Role of contact plateaus on velocity-dependent friction of brake friction composite with steel fibres. (July 2022)

• Record Type: Journal Article
• Authors: Song, Wansu; Gweon, Jaehyun; Park, Jong Sung; Kim, Jinwoo; Kim, Jeongkyu; Jang, Ho
• Is Part Of: Tribology international. Volume 171(2022)
• Publication Date: 2022-07
• Subjects: SEM scanning electron microscopy -- EDX energy-dispersive X-ray -- BEI back-scattered electron image -- SEI secondary electron image -- CEA complex eigenvalue analysis; Brake -- Wear particles -- Surface contact -- Steel fibre; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2022.107568
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The velocity-dependent friction of brake friction composites is investigated, focusing on the contact area on the sliding surface. Friction tests were performed using a reduced scale brake dynamometer. Results showed a considerable velocity dependence for the friction composites with steel fibres owing to the size reduction of wear debris compacts at a low velocity and accompanied high metallic adhesion by stress concentration on the steel fibres. The velocity weakening coefficient, which is included in the empirical equation for the velocity weakening friction, is suggested for predicting friction instability of the friction composite using six commercial products. Highlights: Sizes of primary and secondary plateaus affect velocity weakening of friction. High friction at low velocities is due to the load concentration on primary plateaus. A velocity-weakening coefficient based on a modified Arrhenius model is introduced.