To simulate the change rate of the friction coefficient μ with respect to the sliding speed V, that is, the μ-V slope, a model combining macroscale and microscale phenomena is proposed. The macroscale model obtains distributions of the fluid pressure and fiber contact pressure over the whole engagement face, and the microscale model obtains the friction coefficient of each fiber contact through a detailed model for single-protuberance fiber contact. An experiment was conducted to obtain the μ-V slope by changing the wave height of separator faces, and the simulation and experimental results were compared. The combined model is advantageous for representing experimental μ-V relationships at small and large wave heights in comparison with models using only the macroscale behavior. Both experimental and simulation results showed the μ-V slope becoming more negative with increasing wave height. The simulation results revealed possible causes for the negative slope. In the wavy separator, the fluid friction that contributes to the positive slope is difficult to achieve due to the large film thickness, and the load-sharing ratio of the fiber contact tends to decrease due to wedge action of the fluid film. These phenomena shift the μ-V slope to the negative.
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January 2019
Research-Article
Simulation of the Friction Coefficient of Paper-Based Wet Clutch With Wavy Separators
Fumitaka Yoshizumi,
Fumitaka Yoshizumi
Toyota Central R&D Labs., Inc.,
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: fyoshi@mosk.tytlabs.co.jp
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: fyoshi@mosk.tytlabs.co.jp
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Hirofumi Tani,
Hirofumi Tani
Toyota Central R&D Labs., Inc.,
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: h-tani@mosk.tytlabs.co.jp
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: h-tani@mosk.tytlabs.co.jp
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Shuzo Sanda
Shuzo Sanda
Research Center for High Efficiency Hydrogen
Engine & Engine Tribology,
Tokyo City University,
1-28-1 Tamazutsumi Setagaya-ku,
Tokyo 158-8557, Japan
e-mail: ssanda@tcu.ac.jp
Engine & Engine Tribology,
Tokyo City University,
1-28-1 Tamazutsumi Setagaya-ku,
Tokyo 158-8557, Japan
e-mail: ssanda@tcu.ac.jp
Search for other works by this author on:
Fumitaka Yoshizumi
Toyota Central R&D Labs., Inc.,
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: fyoshi@mosk.tytlabs.co.jp
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: fyoshi@mosk.tytlabs.co.jp
Hirofumi Tani
Toyota Central R&D Labs., Inc.,
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: h-tani@mosk.tytlabs.co.jp
41-1 Yokomichi,
Nagakute 480-1192, Aichi, Japan
e-mail: h-tani@mosk.tytlabs.co.jp
Shuzo Sanda
Research Center for High Efficiency Hydrogen
Engine & Engine Tribology,
Tokyo City University,
1-28-1 Tamazutsumi Setagaya-ku,
Tokyo 158-8557, Japan
e-mail: ssanda@tcu.ac.jp
Engine & Engine Tribology,
Tokyo City University,
1-28-1 Tamazutsumi Setagaya-ku,
Tokyo 158-8557, Japan
e-mail: ssanda@tcu.ac.jp
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 18, 2018; final manuscript received July 4, 2018; published online August 13, 2018. Assoc. Editor: Stephen Boedo.
J. Tribol. Jan 2019, 141(1): 011702 (13 pages)
Published Online: August 13, 2018
Article history
Received:
April 18, 2018
Revised:
July 4, 2018
Citation
Yoshizumi, F., Tani, H., and Sanda, S. (August 13, 2018). "Simulation of the Friction Coefficient of Paper-Based Wet Clutch With Wavy Separators." ASME. J. Tribol. January 2019; 141(1): 011702. https://doi.org/10.1115/1.4040806
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