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Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films

A high-performance microscopic observation system was developed and integrated with a purpose-built pin-on-disk type tribotester. This allows for simultaneous in situ measurements of the vertical displacement and friction force of a pin sliding on disks lubricated with nanometer-thick liquid films a...

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Main Authors:	Zhang, Hedong, Takeuchi, Yusuke, Chong, William W. F., Mitsuya, Yasunaga, Fukuzawa, Kenji, Itoh, Shintaro
Format:	Article
Published:	Elsevier Ltd. 2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/84167/ https://doi.org/10.1016/j.triboint.2018.05.043
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id	my.utm.84167
record_format	eprints
spelling	my.utm.841672019-12-16T03:20:36Z http://eprints.utm.my/id/eprint/84167/ Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films Zhang, Hedong Takeuchi, Yusuke Chong, William W. F. Mitsuya, Yasunaga Fukuzawa, Kenji Itoh, Shintaro TJ Mechanical engineering and machinery A high-performance microscopic observation system was developed and integrated with a purpose-built pin-on-disk type tribotester. This allows for simultaneous in situ measurements of the vertical displacement and friction force of a pin sliding on disks lubricated with nanometer-thick liquid films at velocities up to 0.1 m/s, with accuracies of approximately 0.6 nm and 10 μN. Upward pin displacement was observed, exhibiting an exponential increase followed by a slight increase with increasing sliding velocity. The pin displacement also increased with film thickness and lubricant viscosity. We conclude that even nanometer-thick liquid lubricant films can generate upward dynamic pressure. Further insight into the shearing process was gained by analyzing the measured friction forces using the Eyring thermal activation energy approach. Elsevier Ltd. 2018 Article PeerReviewed Zhang, Hedong and Takeuchi, Yusuke and Chong, William W. F. and Mitsuya, Yasunaga and Fukuzawa, Kenji and Itoh, Shintaro (2018) Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films. Tribology International, 127 . pp. 138-146. ISSN 0301-679X https://doi.org/10.1016/j.triboint.2018.05.043
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Zhang, Hedong Takeuchi, Yusuke Chong, William W. F. Mitsuya, Yasunaga Fukuzawa, Kenji Itoh, Shintaro Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
description	A high-performance microscopic observation system was developed and integrated with a purpose-built pin-on-disk type tribotester. This allows for simultaneous in situ measurements of the vertical displacement and friction force of a pin sliding on disks lubricated with nanometer-thick liquid films at velocities up to 0.1 m/s, with accuracies of approximately 0.6 nm and 10 μN. Upward pin displacement was observed, exhibiting an exponential increase followed by a slight increase with increasing sliding velocity. The pin displacement also increased with film thickness and lubricant viscosity. We conclude that even nanometer-thick liquid lubricant films can generate upward dynamic pressure. Further insight into the shearing process was gained by analyzing the measured friction forces using the Eyring thermal activation energy approach.
format	Article
author	Zhang, Hedong Takeuchi, Yusuke Chong, William W. F. Mitsuya, Yasunaga Fukuzawa, Kenji Itoh, Shintaro
author_facet	Zhang, Hedong Takeuchi, Yusuke Chong, William W. F. Mitsuya, Yasunaga Fukuzawa, Kenji Itoh, Shintaro
author_sort	Zhang, Hedong
title	Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
title_short	Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
title_full	Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
title_fullStr	Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
title_full_unstemmed	Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
title_sort	simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films
publisher	Elsevier Ltd.
publishDate	2018
url	http://eprints.utm.my/id/eprint/84167/ https://doi.org/10.1016/j.triboint.2018.05.043
_version_	1654960050122260480
score	13.211869

Simultaneous in situ measurements of contact behavior and friction to understand the mechanism of lubrication with nanometer-thick liquid lubricant films

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