薄膜潤滑下におけるポリマー添加油膜のせん断挙

概要

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Oil film thickness of the oils containing non-functionalized polyalkylmethacrylate (PAMA) were determined underpure rolling condition between 0.001m/s and 1m/s and a temperature of 40℃ with a glass disk-on-steel roller tester.The measurements for PAMA solutions with short chain of alkyl group (C1mix) showed a pronounced enhancementof film thickness in the low speeds, while those for long chain (C16mix) fell on the theoretical line. Adsorptiontest indicated the increase in film thickness was due to absorbed layer formed by polymer molecule. Then, tractionbehaviour was studied by varying the rolling speed under a slide/roll ratio of 50% with a sapphire disk-on-steel rollertester. In traction-speed curves, the measurements of all the polymer solutions fell on the base oil line in the highspeeds. At the speed of 0.1m/s, the traction for HMw-C1mix and C16mix solutions deviated downward from the baseoil line, while that for C1mix solution was higher than the other polymer solutions. The traction-film parameter curvessuggested that the traction for C1mix and HMw-C1mix solutions was influenced by the mutual interaction of polymermolecules in the partial EHL region including thin film lubrication, where the concentration of polymer is highcompared to bulk solution.
2010-07-14