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Rozprawy doktorskie na temat "Régime élastohydrodynamique"
Molimard, Jérôme. "Etude expérimentale du régime de lubrification en film mince : application aux fluides de laminage". Lyon, INSA, 1999. http://www.theses.fr/1999ISAL0121.
Pełny tekst źródłaIn the cold rolling process, the strip's quality deeply depends on the contact between the strip, the lubricant and the rolls. This quality -requirement leads to favor the mixed lubrication regime. In this case, important interactions between surface asperities are expected. The lubricant and overall the additives have the important task to protect surfaces. This work suggests studying the lubricant behavior when film thickness is very small in order to bring the additives influence to light. A new film thickness measurement method coupling the classical white light interferometry on a point contact to original image analysis software is designed. First tests on a static smooth contact, then on a rough static on~, and last on a dynamic smooth one show the possibility to obtain a precise film thickness map in a range from 1 to 800 nm. At first, this technique is used with laboratory lubricants in elastohydrodyna. Mic lubrication or thin film lubrication. Results are compared to literature, numerical models and another image analysis software. This shows proof of the method's capacity to study thin film regime. In a second time, studies are performed, on two industrial lubricants. The behavior in thin film lubrication is different whether additives are placed or not in the lubricants. If they are some, a low thickness limit appears (2 or 3 nm) and the film thickness can be more important in a low thickness range (typically under 40 nm), preventing surfaces diseases. A model is proposed. It takes into account adsorption and segregation phenomena. Results are consistent to other studies for various lubricants on surface force apparatus or by spectral analysis methods
Makala, Jérôme. "Modélisation d'un variateur toroidal ; études théorique et expérimentale des contacts de traction en régime élastohydrodynamique". Poitiers, 2000. http://www.theses.fr/2000POIT2257.
Pełny tekst źródłaHimmel, David. "Application de la microspectrometrie Raman à la mesure in situ de paramètres physiques régnant dans un contact sphère/Plan en régime de lubrification élastohydrodynamique@". Antilles-Guyane, 2005. http://www.theses.fr/2005AGUY0134.
Pełny tekst źródłaPhysical parameters characterising an elastohydrodynamically lubricated sphère/plane contact are studied by means of in situ Raman microspectrometry using polyphenyl ether (5P4E) as Raman probe and lubricant. Spectroscopic images, also called spectrum images, are acquired point by point in the dynamic contact and are analysed in order to obtain simultaneous high spatial resolution (10µm) mapping of pressure, lubricant film thickness and temperature in the contact and in its vicinity. For pressure, Raman band shifts of the 5P4E band are extracted from spectrum images and are converted into absolute pressure experienced by the lubricant. After a systematic calibration procedure the Raman band intensity of the lubricant film allows us to deduce the distribution of the film thickness. The Antistokes/Stokes intensity ratio is used to determine the temperature values. The experimental distributions of pressure and lubricant film thickness are compared to the theoretical calculations and are in good agreement. The temperature profiles also agree well with the results of previous works
Omar, Farah Samatar. "Modélisation multiphysique des roulements à billes par la Méthode des Éléments Discrets en régime Élasto-Hydro-Dynamique". Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0059.
Pełny tekst źródłaDuring this PhD thesis, we have focused on a digital tool for modeling ball bearing operating under elstohydrodynamic (EHD) regime. Based on an original description involving the discrete element method (DEM), the developed digital tool integrates all the components of ball bearings and enables realistic behavior under mechanical loading and kinematic conditions. Two models of ball bearings were considered and simulated with the digital tool, namely SKF 6208 radial contact ball bearing and SKF 7208 angular contact ball bearing. In order to check the standard indicators recommended by most ball bearing manufactures, a stiffness model for elliptical hertzian contact and an improved EHD formulation for lubricated contact are implemented in the discrete model of ball bearings. In addition, we have introduced into the discrete modeling an electrical capacitance model coupling rheological and dielectric properties of the lubricant with the Hertz's pressure at the contact between the ball and the raceways. The numerical predictions of lubricant film capacitance provided by numerical simulations are in good accordance, both qualitatively and quantitatively, with the experimental data available in the literature. The combination of the discrete modeling and the electrical approach enables efficient solutions to be provided in terms of lubrication regime in relation to the lubricant properties to optimize the bearing lifetime
Ninove, François Pierre. "Texturation de surface par LASER femtoseconde en régime ElastoHydroDynamique et limite : application au contact Segment / Piston / Chemise d'un moteur thermique à combustion". Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00688051.
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