Experiment to Investigate the Relationship Between the Third-Body Layer and the Occurrence of Squeals in Dry Sliding Contact
- 91 Downloads
Braking is an energy dissipation mechanism used to restrict the movement of vehicles. Friction brakes may induce vibrations and noise. These effects constitute a major shortcoming related to the functioning of friction braking systems. Known as brake squeal, this phenomenon involves unstable vibrations induced by coupling modes between components in frictional contact leading to large amplitude vibrations. Despite significant progress in experimental techniques and numerical modeling, the origin of squeal occurrence remains misunderstood and is still a matter of debate. It is, however, commonly admitted that squeal is affected by many different factors on both micro and macro scales. In addition, a close correlation between wear and squeal occurrence in braking system has been reported. This study examines linking the change in the third-body layer with the occurrence of squeals in sliding dry contact. A simplified customized test rig was used with a transparent glass disc and an artificial alumina third-body. Results show that squeal occurrence is strongly linked to the densification and redistribution of the third-body, as well as internal flows in the interface.
KeywordsBrake squeal Friction-induced vibrations Tribological circuit Third-body flows
List of Symbols
- Qs (ext)
External third-body source flow
- Qs (int)
Internal third-body source flow
Third-body recirculation flow
Internal third-body flow
The present research work has been supported by the ELSAT2020 project co-financed by the European Union with the European Regional Development Fund, the French State and the Hauts de France Region Council. The authors gratefully acknowledge the support of these institutions.
- 3.Österle, W., Dörfel, I., Prietzel, C., Rooch, H., Cristol-Bulthé, A.-L., Degallaix, G., Desplanques, Y.: A comprehensive microscopic study of third body formation at the interface between a brake pad and brake disc during the final stage of a pin-on-disc test. Wear 267, 781–788 (2009). https://doi.org/10.1016/j.wear.2008.11.023 CrossRefGoogle Scholar
- 4.Kasem, H., Bonnamy, S., Rousseau, B., Estrade-Szwarckopf, H., Berthier, Y., Jacquemard, P.: Interdependence between wear process, size of detached particles and CO2 production during carbon/carbon composite friction. Wear 263, 1220–1229 (2007). https://doi.org/10.1016/j.wear.2007.01.077 CrossRefGoogle Scholar
- 31.Österle, W., Orts-gil, G., Gross, T., Deutsch, C., Hinrichs, R., Vasconcellos, M.A.Z.: Impact of high energy ball milling on the nanostructure of magnetite—graphite and magnetite—graphite—molybdenum disulphide blends. Mater. Charact. 86, 28–38 (2013). https://doi.org/10.1016/j.matchar.2013.09.007 CrossRefGoogle Scholar
- 37.Duboc, M., Magnier, V., Brunel, J., Dufrénoy, P., Chancelier, T.: Influence of contact conditions and pad geometry on disc brake squeal noise. In: European Conference on Braking, JEF2010. pp. 247–254 (2010)Google Scholar