Abstract
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.
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