NDLI: Analytical and experimental investigation on friction of non-conformal point contacts under starved lubrication

Content Provider	Springer Nature Link
Author	Ali, Fadi Křupka, Ivan Hartl, Martin
Copyright Year	2012
Abstract	This paper presents an analytical and experimental study on the friction of non-conformal point contacts (ball-on-disk) under starved lubrication. Theoretical models were developed to simulate the behavior of friction and separation versus the degree of starvation while experimental measurements were conducted by using a Tribometer equipped with a torque sensor and a digital camera, which provided the possibility to use the optical interferometry technique simultaneously with measuring the friction. The effect of air-oil meniscus distance from the center of Hertzian contact on the friction between non-conformal surfaces was observed under starved conditions in sliding motion by capturing interferometric images. In addition, the reduction of friction by artificially-produced shallow micro-dents was investigated under severely starved and fully flooded conditions. Results show that the coefficient of friction increases dramatically when the air-oil meniscus starts to touch the circle of Hertzian contact and there is not such a significant difference in the friction between starved and fully flooded contacts since the air-oil meniscus is far away from the borders of Hertzian contact. In other words, the starvation of lubrication causes a high level of fatigue and wear of machine components when there is interference between the air-oil meniscus and the Hertzian contact. However, it was found that shallow micro-dents are helpful in reducing the friction under severe starvation conditions while the benefits of micro-dents are negligible for fully flooded conditions.
Starting Page	545
Ending Page	553
Page Count	9
File Format	PDF
ISSN	00256455
Journal	Meccanica
Volume Number	48
Issue Number	3
e-ISSN	15729648
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-10-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Friction Non-conformal Starved lubrication Micro-dents Mechanics Civil Engineering Automotive Engineering Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Mechanical Engineering

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