The effect of external grit particle size on friction coefficients and grit embedment of brake friction material
MetadataShow full item record
Changes in friction and contact surfaces characteristics of a brake friction material during drag and stop mode test were investigated using a brake model tribo-tester. Scanning Electron Microscopy (SEM) was utilized to reveal the surface topography characteristics and analyze the external particle size effects on friction coefficients and grit embedment. Silica sand with three different particle sizes of 50-180 µm, 180-355 µm and 355-500 µm was used in this work. At higher disc sliding speed, results showed that small grit particles cause higher friction due to greater frequency of particles mixing and modifying the effective contact compared to bigger particles. Good friction stability was attributed to smaller particles size providing more stable contact by actively involved in building up and reducing the rate of changes of the effective contact area. Through SEM analysis, signs of formation and disintegration of contact plateaus correlated well with particle size and hence, suggesting the significant role of particle size as wearing mechanism. Grit embedment (GE) was greatly dependent on presence of compacted wear debris as most particles were found embedded into compacted wear debris. Total GE of 2.7% was observed for silica sand of 50-180 µm, 4.5% for 180-355 µm and 3.0% for 355-500 µm.
This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc-nd/3.0/
Showing items related by title, author, creator and subject.
Effects of hard particles on friction coefficients and particle embedment in brake system during hard brakingAbdul Hamid, M.; Stachowiak, Gwidon; Syahrullail, S. (2012)The effects of hard particles on the friction coefficients and particle embedment during hard braking were investigated. Silica sands grit of the size between 180 to 355 µm were used during the experiments. The results ...
Abdul Hamid, M.K.; Stachowiak, Gwidon (2012)The effects of external hard particles on the friction coefficients and its oscillation amplitudes during hard braking were investigated. Silica sands of the size between 180 to 355 µm were used during the experiments. ...
Abdul Hamid, Mohd Kameil; Stachowiak, Gwidon (2009)The effect of hard particle grit size on friction coefficients and particle embedment of braking system was investigated using a model brake test rig. Silica sand grit sizes ranging from 180 - 355 µm were used in drag and ...