This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Thermomechanical Analysis of Friction Brakes
Technical Paper
2000-01-2775
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Frictional work in sliding contacts plays an important role in tribology and other related areas. Applications may be found in many engineering fields. Braking of vehicles is almost exclusively done by friction brakes, and thus, understanding of the mechanisms involved is an area of great concern when designing a brake system. From a theoretical as well as experimental viewpoint, little is actually known about the location, magnitude and distribution of pressure and temperature between sliding bodies. This is especially true when considering high energy sliding contacts, such as in brakes and clutches.
The present paper concerns the calculation of temperature and pressure distribution between two sliding bodies. More specifically, an instability phenomenon known as TEI (ThermoElastic Instability), which is frequently observed in experiments is investigated. TEI occurs on both the friction material and the opposing sliding material. This is a major cause for excessive temperatures and consequently wear. TEI on the friction material appears as slowly moving contact points. The cause for this is an interaction between wear and thermal expansion. In this paper, the sliding material is modeled as a smooth rigid surface but thermally conductive.
To calculate the interface pressure and temperature, a continuum thermomechanical wear model is used. The model can handle temperature dependent variables, such as the friction and wear. The thermomechanical wear model is discretized by finite elements, and to solve the resulting system of equations a Newton type method is used.
The model shows promising results and both temperature and pressure distributions are believed to be properly determined. It is also shown, that the motion of the contact points on the friction material is indeed an interaction between wear and thermal expansion. The model can provide qualitative recommendations regarding friction material properties.
Recommended Content
Citation
Thuresson, D., "Thermomechanical Analysis of Friction Brakes," SAE Technical Paper 2000-01-2775, 2000, https://doi.org/10.4271/2000-01-2775.Also In
References
- Pang J. S. “Newton's Method for B-differentiable Equations,” Mathematics of Operations Research 15 311 341 1990
- Strömberg N. “Thermomechanical Modelling of Tribological Systems,” Division of Mechanics Linköping Linköping University 1997 136
- Oancea V. G. Laursen T. A. “A Finite Element Formulation of Thermomechanical Rate-Dependent Frictional Sliding,” International Journal for Numerical Methods in Engineering 40 4275 4311 1997
- Yevtushenko A. I. “Determination of temperatures for sliding contact with applications for braking systems,” Wear Switzerland vol. 206 no. 1-2 pp. 53 59 May 1997 1997
- Yevtushenko A. Chapovska R. “Effect of time-dependent speed on frictional heat generation and wear in transient axisymmetrical contact of sliding,” Archive of Applied Mechanics 67 331 338 1997
- Vick B. Furey M. J. Foo S. J. “Boundary Element Thermal Analysis of Sliding Contact,” Numerical Heat Transfer, Part A: Applications 20 19 40 1991
- Sonn H. W. Kim C. G. Hong C. S. “Transient Thermoelastic Analysis of Composite Brake Discs,” Journal of Reinforced Plastics and Composites 14 1337 1361 1995
- Schneider L. Schmierungstechnik 19 205 209 1988
- Bowden F. P. Tabor D. The Friction and Lubrication of Solids Oxford Clerendon Press 1964
- Vernersson T. “Thermally Induced Roughness of Tread Braked Railway Wheels - a Noise-Related Problem,” Division of Solid Mechanics Göteborg Chalmers University of Technology 1997 77
- Berry G. A. Barber J. R. “The Division of Heat - A Guide to the Nature of Sliding Contact,” Journal of Tribology 106 405 415 1984
- Petersson M. “Noise-Related Roughness of Railway Wheels,” Dep. of Solid Mechanics Göteborg Chalmers University of Technology 1999
- Bathe K.-J. Finite Element Procedures New Jersey Prentice Hall, Inc. 1996
- Christensen P. W. Klarbring A. Pang J. S. Strömberg N. “Formulation and Comparison of Algorithms for Frictional Contact Problems,” International Journal for Numerical Methods in Engineering 42 145 173 1998