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Influence of thermal conductivity of contact bodies on perturbed film caused by a ridge and groove in point EHL contacts.pdf

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Influence of thermal conductivity of contact bodies on perturbed film caused by a ridge and groove in point EHL contacts.pdf

Tribology International 100 (2016) 84–98 Contents lists available at ScienceDirect Tribology International journal homepage: /locate/triboint In?uence of thermal conductivity of contact bodies on perturbed ?lm caused by a ridge and groove in point EHL contacts Motohiro Kaneta a,n, Jinlei Cui b, Peiran Yang b, Ivan Krupka a, Martin Hartl a a Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic b School of Mechanical Engineering, Qingdao Technological University, Qingdao, PR China article info Article history: Received 8 June 2015 Received in revised form 9 October 2015 Accepted 13 November 2015 Available online 22 November 2015 Keywords: Thermal elastohydrodynamic lubrication Ceramic-steel contacts Thermal viscosity wedge effect Perturbed ?lm abstract The effects of a transverse ridge and groove in ceramics (Si3N4 and ZrO2) and steel circular contacts on the ?lm thickness, pressure and temperature are discussed through transient non-Newtonian thermal EHL analyzes. The appearance time and the moving velocity of a perturbed ?lm generated by a surface irregularity are mainly affected by the sign of slid-roll ratio, which relates directly to the thermal viscosity wedge effect, and the surface where the irregularity exists. The moving velocity of the perturbed ?lm does not necessarily corresponds to the entrainment velocity. The perturbed ?lm produced by the groove brings about a higher pressure at the ridge position depending on the relative position between the groove and the ridge. 2015 Elsevier Ltd. All rights reserved. 1. Introduction The elastohydrodynamic lubrication (EHL) theory [1–5] has contributed very much to improve the working performance, reliability and durability of numerous machine elements having a concentrated contact between nonconforming surfaces. This is because the EHL theory can predict the ?lm thickness and pressure distributions fairly accurately by knowing the mechanical and thermal conditions at the entrance