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Friction Coefficient Variation Mechanism under Wet Condition in Disk Brake (Variation Mechanism Contributing Wet Wear Debris)
- Tadayoshi Matsumori - Toyota Central R&D Labs Inc. ,
- Yoshitsugu Goto - Toyota Central R&D Labs Inc. ,
- Noboru Sugiura - Toyota Central R&D Labs Inc. ,
- Kenji Abe - Toyota Motor Corp. ,
- Yoshihiro Osawa - Toyota Motor Corp. ,
- Yosuke Akita - Toyota Motor Corp. ,
- Satoshi Wakamatsu - ADVICS Co. Ltd. ,
- Katsuya Okayama - ADVICS Co. Ltd. ,
- Kyoko Kosaka - ADVICS Co. Ltd.
ISSN: 1946-3995, e-ISSN: 1946-4002
Published September 18, 2016 by SAE International in United States
Citation: Matsumori, T., Goto, Y., Sugiura, N., Abe, K. et al., "Friction Coefficient Variation Mechanism under Wet Condition in Disk Brake (Variation Mechanism Contributing Wet Wear Debris)," SAE Int. J. Passeng. Cars - Mech. Syst. 9(3):1227-1234, 2016, https://doi.org/10.4271/2016-01-1943.
This paper deals with friction under wet condition in the disk brake system of automobiles. In our previous study, the variation of friction coefficient μ was observed under wet condition. And it was experimentally found that μ becomes high when wear debris contains little moisture. Based on the result, in this paper, we propose a hypothesis that agglomerates composed of the wet wear debris induce the μ variation as the agglomerates are jammed in the gaps between the friction surfaces of a brake pad and a disk rotor. For supporting the hypothesis, firstly, we measure the friction property of the wet wear debris, and confirm that the capillary force under the pendular state is a factor contributing to the μ variation. After that, we simulate the wear debris behavior with or without the capillary force using the particle-based simulation. We prepare the simulation model for the friction surfaces which contribute to the friction force through the wear debris. The simulation results support our hypothesis, that is, under the wet condition assuming the pendular state, the agglomerates of particles are created and contribute to the increase of μ.