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HARTL, M., FUIS, V., LIŠKA, M.
Original Title
Experimental study of lubricant film thickness behavior in the vicinity of real asperities passing through lubricated contact
Type
journal article - other
Language
English
Original Abstract
This paper presents an experimental study of the influence of real surface micro-geometry on the film thickness in a circular elastohydrodynamic (EHD) contact formed between a real, random, rough surface of steel ball and smooth glass disc. The Phase Shifting Interferometry has been used to measure in situ initial undeformed rough surface profiles whereas Thin Film Colorimetric Interferometry has provided accurate information about micro EHD film thickness behavior over a wide range of rolling speed. Two real roughness features were studied in detail 56 nm high ridge and 90 nm deep groove, both transversely oriented to the direction of surface motion. It has been shown that ridge is heavily deformed in a loaded contact and its height increases with increasing rolling speed. The asperity tip film thickness behavior is quite similar to the contact average film thickness when the film thickness is higher than the undeformed ridge height. However below this limit the film is thicker than what the EHD theory predicts. For the groove, a local reduction in film thickness at the leading edge has been observed. When the groove is passing through the EHD conjunction, it maintains its undeformed shape. The behavior of both roughness features studied shows good agreement with previous experimental observations conducted using artificially-produced ridge and groove.
Keywords
film thickness; elastohydrodynamic
Authors
RIV year
2004
Released
1. 9. 2004
ISBN
0569-8197
Periodical
Tribology Transactions
Year of study
47
Number
3
State
United States of America
Pages from
376
Pages to
385
Pages count
10
BibTex
@article{BUT42401, author="Martin {Hartl} and Ivan {Křupka} and Vladimír {Fuis} and Miroslav {Liška}", title="Experimental study of lubricant film thickness behavior in the vicinity of real asperities passing through lubricated contact", journal="Tribology Transactions", year="2004", volume="47", number="3", pages="10", issn="0569-8197" }