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Lubricants 2015, 3(2), 437-446; doi:10.3390/lubricants3020437

An Insight to High Humidity-Caused Friction Modulation of Brake by Numerical Modeling of Dynamic Meniscus under Shearing

1
Department of Mechanical Engineering, Lamar University, Beaumont, TX 77710, USA
2
College of IT & Engineering, Marshall University, Huntington, WV 25755, USA
3
Department of Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Jeffrey L. Streator
Received: 17 October 2014 / Revised: 8 April 2015 / Accepted: 29 April 2015 / Published: 19 May 2015
(This article belongs to the Special Issue Numerical Simulation of Static and Dynamic Friction)
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Abstract

To obtain an insight to high humidity-caused friction modulation in brake pad-rotor interface, the adhesion phenomenon due to a liquid bridge is simulated using an advanced particle method by varying the shearing speed of the interface. The method, called generalized interpolation material point for fluid-solid interactions (GIMP-FSI), was recently developed from the material point method (MPM) for fluid-solid interactions at small scales where surface tension dominates, thus suitable for studying the partially wet brake friction due to high humidity at a scale of 10 m. Dynamic capillary effects due to surface tension and contact angles are simulated. Adhesion forces calculated by GIMP-FSI are consistent with those from the existing approximate meniscus models. Moreover, the numerical results show that capillary effects induce modulations of adhesion as slip speed changes. In particular, the adhesion modulation could be above 30% at low speed. This finding provides insights into how the high humidity-caused friction could cause modulations of brake, which are unable to be achieved by conventional models. Therefore, the numerical analysis helps to elucidate the complex friction mechanisms associated with brakes that are exposed to high humidity environments. View Full-Text
Keywords: meniscus; adhesion; capillary; brake friction; MPM; fluid-solid interactions meniscus; adhesion; capillary; brake friction; MPM; fluid-solid interactions
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, L.; Chen, G.S.; Chang, J. An Insight to High Humidity-Caused Friction Modulation of Brake by Numerical Modeling of Dynamic Meniscus under Shearing. Lubricants 2015, 3, 437-446.

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