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17 results on '"Trausmuth, Andreas"'

5. Influence of the evolution of near-surface rail wheel microstructure on crack initiation by micro-bending investigations.

Author

Freisinger, Matthias, Trausmuth, Andreas, Hahn, Rainer, and Badisch, Ewald

Abstract

Severe mechanical and thermal loadings, as well as the corrosive environment change the near-surface microstructure of rail wheels during service. Resulting severely plastically deformed (SPD) and corrosion affected microstructures are prone to influence crack initiation along the wheel tread. To evaluate the crack initiation and fracture behaviour, the in-situ micro-bending method is first applied on rail wheel samples from field within this work. Results reveal detailed insights in material behaviour of SPD microstructures, where the conducted micro-bending investigations point out predominant plastic behaviour without cracks initiated at the artificial notch of the micro-cantilevers during bending. In contrast, micro-bending investigations in microstructural regions with increased oxygen and silicon composition show crack initiation, fracture, and low maximum stress levels (approximately one seventh of the SPD microstructure). The presented study underlines the increased risk of crack initiation in corrosion affected regions by a novel testing method in this field with high spatial resolution and acknowledge the importance of periodic reprofiling of the rail wheels in service. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Modelling of Tribological Conditions During the Mesh of Gear Teeth

Author

Basan, Robert, Vrcan, Željko, Lengauer, Markus, Franulović, Marina, Trausmuth, Andreas, Eichsleder, Wilfried, and Grün, Florian

Subjects
tooth flank contact, lubricating conditions, elastohydrodynamic lubrication, pressure calculation, human activities
Abstract

Variations of tribological conditions such as coefficient of friction, loading etc. during the meshing cycle cause difficulties in the simulation and analysis of gear teeth contact. The normal and tangential load profiles acting on gear tooth flanks during the mesh are usually determined using Hertzian theory and Coulomb’s law of friction, which are valid for dry and mixed-mode lubricating conditions, but unsuitable for the case of elastohydrodynamic (EHD) lubrication conditions due to a local pressure extreme in the outer part of the contact area. The coefficient of friction also varies along the path of contact in EHD lubrication conditions and must be calculated for each point during the mesh. This paper presents a mathematical model and procedure for the calculation of the pressure profile and the local pressure extreme under conditions of EHD lubrication, together with a model for the calculation of the coefficient of friction between tooth flanks in contact. The procedure is very convenient for applications in numerical analysis as it enables determination of normal/tangential loading profiles and values of the coefficient of friction at desired number of points along the tooth flank during the loading cycle.

Published
2012

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