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A finite element model to simulate the physical mechanisms of wear and crack initiation in wheel/rail contact

Research paper by W. Daves, W. Kubin, S. Scheriau, M. Pletz

Indexed on: 14 Jun '16Published on: 09 Jun '16Published in: Wear



Abstract

The presented work describes firstly the wear and crack initiation mechanism using metallographic investigations of deformed surfaces by rolling sliding wheel/rail contact. Secondly, a multi-scale finite element model is presented which allows the simulation of the deformation process near the surface of a rail under rolling sliding contact. It is necessary to model the roughness of the surfaces of wheel and rail to obtain a realistic deformation state which is comparable to experiments. Furthermore, the realistic stick-slip behavior of a rolling sliding wheel along a rail is considered. Regarding these aspects of wheel/rail contact a realistic deformation picture with near quantitative amounts of plastic shear strains from micrometer to millimeter range can be predicted. The numerical results obtained using the multi-scale model can be compared to metallographic observations and deliver a satisfying match.

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