Influence Of Thermal Shear Localization On Elastohydrodynamic Contacts
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The temperature in elastohydrodynamic contacts determines the resistance of the lubricant film. Therefore, an efficient assessment of the scuffing risks requires accurate contact temperature prediction. The work presented in this paper makes use of a simple temperature model to investigate the influence of thermal shear localization on the temperature distribution in lubricant films. The model incorporates a multilayer lubricant film representation for the heat equation solution. The paper includes an original heat repartition factor expression and a simple formula for handling intermediate values of the Peclet number. The study also integrates an inlet temperature rise equation. The temperature predictions for sliding/rolling conditions are compared to published numerical results neglecting the shear localization influence. The results agree remarkably well; for the evaluations presenting the higher absolute difference, the correspondence remained over 94% and 95% for the maximum and mean temperatures, respectively. For the tested conditions, subsequent inclusion of the thermal shear localization contribution reveals that the shear localization augments the mean film temperature, while, depending on the pressure, the shearing zone occupies between 50 to 70% of the film thickness. Keywords: elastohydrodynamic, temperature, inlet temperature, heat repartition.
elastohydrodynamic, temperature, inlet temperature, heat repartition