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BEAUTRU, Yannick; KANE, Malal; DO, Minh Tan; CEREZO, Véronique (2012)
Publisher: HAL CCSD
Languages: French
Types: Conference object
Subjects: FILM D'EAU, [ SPI.MECA.MSMECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], ADHESIVITE, FROTTEMENT, MICROTEXTURE, [ PHYS.MECA.MSMECA ] Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], ADHERENCE (PNEU ROUTE)
This paper deals with the contribution of road surface microtexture to the relationship between tire/road friction and water depth. The main objectives are the estimation of local water depths trapped at the tire/road interface and the definition of a critical water depth which can be used for driver assistance and information systems. Tests are performed in laboratory. Specimens are slabs made of asphalt concrete and mosaics composed of coarse aggregates. The aggregate mosaics are sandblasted to simulate different microtexture levels. Friction is measured by the Dynamic Friction Tester (DFT) machine at various speeds ranging between 20km/h and 80km/h. Microtexture profiles are measured by laser sensors. It was found that the friction-water depth curves have an inverse-S shape and present an initial constantfriction part before decreasing to a minimum value. The critical water depth, defined as the water depth above which the friction coefficient collapses significantly, is determined from observed friction-water depth curves. Thickness of the water film trapped between the surface aggregate summits and device measuring pad/tire tread is estimated from contact models using surface texture profiles. The order of magnitude corroborates values found in the literature. Relationship between the local water depth, taking into account the tire/road contact conditions, and the global one, as measured by most sensors, is presented. Influence of surface microtexture is discussed in terms of exerted pressure to break through the water film.
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    • ASTM E1911 2009. Standard Test Method for Measuring Paved Surface Frictional Properties Using the Dynamic Friction Tester. ASTM.
    • Do, M.T. 2004. Contribution of road-texture scales to pavement skid-resistance (in French, summary in English). Report n° LPC-ER-CR 04-35. Paris: LCPC.
    • Ford, I.J. 1993. Roughness Effect on Friction for Multi-Asperity Contact Between Surfaces. Journal of Physics D: Applied Physics 26: 2219-2225.
    • Kulakowski, B.T. & Harwood DW. 1990. Effect of Water-Film Thickness on Tire-Pavement Friction. In W.E. Meyer & J.Reichter (eds), Surface Characteristics of Roadways: International Research and Technologies, ASTM STP 1031: 50-60. Philadelphia: ASTM.
    • Kummer, H.W., Meyer, W.E. 1966. New Theory Permits Better Frictional Coupling between Tire and Road. Proceedings of the 11th International FISITA Congress: 3-37.
    • Moore, D.F. 1975. The Friction of Pneumatic Tyres. Elsevier Scientific Publishing Company.
    • Savkoor, A.R. 1990. Tribology of Tyre Traction on Dry and Wet Roads. Proceedings of the 17th Leeds - Lyon Symposium on Tribology: 213-228.
    • Schipper, D.J. 1990. Transitions in the Lubrication of Concentrated Contacts. PhD Thesis. University of Twente.
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