椭圆柱形织构几何参数和排布模式对其润滑减摩性能的影响

利用数值模拟方法研究了具有各向异性结构特征的椭圆柱形织构在全膜润滑条件下的摩擦学性能,详细分析了椭圆织构的长轴尺寸、椭圆率、倾角和位置偏移率等参数对摩擦系数和动压承载能力的影响,并对三种不同的椭圆织构排布模式进行了对比研究.结果发现:适当的增加椭圆织构单元的面积率和倾角能有效降低表面间的摩擦系数,而随着织构单元的位置偏移率的增加,摩擦系数有小幅上升,但是增加位置偏移率却能显著提升表面间的动压承载能力.织构单元的排布模式对摩擦系数的影响很小,但是对动压承载能力却有较大影响.对椭圆织构单元的几何参数及排布模式进行优化设计是提升表面间的动压承载能力的一种有效手段.

Effect of Geometry Parameters and Patterns on Tribological Properties of Textured Surface with Elliptical Dimples

The simulation model of textured surface with elliptical dimples was performed in this paper, and tribological properties of parallel reciprocating sliding surfaces under hydrodynamic lubrication conditions were studied in detail. The effects of semi-major axis, ellipticity, inclination angle and offset ratio on coefficient of friction and load-carrying capacity were analyzed, and then the results of three different patterns were compared. The results show that the coefficient of friction reduced as the area ratio and inclination angle increased, but slightly increased with the offset ratio. The load carrying capacity increased significantly with inclination angle and offset ratio. The patterns of elliptical dimples had a limited influence on the coefficient of friction, but a pronounced effect on load-carrying capacity. It is concluded that optimizing geometrical parameters and patterns of elliptical dimples were effective to improve the loadcarrying capacity of textured surfaces.