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This study is devoted to the computation of realistic stress and strain fields at a local scale in fretting. Models are proposed to improve surface and volume modelling, by taking into account the heterogeneity of stress fields due to the irregular interface. This gives a new view toward damage mechanisms. The surface heterogeneity which is considered here, results from the third body trapped in the...
The goal of this work is to improve understanding of wheel/rail lubricating mechanisms and propose an approach for use in the future to evaluate new lubricants suitable for the wheel flange/rail gauge corner contact. This work is carried out in the framework of the European research program “Urban Track” (project no FP6-31312). Previous works on wheel–rail contacts have highlighted the presence of...
In situ tribometry was used to examine the role of third bodies for the friction and wear behaviour of five hard Ti–Si–C–H coatings produced by plasma-enhanced chemical vapour deposition. Coatings exhibited nanocomposite structures consisting of nanocrystalline titanium carbide surrounded by amorphous carbon containing H and Si (the latter being present in all coatings but one). From nanoindentation...
The present study investigated the role of alloy microstructure and surface roughness on wear and friction behavior of leaded and unleaded tin bronzes. Ball-on-disk experiments were carried out under dry conditions with steel balls sliding against bronze disks. Scanning electron microscopy (SEM), energy dispersive electron microscopy (EDX), x-ray photoelectron spectroscopy (XPS) and Auger electron...
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