A velocity dependent friction law is introduced into a three dimensional (3D) transient FE model of wheel-rail rolling contact to investigate its influence on detailed contact solutions in elasticity. Corresponding solutions of Coulomb's friction law with a constant coefficient of friction are also obtained for comparison. Focus is placed on the tangential solutions because the FE solutions confirm the negligible influence of the dependence on the normal contact. In the tangential plane, very high frequency oscillations are excited by the dependence in the trailing part of contact patch where micro-slip occurs. This is similar to the non-uniform sliding or tangential oscillations observed in sliding contact. The micro-slip distribution varies greatly with time. However, the surface shear stress does not change correspondingly. Furthermore, the surface shear stress distribution significantly changes with the employed friction model, especially in the trailing part of contact patch.
Three-dimensional finite element solution of wheel-rail rolling contact with velocity dependent friction
2012
10 Seiten, 15 Bilder, 1 Tabelle, 19 Quellen
Conference paper
English
An Investigation of Velocity-Dependent Friction in Wheel-Rail Rolling Contact
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