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)
Tyre traction under elastohydrodynamic conditions
Zugkraft des Reifens bei elastohydrodynamischen Bedingungen
Friction and traction. Proc. of the 7th ; 220-226
1981
7 Seiten, 6 Bilder, 1 Tabelle, 6 Quellen
Aufsatz (Konferenz)
Englisch