Techno Press

Steel and Composite Structures   Volume 19, Number 4, October 2015, pages 939-952
Brass fillers in friction composite materials: Tribological and brake squeal characterization for suitable effect evaluation
Mohamed Kchaou, Amira Sellami, Abd. Rahim Abu Bakar, Ahmad Razimi Mat Lazim, Riadh Elleuch and Senthil Kumar

Abstract     [Full Text]
    In this paper, brake pad performance of two organic matrix composites namely, Sample 1 (contains no brass filler) and Sample 2 (contains 1.5% brass filler), is studied based on tribological and squeal noise behavior. In the first stage, a pin-on-disc tribometer is used to evaluate the frictional behavior of the two pads. On the following stage, these pads are tested on squeal noise occurrence using a drag-type brake dynamometer. From the two type of tests, the results show that; (i) brass fillers play a dual role; firstly as reinforcing element of the brake pad providing primary contact sites, and secondly as solid lubricant by contributing to the formation of a layer of granular material providing velocity accommodation between the pad and the disc; (ii) brass fillers contribute to friction force stabilization and smooth sliding behavior; (iii) the presence of small weight quantity of brass filler strongly contributes to squeal occurrences; (iv) there is close correlation between pin-on-disc tribometer and brake dynamometer tests in terms of tribological aspect.
Key Words
    friction materials; tribological behavior; brass filler; squeal noise; rubbed surface
(1) Mohamed Kchaou, Amira Sellami, Riadh Elleuch:
University of Sfax - ENIS — LASEM - BP 3038 Sfax — Tunisia;
(2) Abd. Rahim Abu Bakar, Ahmad Razimi Mat Lazim:
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor, Malaysia;
(3) Senthil Kumar:
Department of Mechanical Engineering, P.A. College of Engineering and Technology, Pollachi 642002, Tamilnadu, India.

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