A pin-on-disc tribometer study of friction at low contact pressures and sliding speeds for a disc brake material combination

Jens, Wahlstrom (2019) A pin-on-disc tribometer study of friction at low contact pressures and sliding speeds for a disc brake material combination. A pin-on-disc tribometer study of friction at low contact pressures and sliding speeds for a disc brake material combination, 4. p. 100051. ISSN 2590-1230

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Abstract

Disc brake creep groan is a stick-slip phenomenon which results in a low frequency noise in road vehicles that could occur at low vehicle speeds and brake torques. Simulation approaches are used predict the stick-slip phenomena for disc brakes. These approaches depend on the friction model used. Tribometers can be used to map how the local coefficient of friction (CoF) depends on the contact pressure (p) and sliding speed (v). A CoF pv-map can be used as friction model in simulation approaches. There is a lack of CoF maps at low contact pressures and sliding speeds are reported in the literature. The aim of the presented study is to map the CoF for a disc brake material combination at low contact pressures (0.03–0.28 MPa) and sliding speeds (0–3.8 mm/s). The result shows that the friction decreases with increased contact pressure and sliding speed for the specific material combination tested and the test conditions used. More studies are needed to further investigate the validity of the results.

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