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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Tribologists and Lubrication Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Tribologists and Lubrication Engineers
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Volume & Issues
Volume 20, Issue 6 - Dec 2004
Volume 20, Issue 5 - Oct 2004
Volume 20, Issue 4 - Aug 2004
Volume 20, Issue 3 - Jun 2004
Volume 20, Issue 2 - Apr 2004
Volume 20, Issue 1 - Feb 2004
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Micro/Nano Adhesion and Friction Properties of Mixed Self-assembled Monolayer
Yoon Eui-Sung ; Oh Hyun-Jin ; Han Hung-Gu ; Kong Hosung ; Jhang Kyung Young ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 51~57
Micro/nano adhesion and friction properties of mixed self-assembled monolayer (SAM) with different chain length for MEMS application were experimentally studied. Many kinds of SAM having different spacer chains(C6, C10 and C18) and their mixtures (1:1) were deposited onto Si-wafer, where the deposited SAM resulted in the hydrophobic nature. The adhesion and friction properties between tip and SAM surfaces under nano scale applied load were measured using an atomic force microscope (AFM) and under micro scale applied load were measured using ball-on-flat type micro-tribotester. Surface roughness and water contact angles were measured with SPM (scanning probe microscope) and contact anglemeter. Results showed that water contact angles of mixed SAMs were similar to those of pure SAMs. The morphology of coating surface was roughened as mixing of SAM. Nano adhesion and nano friction decreased as increasing of the spacer chain length and mixing of SAM. Micro friction was decreased as increasing of the spacer chain length, but micro friction of mixed SAM showed the value between pure SAMs. Nano adhesion and friction mechanism of mixed SAM was proposed in a view of stiffness of spacer chain modified chemically and topographically.
Lubrication Performance Analyses of Spiral Groove Dry Gas Seals - Part I: EE Analysis and Basic Performance Evaluation
Lee An Sung ; Yang Jae-Hun ; Choi Dong-Hoon ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 58~67
In this study a general Galerkin FE lubrication analysis method for the compressible Reynolds equation in cylindrical coordinates is presented. Then, the method is applied for analyzing lubrication performances of spiral groove dry gas seals. The effects of toning and number of groove on performance indices are evaluated at low and high rotating speeds: 3,600 and 15,000 rpm. Results show that, for the primary design consideration performances such as the opening force and axial and angular stiffnesses, a negative or small coning and a large number of groove are preferred.
Lubrication Performance Analyses of Spiral Groove Dry Gas Seals - Part II: Detailed Performance Evaluation of Groove Design Parameters
Lee An Sung ; Yang Jae-Hun ; Choi Dong-Hoon ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 68~76
Applying a general Galerkin FE lubrication analysis method to spiral groove dry gas seals, this study intends to analyze in detail the effects of groove design parameters, such as a spiral angle, groove width ratio, groove radius ratio, groove depth ratio, and groove taper ratio, on the lubrication performances of an opening force, leakage, axial stiffness and damping, and angular stiffness and damping at low and high rotating speeds: 3,600 and 15,000 nm. Results show that, for the primary design consideration performances such as the opening force and axial and angular stiffnesses, a spiral angle of
, a groove width ratio of 0.46, a groove radius ratio of 1.1, a groove depth ratio of 1.0, and a groove taper ratio of 0.0 are preferred. Where the recommended relatively low values of groove depth and taper ratios are to keep the axial and angular dampings positive or higher than 0 particularly at the high rotating speed.
Sound Field Analysis of Cylindrical Roller Bearings Under Radial Load
Rho Byoung-Hoo ; Kim Dae-Gon ; Kim Kyung-Woong ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 77~83
The purpose of the paper is to numerically investigate the acoustic noise characteristics of cylindrical roller bearings under radial load. For the sake of simplifying of the analysis, it was assumed that the cylindrical roller bearings are infinitely long. Furthermore, the effects of following on the noise of the bearing were also examined: the radial clearance of the bearing, the viscosity of the lubricant, and the number of the rollers. The results and discussions of the present paper could aid in the design of low-noise cylindrical roller bearings.
Crankshaft Bearing Design Adapting Continuous Oil Supply System
Yun Jeong-Eui ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 84~90
It is very important to improve the durability and reliability of crankshaft because of conflicting demands for lower fuel consumption and higher power output. In this study, for the crankshaft bearing design, analyses were conducted to determine the lubrication characteristics such as oil flow rate, minimum oil film thickness, friction force and increase of oil temperature at main bearing and connecting rod bearing. Additionally, supplied oil pressure and temperature effects on the bearings were simulated to figure out lubrication characteristics on the bearings. Finally the effects of increasing the bearing width and clearance were introduced on the lubrication characteristics.
Wear Behavior of SUS304 Stainless Steels in Corrosive Environment
Lee Kwang-Jin ; Yoon Sang-Don ; Koo Young-Pil ; Kim Hyung-Ja ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 91~96
Wear behavior of self-mated stainless steels in NaCl solution has been investigated. The experiment was done in the corrosive liquid of which NaCl concentration of
and temperature of
. Two kinds of wear type were observed: one is 'severe wear' type which shows gradually increasing wear volume with increasing sliding distances, the other is 'mild wear' type which shows change of wear rate from high value to low at transition distance. The specific wear rate in severe wear type was not sensitive to the liquid temperature and concentration of NaCl but stable at value of
The Study on the Wear-Corrosion Behavior of Al-Mg Alloy in the Coast
Park Hee-Ok ; Lim Uh-Joh ; Park Dong-Gi ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 97~101
This paper reports the studies on the wear-corrosion behavior of Al-Mg alloy in various pH environments. In various pH of sea water, corrosion and wear-corrosion loss of Al-Mg alloy were investigated. Also, the polarization test of Al-Mg alloy using potentiostat/galvanostat was carried out. And the rubbed surface of Al-Mg alloy using scanning electron micrographs after wear-corrosion test was examined in various pH values of sea water. The main results are as following : The polarization resistance of Al-Mg alloy in pH 4 solution is higer than that in pH 6.7 solution, and the corrosion current density in pH 4 is controlled than in pH 6.7 solution. The wear-corrosion loss of Al-Mg alloy with lowering pH becomes sensitive. As the oxide product of Al-Mg alloy appears granular structure and exholiation phenomenon, wear-corrosion loss of Al-Mg alloy increases.
Molecular Dynamics Simulation of Friction and Wear Behavior Between Carbon and Copper
Kim Kwang-Seop ; Kang Ji-Hoon ; Kim Kyung-Woong ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 2, 2004, Pages 102~108
In this paper, friction and wear behaviors between monocrystalline, defect-free copper and carbon on the atomic scale are investigated by using 2-dimensional molecular dynamics simulation. It is assumed that all interatomic forces are given by Morse potential. The deformation of carbon is assumed to be neglected and vacuum condition is also assumed. Average friction and normal forces for various surface conditions, various scratch speeds and scratch depths are obtained from simulations. Changes of wear behaviors for various scratch speeds and surface conditions are investigated by observing snapshots in scratch process. The effects of surface conditions, scratch speeds, and scratch depths on the friction force, normal force, and friction coefficient are also investigated.