacts. In addition, separate investigatory characterisations for the dynamic elastic deformation of the rubber and for the sliding friction of the rubber\textendash asphalt contact are found to be useful; they provide approximate input values for an initial, promising attempt to separate the contribution from elastic deformation and that from sliding friction. Conclusively, valuable insights are gained which has the potential to further reduce the gap between physically based modelling of friction and empirically based knowledge, which are commonly used in vehicle and tyre industry.

Keyword [en]
Friction; Asphalt; Rolling; Sliding; Stick-slip; Tyre--road; Contact forces; Tread block; Test rig
National Category
Vehicle Engineering Tribology Fluid Mechanics and Acoustics
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-193931OAI: oai:DiVA.org:kth-193931DiVA: diva2:1034689
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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