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Étude par la méthode d’homogénéisation des effets combinés de la rugosité de surface et de la rhéologie du lubrifiant sur le comportement d’un contact hydrodynamique

Published online by Cambridge University Press:  24 December 2010

Ahcene Mouassa ,
Mustapha Lahmar  and
Benyebka Bou-Said
Ahcene Mouassa
Affiliation:
Laboratoire de Mécanique et Structures (LMS), Université de Guelma, BP 401, Ouelma 2400, Algérie
Mustapha Lahmar
Affiliation:
Laboratoire de Mécanique et Structures (LMS), Université de Guelma, BP 401, Ouelma 2400, Algérie
Benyebka Bou-Said*
Affiliation:
Université de Lyon, CNRS INSA-Lyon, LaMCoS, UMR 5259, 69621 Villeurbanne, France
*
a Auteur pour correspondance : benyebka.bou-said@insa-lyon.fr
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Abstract

Dans cet article, les effets combinés de la rugosité de surface et de la rhéologie du lubrifiant additivé sur les performances hydrodynamiques d’un patin plan incliné sont étudiés au moyen de la méthode d’homogénéisation. La surface du patin contiguë au film est supposée fixe et rugueuse tandis que la surface inférieure mobile est parfaitement lisse. Le modèle de fluide polaire ou à couple de contrainte de V.K. Stokes est adopté pour décrire le comportement rhéologique du lubrifiant s’écoulant entre les deux surfaces. Les études de simulation sont effectuées en considérant trois formes de rugosités (transversales, longitudinales et anisotropes) et différentes valeurs du paramètre de couple de contrainte. La comparaison des solutions obtenues par les méthodes déterministe et d’homogénéisation a permis de conclure que la méthode d’homogénéisation est efficace pour les trois formes de rugosité envisagées. Les résultats de l’étude paramétrique effectuée montrent que les rugosités de surface et les couples de contraintes dus à la présence des additifs polymériques dans le lubrifiant ont des effets non négligeables sur les performances hydrodynamiques du contact, à savoir : le champ de pression, la capacité de charge, le nombre de frottement et la puissance dissipée.

Keywords

Lubrification hydrodynamiquerugosité de surfacepatin inclinéfluide polaireméthode d’homogénéisationméthode déterministeHydrodynamic lubricationsurface roughnessslider bearingpolar fluidhomogenization methoddeterministic method
Type
Research Article
Information
Mechanics & Industry , Volume 11 , Issue 5 , September 2010 , pp. 345 - 363
Copyright
© AFM, EDP Sciences 2010

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