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Tribology Characteristics in 300 μm of Hexagonal Array Dimple Pattern
H. J. Choi,A. S. Hermanto,S. H. Kwon,S. G. Kwon,J. M. Park,J. S. Kim,S. W. Chung,Y. H. Chae,W. S. Choi 한국트라이볼로지학회 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.31 No.6
In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 μm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 μm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 μm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.
Tribology Characteristics in 300 μm of Hexagonal Array Dimple Pattern
Choi, H. J.,Hermanto, A. S.,Kwon, S. H.,Kwon, S. G.,Park, J. M.,Kim, J. S.,Chung, S. W.,Chae, Y. H.,Choi, W. S. Korean Tribology Society 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.4 No.1
In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 µm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 µm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 µm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.
W.S.Choi(최원식),M.J Sin(신미정),S.M Choi(최선미),A.S.Hermanto(앙가세노아지헤르만토),C.J Lee(이창주),M.K Kim(김민규) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
This experiment were carried out to find the characteristic of textured surface bearing disk vary within the holes density and the depth itself. Holes were formed by ultrasonic machine (USM), with a diameter of 0.534 mm and a depth of about 2 – 4 mm and distributed on the contact surface with density between 1.37-2.23%. Nine kinds of textured specimen using typical trends of graph and photograph, which are taken using scanning electron microscope. The effect of holes density and its depth on friction coefficient was reported and discussed.