Funct. Mater. 2026; 32 (1): 54-60.
Influence of parameters of discretely textured oil-retaining contact surfaces on the fretting resistance of tribosystems
1 State University "Kyiv Aviation Institute", 1 Liubomyra Guzara ave, 03058, Kyiv, Ukraine
2National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37, Prospect Beresteiskyi, 03056, Kyiv, Ukraine
3Khmelnytskyi National University, 11, Instytuts′ka str., 29016, Khmelnytskyi, Ukraine
The study investigates the efficiency of improving the fretting resistance of tribosystems by forming oil-retaining discretely textured surfaces (DTS) with regularly arranged microdimples. Phenomenologically, such surfaces were considered as having a discrete texture, and the microdimples acted as reservoirs providing continuous regeneration of boundary lubricant layers in the frictional contact zone. The DTSs in the form of a system of prismatic and spherical microdimples with specified texture parameters were created on the working surfaces of samples using an impact–plastic deformation method. Friction pairs with different hardness of contacting materials were studied. Pairs with DTS formed on samples with hardness higher than that of their counterbodies were usually called direct pairs. In contrast, pairs with lower DTS hardness compared to the counterbody were called inverse pairs. It has been established that under fretting conditions with lubricated polished surfaces, lubrication does not provide a significant increase in the fretting resistance of the studied materials, both in direct and inverse pairs; this indicates insufficient stability of boundary lubricant layers on such surfaces. Under identical fretting wear and lubrication conditions, friction pairs with DTS demonstrated significantly increased resistance to fretting-corrosive wear. The most pronounced improvement in wear resistance was achieved in direct pairs with spherical dimple profiles. Compared to the baseline version, the wear of samples with pairs of spherical dimples was more than six times lower. At the same time, the wear of counterbodies and the total wear of the pair also decreased significantly. It was shown that for given DTS formation parameters and fretting conditions, the spherical profile ensured the higher lubrication efficiency of microdimples compared to the prismatic profile. Based on the experimental results, statistical analysis was performed, and regression models were developed to describe the dependence of wear on the technological parameters of surface texturing and fretting conditions.
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