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Experimental investigation of the relationship between noise occurrence and the load-bearing area in dry sliding contact

Abstract : Friction brakes can induce vibrations and noise, including squealing, which is a major public health concern. Squeal results from dynamic instabilities, leading to high amplitude vibrations and intense noise emissions. Although the phenomenon is well known, the origin of squealing occurrences remains poorly understood. It is recognized that squealing is related to many factors, including the wear of the friction parts. However, the multi-scale nature of physical couplings, the complexity of friction materials and the closed nature of contact are all obstacles to understanding its appearance.This experimental work is based on the third-body approach and the notion of a tribological circuit to explore the mechanisms originating squeal, considering that flows of third body at the interface continuously change the friction surfaces and thus the load-bearing area during the slip.The objective of the work is to examine the link between the change of the third body, that of the tribological triplet and the appearance of noise in dry friction conditions. For this purpose, an elementary tribometer dedicated to the analysis of contact vibrations is used, the experiment allowing a monitoring of the interface through a transparent disc and a control of the tribological circuit by the use of an artificial third body and an appropriate contact configuration. The results show in particular that the appearance of squealing is strongly related to the densification and redistribution of the third-body layer in the contact during sliding
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Submitted on : Tuesday, September 1, 2020 - 11:35:08 AM
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Narinder Singla. Experimental investigation of the relationship between noise occurrence and the load-bearing area in dry sliding contact. Mechanics [physics]. Ecole Centrale de Lille, 2019. English. ⟨NNT : 2019ECLI0020⟩. ⟨tel-02926969⟩

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