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Analysis of lubricated compliant contact

By Kryštof Dočkal

Abstract

This diploma thesis deals with the proposal of methodology for film thickness eva- luation within compliant contacts. With respect to characteristics of such contact pairs, like variable film thickness, high surface roughness, or poor conductivity and reflectivity, the usage of conventional experimental methods is particularly complicated. In present study, an optical method based on the principle of fluo- rescent microscopy was employed in present thesis. An evaluation algorithm in- volving background normalization and calibration of fluorescent intensity to film thickness was created in a form of experimental software. The proposed algori- thm was validated by using elastohydrodynamic contact formed between ceramic ball and glass disc. The measured film thickness was compared with theoretical prediction, while very good agreement of obtained data was observed. Further, a series of experiments with compliant samples was conducted, while the central film thickness was evaluated as a function of mean speed, applied lubricant, ap- plied load and slide-to-roll ratio. The last part of the thesis is focused on results analysis and discussion considering the previously published literature

Topics: fluorescenční mikroskopie; Poddajný kontakt; isoviscose; elastohydrodynamické mazání; elastohydrodynamic lubrication; isoviskózní; ball-on-disk; film thickness; fluorescence microscopy; Compliant contact; ball-on-disc; tloušťka filmu
Publisher: Vysoké učení technické v Brně. Fakulta strojního inženýrství
Year: 2015
OAI identifier: oai:invenio.nusl.cz:231789
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