The purpose of this paper is to study the influence of friction coefficient of materials with different elastic modulus on the variation of velocity and load under water lubrication and oil lubrication conditions.,Low-viscosity lubricating oil and water were used as lubricants to test the friction performance of the ball-disc contact friction pair in the lubrication state on the universal micro-tribometer multi-functional friction and wear test system.,In the same speed range, the lubrication states from soft to rigid materials are not necessarily similar to each other. Generally, the material with low elastic modulus is suitable in low-viscosity lubricant environments, while the material with high elastic modulus has relatively smaller friction coefficients in oil-lubricated environments compared with water lubrication. However, the coefficients of polyethylene, polytetrafluoroethylen and polyoxymethylene are exceeded by rubber’s coefficients under water lubrication in the same experiment environments, and their lubrication states are not affected by lubricants. The friction coefficient of the friction pair decreases with the increase of loads; however, it does not apply to all materials. The friction coefficients of materials with smaller elastic modulus such as rubber under high loads are rather large. Therefore, the elastic modulus of the material under high loads is a factor to be considered.,The Stribeck curves study of the ball-disk contact friction pair comprising soft and rigid materials, whose elastic modulus is from hundreds of GPa to a few of MPa, was carried out. The influence of different speeds, loads and lubricants on the friction coefficient of the friction pair was revealed, which provided a research basis for the selection and matching of friction pair materials.

中文翻译：

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油水润滑条件下不同弹性模量材料的Stribeck曲线实验研究

本文旨在研究不同弹性模量材料在水润滑和油润滑条件下摩擦系数对速度和载荷变化的影响。万能微型摩擦计多功能摩擦磨损试验系统润滑状态下球盘接触摩擦副的性能.,在相同速度范围内,从软到硬材料的润滑状态不一定相似. 一般来说，低弹性模量的材料适用于低粘度的润滑环境，而高弹性模量的材料在油润滑环境中的摩擦系数与水润滑相比相对较小。然而，聚乙烯、聚四氟乙烯和聚甲醛的系数在相同实验环境下水润滑下的橡胶系数超过了橡胶的系数，并且它们的润滑状态不受润滑剂的影响。摩擦副的摩擦系数随着载荷的增加而减小；然而，它并不适用于所有材料。橡胶等弹性模量较小的材料在高载荷下的摩擦系数较大。因此,材料在高载荷下的弹性模量是一个需要考虑的因素。,由软硬材料组成的球盘接触摩擦副的Stribeck曲线研究,其弹性模量从数百GPa到几MPa ，进行了。不同速度的影响，