Abstract
Arrangements and morphologies of Rockwool fibres have a great influence on the brake friction material microstructure, properties and performances. This study aims to establish the link between Rockwool fiber arrangement in the composite friction material and the friction and wear behavior. In order to limit synergistic effects, the adopted approach is based on efficient simplified formulations by the reduction of size distribution and number of constituents. Two different Rockwool fiber arrangements are selected. They are introduced as fiber balls for the first material and as separated fibers for the second one. Tribological behavior and wear mechanisms are investigated and correlated to microstructural properties of the studied materials. It is found that the induced microstructure has an impact on friction coefficient evolution and wear rate. Indeed, homogenous distribution of constituents in the material volume is achieved with the regular size and shape of fiber balls. These latter result in the clustering of conductive particles namely graphite and thus enhances thermal properties. Besides, regular size and uniform distribution of fiber balls contribute to a better supplying of third body in the contact and reduces wear rate. However, big porosities induced by fiber entanglements disrupt the develo** of third-body layer. Therefore, these porosities affect the stability of friction coefficient and generates a low wear resistance.
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Acknowledgements
This work is part of thesis MOBIDOC funded by the European Union under the PASRI program. The authors thank the Ministry of Higher Education and Scientific Research in Tunisia, the Ministry of Foreign Affairs in France. The National Center for Scientific Research, and the Joint Committee of University Cooperation for their support for cooperation between the Laboratoire de Mecanique de Lille and the Laboratoire des Systemes Electro-Mecaniques at the University of Sfax. The authors gratefully acknowledge the International Campus on Safety and Intermodality in Transportation (CISIT), the Nord-Pas-de-Calais Region, the European Community, the Regional Delegation for Research and Technology, the Ministry of Higher Education and Research, and the National Centre for Scientific Research for their continued support of research on braking by friction at Laboratoire de Mecanique de Lille. Special thanks are also due to the STUGAFREM Society (Tunisia) for providing us with the brake lining samples. The authors also gratefully acknowledge the helpful comments and suggestions of the reviewers, which have improved the presentation.
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Makni, F., Hentati, N., Cristol, AL., Desplanques, Y., Elleuch, R. (2023). Effects of Rockwool Fiber Arrangement on the Tribological Behaviour of Composite Brake Friction Materials. In: Walha, L., et al. Design and Modeling of Mechanical Systems - V. CMSM 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-14615-2_98
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DOI: https://doi.org/10.1007/978-3-031-14615-2_98
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