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Influence of solid body temperature on the thermal EHL behavior in circular contacts / Xiaoling Liu in Transactions of the ASME . Journal of tribology, Vol. 130 N°1 (Janvier 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Titre : Influence of solid body temperature on the thermal EHL behavior in circular contacts Type de document : texte imprimé Auteurs : Xiaoling Liu, Auteur ; Peiran Yang, Auteur Année de publication : 2008 Article en page(s) : 4 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Temperature  Solids Résumé : In order to investigate the influence of the body temperature of contacting solids on the lubrication performance of machine components, such as gears and roller bearings, a full numerical solution for the thermal elastohydrodynamic lubrication (EHL) problem in circular contacts under steady state has been achieved. The analysis assumed that the body temperature is different from the temperature of the supplied lubricating oil. The effects of the body temperature, the slide-roll ratio, and the velocity parameter have been discussed. Results show that if the entrainment velocity is not very high, the solid body temperature plays a dominant role in the EHL behavior; however, the influence of the body temperature decreases as the entrainment velocity increases. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1467990 [article] Influence of solid body temperature on the thermal EHL behavior in circular contacts [texte imprimé] / Xiaoling Liu, Auteur ; Peiran Yang, Auteur . - 2008 . - 4 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Mots-clés : Temperature  Solids Résumé : In order to investigate the influence of the body temperature of contacting solids on the lubrication performance of machine components, such as gears and roller bearings, a full numerical solution for the thermal elastohydrodynamic lubrication (EHL) problem in circular contacts under steady state has been achieved. The analysis assumed that the body temperature is different from the temperature of the supplied lubricating oil. The effects of the body temperature, the slide-roll ratio, and the velocity parameter have been discussed. Results show that if the entrainment velocity is not very high, the solid body temperature plays a dominant role in the EHL behavior; however, the influence of the body temperature decreases as the entrainment velocity increases. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1467990

Influence of two-sided surface waviness on the EHL behavior of rolling/sliding point contacts under thermal and non-Newtonian conditions / Peiran Yang in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 12 p. Titre : Influence of two-sided surface waviness on the EHL behavior of rolling/sliding point contacts under thermal and non-Newtonian conditions Type de document : texte imprimé Auteurs : Peiran Yang, Auteur ; Jinlei Cui, Auteur ; Z. M. Jin, Auteur Article en page(s) : 12 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Pressure  Temperature  Lubricants  Stress  Equations  Film  thickness  Shear  (Mechanics)  Wavelength  Viscosity  Steady  state Résumé : The influence of the transversely and/or longitudinally oriented surface waviness on the lubricating behavior in the rolling/sliding elliptic contact composed of two steel bodies and lubricated with a non-Newtonian lubricant was investigated theoretically with full numerical solution of the thermal elastohydrodynamic lubrication. The entrainment velocity was assumed to be along the minor axis of the Hertzian contact ellipse. The waviness of each surface was given by a sinusoidal function. The non-Newtonian flow of the lubricant was described by the Eyring model with a constant Eyring shear stress at the ambient pressure and temperature. The velocity of the faster surface was assumed to be four times as that of the slower surface in order not only to highlight the thermal and non-Newtonian effects, but also to ensure a cyclic solution when both surfaces were with transversely oriented waviness. Starting from a quasisteady solution, the cyclic time-dependent solution was achieved numerically time step by time step. The results show that the thermal and non-Newtonian effects can be enlarged significantly by the surface waviness, and the worst configuration of the surface topography is that both surfaces are with longitudinal waviness. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468107 [article] Influence of two-sided surface waviness on the EHL behavior of rolling/sliding point contacts under thermal and non-Newtonian conditions [texte imprimé] / Peiran Yang, Auteur ; Jinlei Cui, Auteur ; Z. M. Jin, Auteur . - 12 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 12 p. Mots-clés : Pressure  Temperature  Lubricants  Stress  Equations  Film  thickness  Shear  (Mechanics)  Wavelength  Viscosity  Steady  state Résumé : The influence of the transversely and/or longitudinally oriented surface waviness on the lubricating behavior in the rolling/sliding elliptic contact composed of two steel bodies and lubricated with a non-Newtonian lubricant was investigated theoretically with full numerical solution of the thermal elastohydrodynamic lubrication. The entrainment velocity was assumed to be along the minor axis of the Hertzian contact ellipse. The waviness of each surface was given by a sinusoidal function. The non-Newtonian flow of the lubricant was described by the Eyring model with a constant Eyring shear stress at the ambient pressure and temperature. The velocity of the faster surface was assumed to be four times as that of the slower surface in order not only to highlight the thermal and non-Newtonian effects, but also to ensure a cyclic solution when both surfaces were with transversely oriented waviness. Starting from a quasisteady solution, the cyclic time-dependent solution was achieved numerically time step by time step. The results show that the thermal and non-Newtonian effects can be enlarged significantly by the surface waviness, and the worst configuration of the surface topography is that both surfaces are with longitudinal waviness. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468107