Friction Of Smooth And Textured Non-conformal
Surfaces Under Starved Conditions
Author(s)
F. Ali, I. Křupka & M. Hartl
Abstract
This paper presents an experimental study about the friction of non-conformal
point contacts (ball-on-disk) under starved lubrication. Experiments were carried
out by using a Tribometer equipped with a torque sensor for measuring the
friction force and a digital camera for creating optical interferometric images.
The aim of this study is to measure the friction coefficient in the sliding motion
with the presence of a little amount of lubrication in the inlet of contact between
the ball and disk and to investigate the effect of oil-air meniscus distance from
the center of Hertzian contact on the friction between mating surfaces. In
addition, the reduction of friction by artificially-produced shallow micro-dents
was tested 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 the 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
region of Hertzian contact. However, shallow micro-dents helped in reducing the
friction under severe starvation conditions while the benefits of micro-dents were
nearly negligible for fully flooded conditions.
Keywords: friction, textured surfaces, non-conformal, starved lubrication.
Keywords
friction, textured surfaces, non-conformal, starved lubrication
Related Book
Other papers in this volume
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