Tribological properties of dry,fluid, and boundary friction |
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Authors: | I A Lyashenko |
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Institution: | (1) Department of Tribology, Kielce University of Technology, Al. 1000 lecia PP 7, 25-314 Kielce, Poland;(2) Department of Chemical Technology and Environmental Protection, University of Lódź, Pomorska 163, 90-236 Łódź, Poland; |
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Abstract: | A friction pair is studied under lubricant-free dry friction, hydrodynamic, and boundary lubricant conditions. It is shown
that, in dry friction, the number of harmonics in the time dependence of the coordinate of the lower rubbing block decreases
with increasing frequency of an applied periodic action until the interacting surfaces stick when a critical frequency is
exceeded. The surfaces then move together. The behavior of a friction pair with a lubricant made of a Newtonian fluid, pseudoplastic
fluid, or dilatant non-Newtonian fluid is analyzed in the hydrodynamic case. It is found that a pseudoplastic fluid or a boundary
lubricant leads a intermittent (stick-slip) friction mode, which is one of the main causes of fracture of rubbing parts, over
a wide parametric range. |
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Keywords: | |
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