Full Film, Boundary Lubrication and Tribochemistry in Steel Circular Contacts Lubricated with Glycerol |
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Authors: | W Habchi C Matta L Joly-Pottuz M I De Barros J M Martin and P Vergne |
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Affiliation: | (1) Department of Industrial and Mechanical Engineering, Lebanese American University (LAU), Byblos, Lebanon;(2) LTDS UMR5513, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully, France;(3) MATEIS UMR 5510, INSA-Lyon, B?t. Blaise Pascal, 7 Avenue Jean Capelle, 69621 Villeurbanne, France;(4) LaMCoS UMR5259, INSA-Lyon, B?t. Jean d’Alembert, 18-20 rue des Sciences, 69621 Villeurbanne, France; |
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Abstract: | In this article, the lubricating properties of pure glycerol are investigated under both mild and severe EHL regimes. Amazingly
low friction coefficients (about 0.01) are reported by experiments in thick film regimes compared to traditional base oils.
EHL calculations of film thickness and friction (including thermal effects) predict friction coefficients that are twice those
actually found for glycerol. Chemical analysis of glycerol before and after the friction tests were performed by NMR and Karl
Fischer methods, and they reveal that water is produced by tribochemical reaction as well as other species like aldehydes.
This finding is in agreement with a corrosion pattern observed inside the wear scars of the steel samples. This study provides
an explanation to the anomalously low friction observed in the thick film regime. In fact, water produced in the lubricant
decreases traction forces due to the drastic decrease of the viscosity of glycerol with water addition. |
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