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Study of the falling friction effect on rolling contact parameters

Study of the falling friction effect on rolling contact parameters
Study of the falling friction effect on rolling contact parameters
The existence of a wheel–rail friction coefficient that depends on the slip velocity has been associated in the literature with important railway problems like the curving squeal and certain corrugation problems in rails. Rolling contact models that take into account this effect were carried out through the so-called Exact Theories adopting an exact elastic model of the solids in contact, and Simplified Theories which assume simplified elastic models such as Winkler. The former ones, based on Kalker’s Variational Theory, give rise to numerical problems; the latter ones need to adopt hypotheses that significantly deviate from actual conditions, leading to unrealistic solutions of the contact problem. 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 to get steady-state conditions of rolling contact by means of regularisation of the Coulomb’s law is proposed. The model allows establishing relationships in order to estimate the global properties (creepage velocities vs. total longitudinal forces) through local properties (local slip velocity vs. coefficient of friction) or vice versa. The proposed model shows a good agreement with experimental tests while solving the numerical problems previously mentioned.
1023-8883
Giner, J.
2f477262-6eac-4079-8d1f-5af557c0bdb4
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Vila, P.
4b030543-c8de-463f-a6e0-50ce17d5d271
Alonso, A.
1939498b-2ed5-4f86-8ce8-e0f9974880e1
Giner, J.
2f477262-6eac-4079-8d1f-5af557c0bdb4
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Vila, P.
4b030543-c8de-463f-a6e0-50ce17d5d271
Alonso, A.
1939498b-2ed5-4f86-8ce8-e0f9974880e1

Giner, J., Baeza, L., Vila, P. and Alonso, A. (2017) Study of the falling friction effect on rolling contact parameters. Tribology Letters, 65 (1). (doi:10.1007/s11249-016-0810-8).

Record type: Article

Abstract

The existence of a wheel–rail friction coefficient that depends on the slip velocity has been associated in the literature with important railway problems like the curving squeal and certain corrugation problems in rails. Rolling contact models that take into account this effect were carried out through the so-called Exact Theories adopting an exact elastic model of the solids in contact, and Simplified Theories which assume simplified elastic models such as Winkler. The former ones, based on Kalker’s Variational Theory, give rise to numerical problems; the latter ones need to adopt hypotheses that significantly deviate from actual conditions, leading to unrealistic solutions of the contact problem. 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 to get steady-state conditions of rolling contact by means of regularisation of the Coulomb’s law is proposed. The model allows establishing relationships in order to estimate the global properties (creepage velocities vs. total longitudinal forces) through local properties (local slip velocity vs. coefficient of friction) or vice versa. The proposed model shows a good agreement with experimental tests while solving the numerical problems previously mentioned.

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Accepted/In Press date: 31 December 2016
e-pub ahead of print date: 10 January 2017
Published date: March 2017
Additional Information: cited By 0
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 409815
URI: http://eprints.soton.ac.uk/id/eprint/409815
ISSN: 1023-8883
PURE UUID: 0da50903-5644-4f79-b865-d480e8c49c59
ORCID for L. Baeza: ORCID iD orcid.org/0000-0002-3815-8706

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Date deposited: 01 Jun 2017 04:08
Last modified: 15 Mar 2024 13:56

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Contributors

Author: J. Giner
Author: L. Baeza ORCID iD
Author: P. Vila
Author: A. Alonso

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