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Lubricants 2017, 5(2), 12; doi:10.3390/lubricants5020012

The Reduction of Static Friction of Rubber Contact under Sea Water Droplet Lubrication

1
College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China
2
Laboratory of Tribology and Surface Engineering, China University of Petroleum, Beijing 102249, China
*
Authors to whom correspondence should be addressed.
Academic Editor: James E. Krzanowski
Received: 29 March 2017 / Revised: 25 April 2017 / Accepted: 7 May 2017 / Published: 12 May 2017
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Abstract

In this work, a series of experimental tests is carried out in laboratory conditions which set the rubber compound (soft and stiff), the normal load, and the direction of propagation of sea water droplets into the interface of rubber–steel pipe contact as variables. The results show that the maximum static frictions (F) of rubber–pipe contacts increase as the normal load increases in both dry and lubricating conditions, and the values of F for the softer rubber are higher than that for the stiffer rubber. However, significant reduction in static friction is found due to the lubrication of sea water droplets. The influence of lubrication is stronger when the droplets propagate into the contact interfaces at the tail edge than that at the front edge. Capture sequences of the contact region facilitate the lubrication of seawater droplets by accelerating the progress of separation in the contact interfaces, thus reducing the static friction force. This investigation improves our understanding of the lubrication of sea water droplets during pipe-laying operation, and it will help us to conduct further research on the accuracy and safety of offshore engineering. View Full-Text
Keywords: rubber; sea water droplet; lubrication; static friction rubber; sea water droplet; lubrication; static friction
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Zhou, Y.-J.; Wang, D.-G.; Guo, Y.-B. The Reduction of Static Friction of Rubber Contact under Sea Water Droplet Lubrication. Lubricants 2017, 5, 12.

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