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Steel and Composite Structures
  Volume 19, Number 4, October 2015 , pages 939-952
DOI: https://doi.org/10.12989/scs.2015.19.4.939
 


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
    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
 
Address
(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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