A pin-on-disc investigation of novel nanoporous composite-based and conventional brake pad materials focussing on airborne wear particles

Wear debris from brake system materials: A multi-analytical characterization approach

“…Disc average roughness was Ra=3.6 µm. A climate chamber was used as a closed box with control of the cleanness of the incoming air [20][21]. In the following, this wear testing conditions will be referred to as condition 1.…”

Contact Pressure and Sliding Velocity Maps of the Friction, Wear and Emission from a Low-Metallic/Cast-Iron Disc Brake Contact Pair

“…The tests were performed in a pin-on-disc tribometer that has been used for a number of emission studies of disc brake contact pairs in the past [14], [15], [19], [20]. In this setup, the disc specimen is mounted horizontally and is rotated by an electrical motor up to rotational speeds of 3000 rpm.…”

“…The material tests are usually run at constant sliding velocity and normal load, and the outputs are the coefficient of friction and the wear rate. In order to also study particle emissions, the cleanness of the air that surrounds the test specimens needs to be controlled as described by Wahlström et al [15].…”

“…They used one nominal contact pressure and one sliding velocity. None of the above-mentioned studies investigated the friction, wear, and particle emission dependence of both the nominal contact pressure and the sliding velocity, which can be mapped as proposed by Lim and Ashby [15]. These kinds of maps have been shown to be important for numerical simulations of wear [17], [18].…”

A field study of airborne particle emissions from automotive disc brakes

“…Both noted a maximum peak in the fine fraction at approximately 0.35 mm. Wahlstro¨m et al tested the same type of pad material used here both in a pin-on-disc machine [3][4][5] and at low contact pressures at the component level. 6,7 Their results indicate distributions with maximum peaks at approximately 0.35 mm.…”