Effect of spherical dents on microstructure evolution and rolling contact fatigue of wheel/rail materials

The determination of creep forces has always been one of the fundamental goals for a wheel-rail contact model. A wheel-rail contact model is expected to consider the degraded adhesion phenomena since they aect the accuracy of the model. Degraded adhesion is observed extensively in the wheel-rail interface, but the law of adhesion coecient is dicult to obtain since it includes complex non-linear behaviour. This paper introduces a local de- graded adhesion model applied to multibody dynamics simulation. It takes large sliding and adhesion recovery at the contact interface into considera- tion. The approximated approach is based on the FASTSIM algorithm and the Polach theory to solve the tangential contact problem on determining creep forces. The model is validated by the comparison with experimental results.