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Airborne Wear Particles Emissions ofCommercial Disc Brake Materials– Disc Brake Test Stand Simulations at LowContact Pressures and Rotors Pre-conditionedwith Rust
KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).ORCID iD: 0000-0003-0696-7506
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Services Engineering.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
2008 (English)Report (Other academic)
Abstract [en]

Most modern passenger cars have disc brakes on the front wheels, which unlike drum brakes are not sealed off to the ambient air. During braking, there is wear to both the rotor and the pads. This wear process generates particles, which may become airborne. A problem with measuring airborne wear particles in field tests is to distinguish them from the background noise. Therefore, a disc brake laboratory test stand that allows control of the cleanness of the surrounding air is used. With this test stand the number and size of the airborne wear particles from the pad to rotor contact can be measured online. In this technical report the results from two test series is presented. The first series were preformed at three brake cylinder pressure levels (1.2, 1.7 and 2.2 bar) and the rotors were pre-conditioned in a climate chamber with an oxide layer (e.g. rust). Ceramic NAO, NAO and low metallic type brake pads were tested. The second test series were conducted at three low brake cylinder pressure levels (0.1, 0.5 and 1 bar) with NAO and low metallic type brake pads, without any oxide layer. Promising results from the first test series indicate that this test stand can be used to study oxide layer removal from the rotor. The results are also promising for the ability to rank the number and size distribution from different pad rotor material combinations. The second test series shows that even at low pressures measurable levels of airborne particles are generated.

Place, publisher, year, edition, pages
2008. , 34 p.
Trita-MMK, ISSN 1400-1179 ; 16
Keyword [en]
Wear, airborne particles, disc brake, oxide layer
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-37245OAI: diva2:432797
QC 20110809Available from: 2011-08-09 Created: 2011-08-07 Last updated: 2011-12-15Bibliographically approved

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Wahlström, JensOlander, LarsOlofsson, Ulf
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