関節液潤滑下におけるポリウレタン表層を有する摩擦面の起動摩擦

概要

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The application of a low elastic modulus layer lining on the bearing surface of the joint prosthesis has been investigated to promote continuous film of lubricant between articulating surfaces by soft-elastohydrodynamic effect. However, these elastomeric bearing surfaces generally have poor tribological properties when a fluid film is not present. Thereforc the start-up frictional property is one of the major factors liniting the service life of the advanced prosthesis with compliant layer. The purpose of this research was to elucidate and characterize the start-up friction of segmented polyurethane surface against stainless steel. The smooth surface(Rrms=0.04〜0.05μm)of polyurethane plate gave a start-up friction which was significantly higher than rough one(Rrms=0.53-0.56μm). This seems to be ascribed to the difference in the preservation of lubricant and the adhesive action between two surfaces. The disposition of bearing surfaces, in which the polyurethane plate suffered continuous elastic deformation by counterface, made a start-up friction smaller, because the entraining of lubricant between surfaces was improved. In the condition where the adhesive action affected considerably on a start-up friction, higher hardness of polyurethane and smaller apparent contact area seemed to deduce the start-up friction.
一般社団法人日本機械学会の論文
2000-01-25