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A study of the falling friction effect on contact parameters through exact contact models

A study of the falling friction effect on contact parameters through exact contact models
A study of the falling friction effect on contact parameters through exact contact models
The dependence of the coefficient of friction on the local slip velocity has been associated in the literature with many important railway problems such as the squeal noise that occurs in narrow curves, certain types of corrugation of rails, braking, etc. In order to consider this effect, some researchers have tried to develop models usually based on simplified theories from Kalker that would not be adequate for considering the falling friction coefficient. In this paper a methodology based on Kalker's variational theory is presented, in which a local slip velocity-dependent friction law is considered. A formulation is proposed to first obtain, steady-state conditions of contact through an exact elastic model and second, macro-properties (creepage velocities versus total longitudinal forces) through local-properties (local slip velocity versus coefficient of friction) and vice versa. Additionally, the unsteady variational theory by Kalker is modified by introducing a regularisation of the Coulomb's law. Numerical and computational improvements and non-stationary convergence strategies are discussed.
Civil-Comp Press
Giner, J.
56fdf097-c864-40de-9665-282522adb35e
Vila, P.
4b030543-c8de-463f-a6e0-50ce17d5d271
Alonso, A.
1939498b-2ed5-4f86-8ce8-e0f9974880e1
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Pombo, J.
Giner, J.
56fdf097-c864-40de-9665-282522adb35e
Vila, P.
4b030543-c8de-463f-a6e0-50ce17d5d271
Alonso, A.
1939498b-2ed5-4f86-8ce8-e0f9974880e1
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Pombo, J.

Giner, J., Vila, P., Alonso, A. and Baeza, L. (2014) A study of the falling friction effect on contact parameters through exact contact models. Pombo, J. (ed.) In Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance. vol. 104, Civil-Comp Press.. (doi:10.4203/ccp.104.190).

Record type: Conference or Workshop Item (Paper)

Abstract

The dependence of the coefficient of friction on the local slip velocity has been associated in the literature with many important railway problems such as the squeal noise that occurs in narrow curves, certain types of corrugation of rails, braking, etc. In order to consider this effect, some researchers have tried to develop models usually based on simplified theories from Kalker that would not be adequate for considering the falling friction coefficient. In this paper a methodology based on Kalker's variational theory is presented, in which a local slip velocity-dependent friction law is considered. A formulation is proposed to first obtain, steady-state conditions of contact through an exact elastic model and second, macro-properties (creepage velocities versus total longitudinal forces) through local-properties (local slip velocity versus coefficient of friction) and vice versa. Additionally, the unsteady variational theory by Kalker is modified by introducing a regularisation of the Coulomb's law. Numerical and computational improvements and non-stationary convergence strategies are discussed.

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Published date: 2014
Additional Information: cited By 0

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Local EPrints ID: 412280
URI: https://eprints.soton.ac.uk/id/eprint/412280
PURE UUID: 453017a2-af27-4059-9511-6cd70a71625e
ORCID for L. Baeza: ORCID iD orcid.org/0000-0002-3815-8706

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Date deposited: 17 Jul 2017 13:25
Last modified: 20 Jul 2019 00:28

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