In the case of a rolling pneumatic tyre, the existence of an adequate micro-roughness at the tips of road surface asperities is essential to provide adhesion between tyre tread elements and road under wet conditions. In the absence of this micro-roughness, the slipping rubber in the contact area generates hydrodynamic pressure wedges on individual asperities of the road texture tending to entrain a liquid film over asperity peaks. Such elastohydrodynamic action separates tyre tread and surface locally and produces a dangerous condition known as viscous hydroplaning. A criterion for establishing the size of micro-roughness necessary for counteracting this phenomenon is obtained from the corresponding elastohydrodynamic film thickness which would exist in the case of smooth asperity peaks. (Wassmann)


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    Title :

    Tyre traction under elastohydrodynamic conditions


    Additional title:

    Zugkraft des Reifens bei elastohydrodynamischen Bedingungen


    Contributors:
    Moore, D.F. (author)


    Publication date :

    1981


    Size :

    7 Seiten, 6 Bilder, 1 Tabelle, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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