A mixed lubrication model incorporating measured surface topography. Part 1: Theory of flow factors

Autor:	Piet Lugt, Pär Marklund, Andreas Almqvist, Fredrik Sahlin, Roland Larsson
Rok vydání:	2009
Předmět:	Materials science Mechanical Engineering Theory of computing Flow (psychology) Surface roughness Lubrication Geotechnical engineering Fluid mechanics Surfaces and Interfaces Mechanics Homogenization (chemistry) Surfaces Coatings and Films
Zdroj:	Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology. 224:335-351
ISSN:	2041-305X 1350-6501
DOI:	10.1243/13506501jet658
Popis:	A mixed lubrication model that permits real three-dimensional surface topography as input is developed. The theory of computing flow factors within the model is presented, and with a following paper (Part 2) the method of measuring and adapting the surface roughness, and model validation through flow measurements and application to a bearing is shown. A contact mechanics model is used to calculate the elastoplastic displacement of a periodic topography signal. A method based on homogenization is used to calculate flow factors for all lubrication regimes. The flow factors are compared with the Patir and Cheng method. Results indicate that the two methods compare well for longitudinal roughness lay, but differ significantly for a cross-patterned surface roughness due to the more complete flow description of the current model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b7c5f09325f0d4dee67ca3cd50f49171 https://doi.org/10.1243/13506501jet658 Zobrazit plný text záznamu