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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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Analysis of Sliding Friction and Wear Properties of Clutch Facing for Automobile (Part 1)
Lee Han-Young ; Kim Geon-Young ; Hur Man-Dae ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 299~305
The wear properties of clutch facing materials with two different copper amounts were evaluated against the fly-wheel materials used in clutch system, such as gray cast iron and spheroidal graphite cast iron. Sliding wear tests were carried out for four different combinations with these clutch facing materials and flywheel materials at different speeds and applied loads. Results showed that the clutch facing material contained a higher copper amount had the better wear resistance. And using the gray cast iron as the counter material, clutch facing material resulted in the much lower wear rate, regardless of the copper amount. It is obvious that the wear properties of clutch facing material are influenced from the thermal conductivities of the clutch facing material and the counter material.
Influence of Coating Defect Ratio on Tribological Behavior Determined by Electrochemical Techniques
Lee Young-Ze ; Kim Woo-Jung ; Ahn Seung-Ho ; Kim Ho-Gun ; Kim Jung-Gu ; Cho Chung-Woo ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 306~313
Many of the current development in surface modification engineering are focused on multilayered coatings, which have the potential to improve the tribological properties. Four different multilayered coatings were deposited on AISI D2 steel in this study. The prepared samples are designed as
. The multilayered coatings were investigated with respect to coating surface and cross-sectional morphology, roughness, adhesion, hardness, porosity and tribological behaviors. Especially, wear tests of four multilayered coatings were performed by using a ball-on-disc configuration with a linear sliding speed of 0.017 m/sec and a normal load of 5.38 N load. The tests were carried out at room temperature in air by employing AISI 52100 steel ball
having a diameter of 10 mm. The surface morphology, and topography of the wear scars of samples and balls have been determined by using scanning electron spectroscopy (SEM). Also, wear mechanism was determined by using SEM coupled with energy-dispersive spectroscopy (EDS). Results have showed an improved wear resistance of the
coatings with increasing of Al (aluminum) concentration.
Numerical Study of Behaviour Characteristics of Mechanical Seals with Inclined Friction Faces
Kim Chung Kyun ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 314~321
Thermal distortion of non-contacting mechanical seals with inclined rubbing surfaces is affected by friction heat between seal ring and seal seat. The circulation fluid along the inclined rubbing surfaces maintains cooling friction heat and lubrication between the sealing surfaces of mechanical seal with an inclined surface. Mechanical seals with inclined sealing surfaces may be useful for reducing the frictional heating and power loss because of the introduction of cooling fluids to the sealing gap between seal ring and seal seat. From the FEM computed result shows that the thermal behavior and von Mises stress of sealing faces with an inclined angle 60 are much reduced in comparison of the conventional mechanical face seal with rectangular sealing surfaces.
Dynamics of a Pico Slider during the Ramp Loading Process
Rhim Yoon-Chul ; Kim Bum-Joon ; Cho Kwang-Pyo ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 322~329
Recently, a load/unload(L/UL) system is adopted to the hard disk drive(HDD) due to its advantages such as lower power consumption, larger data zone, simpler fabrication of disk due to no bumped parking zone, and rarer contact between slider and media. An analysis of the transient motion for the slider is very important to design an air bearing surface(ABS) of the slider to secure the stable performance of the system. During the L/UL process, however, there are several issues occurred such as contact or collision between slider and media. Sometimes this will cause the system failure. In this study, the dynamics of a pico slider during the loading process are investigated through numerical simulation using FEM analysis and experiment. Ramp profile and angular velocity of the swing arm actuator are very important parameters for the design of L/UL system to avoid collision between slider and disk.
Effects of Pad Number on the Static Performances of Large Tilting Pad Journal Bearings
Kim Sung-Gi ; Kang Ji-Hoon ; Kim Kyung-Woong ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 330~336
In this paper, thermohydrodynamic characteristics of large tilting pad journal bearings which have
tilting pads were numerically analyzed. The turbulent lubrication equation and the energy equation were solved. The regime of operation of this bearing is laminar, turbulent and transitional. Also viscosity of working fluid was considered as function of only temperature and inlet pressure build-up was considered. Numerical results for a large tilting pad journal bearing showed pressure distribution, temperature distribution, eccentricity ratio, and friction torque. The effects of pad number on the static performances of a large tilting pad journal bearing are discussed.
Friction and Wear of the Vane/Roller Surfaces Depending on Several Sliding Condition for Rotary Compressor
Oh Se-Doo ; Cho Sung-Oug ; Lee Young-Ze ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 337~342
One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surfaces. In this study, the tribological characteristics of sliding surfaces using vane-roller geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the test, friction force, wear depth, time to failure and surface temperature were monitored. Because severe wear occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear life of vane-roller interfaces. From the sliding test it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on the load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in the amounts of friction and wear between roller and vane surfaces.
An Experimental Study for the Minimization of Soot Adsorption on the Optical Surface of an Engine Soot Detector (I)
Yoon Eui-Sung ; Kim Hak-Yal ; Kong Hosung ; Han Hung-Gu ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 20, issue 6, 2004, Pages 343~349
The adsorption of soot particles onto a sensor surface of the engine soot detector posses a critical problem in the measurement. In order to prevent the optical rod surface from soot contamination, various functional coatings and flow-induced cleaning were applied to the surface in this work. For surface coatings, various materials of self-assembled monolayers (SAM) such as OTS (octadecyltrichlorosilane), PFDTES (perfluorodecyl-triethoxysilane) and PFDTMS (perfluorodecyltrimethoxysilane) were coated on the optical rod surface ,which have different characteristics in both hydrophobicity and oleophobicity. These coatings were tested with soot content varying from
and oil temperature from 20 to
. Test results showed that surface coatings were not effective for preventing the adsorption of soot panicles on the surface of optical rod. It was thought that these coatings provided the surface with additional attractive surface forces. However, it was found that adsorption of soot particles onto a sensor surface was minimized by flow-induced cleaning. This effect was tested with varying the flow velocity.