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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 21, Issue 6 - Dec 2005
Volume 21, Issue 5 - Oct 2005
Volume 21, Issue 4 - Aug 2005
Volume 21, Issue 3 - Jun 2005
Volume 21, Issue 2 - Apr 2005
Volume 21, Issue 1 - Feb 2005
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Finite Element Analysis for the Contact Behavior in Double-Type Mechanical Face Seals Used for Small Hydro Power Turbine
Kim, Chung-Kyun ; Kang, Hyun-Joon ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 21, issue 5, 2005, Pages 201~208
This paper presents the FEM analysis on the contact behavior characteristics of mechanical face seals in a small hydro-power turbine. Especially, the axial displacement and contact normal stress between a seal ring and a seal seat of a primary sealing unit have been analyzed as functions of rotating speed of a hydro-turbine, sealing gap, water and cooling fluid temperature. Those are strongly related to a leakage of water and wear between a seal ring and a seal seat. The FEM computed results present that the rotating speed of a hydro-turbine may be kept less than 800 rpm, and the sealing gap in a primary sealing unit is restricted
. The coolant temperature in which is most influential parameter to the contact behaviors of a sealing unit may be kept less than
for a safe operation of a sealing unit without a leakage and wear.
Nano/Micro Friction with the Contact Area
Yoon Eui-Sung ; Singh R. Arvind ; Kong Hosung ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 21, issue 5, 2005, Pages 209~215
Nano/micro friction with the contact area was studied on Si-wafer (100) and diamond-like carbon (DLC) film. Borosilicate balls of radii
mounted on the top of AFM tip (NPS) were used for nano-scale contact and Soda Lime glass balls of radii 0.25mm, 0.5mm, 1mm were used for micro-scale contact. At nano-scale, the friction between ball and surface was measured with the applied normal load using an atomic force microscope (AFM), and at micro scale it was measured using ball-on flat type micro-tribotester. All the experiments were conducted at controlled conditions of temperature
. Friction was measured as a function of applied normal load in the range of 0-160nN at nano scale and in the range of
at micro scale. Results showed that the friction at nano scale increased with the applied normal load and ball size for both kinds of samples. Similar behavior of friction with the applied normal load and ball size was observed for Si-wafer at micro scale. However, for DLC friction decreased with the ball size. This difference of in behavior of friction in DLC nano- and microscale was attribute to the difference in the operating mechanisms. The evidence of the operating mechanisms at micro-scale were observed using scanning electron microscope (SEM). At micro-scale, solid-solid adhesion was dominant in Silicon-wafer, while plowing in DLC. Contrary to the nano scale that shows almost a wear-less situation, wear was prominent at micro-scale. At nano- and micro-scale, effect of contact area on the friction was discussed with the different applied normal load and ball size.
Ceramic-Ceramic Wear of Zirconia/Alumina Composites for the Application of Total Hip Replacement
Lee Kwon-Yong ; Kim Hwan ; Kim Dae-Jun ; Lee Myong-Hyon ; Seo Won-Seon ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 21, issue 5, 2005, Pages 216~220
The sliding wear behaviors of three different compositions of novel low temperature degradation-free zirconia/alumina (LTD-free Z/A) composites were examined in a ceramic-ceramic contact pair. The wear tests were performed by using a pin-on-disk type wear tester in a linear reciprocal sliding motion with a line contact in both dry and bovine serum lubricated conditions at room temperature. From the results of dry sliding wear tests, Z/A#1((5.3Y, 4.6Nb)-TZP/80
) showed the best wear resistance among three kinds of LTD-free Z/A composites. For the bovine serum lubricated sliding wear tests, wear was too little to be measured for all kinds of Z/A composites. These novel LTD-free Z/A composites having excellent wear resistance demonstrated a potential as the alternative materials for the ceramic-ceramic contact pairs of femoral head and acetabular liner in total hip replacement.
A New Method for Lateral Force Calibration in Atomic Force Microscope
Yoon Eui-Sung ; Kim Hong Joon ; Wang Fei ; Kong Hosung ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 21, issue 5, 2005, Pages 221~226
A new calibration method for exact measurement of friction force in atomic force microscope (AFM) is presented. A new conversion factor involves a contact factor affected by tip, cantilever and contact stiffness. Especially the effect of contact stiffness on the conversion factor between lateral force and lateral signal is considered. Conventional conversion factor and a new modified conversion factor were experimentally compared. Results showed that a new calibration method could minimize the effect of normal load on friction force and improve the conventional method. A new method could be applied to the specimens with different physical properties.
Tribological Failure Analysis of Automatic Transmission in a Passenger Car
Kim, Chung-Kyun ; Lee, Il-Kwon ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 21, issue 5, 2005, Pages 227~235
This paper presents a tribological study on the failure cases of automatic transmission components in a passenger car. The automatic transmission system is composed of torque converter, clutch, brake, planetary gear, and valve body controlling oil pressure of an automatic transmission fluid. The most largest influence components in an automatic transmission are a torque converter and clutch plate in which are influenced by a wear and torque converting energy loss. The failure case study of an automatic transmission indicates that the tribological design and maintenance technologies should be considered as a key design concept. This means that the failure and power energy loss come from the friction, wear and a oil leakage of an automatic transmission, which is related to the oil seal and O-ring seal failures.
Adhesion Strength Measurement of Rabbit Knee Chondrocyte
Lee Kwon-Yong ; Park Sang-Guk ; Shin Daehwan ; Park Jong-Chul ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 21, issue 5, 2005, Pages 236~240
In order to prepare for the suitable surfaces of implants or medical devices, quantitative evaluation of adhesion between cells and biomaterials is essential. To better understand adhesion formation between cells and biomaterials, we used the cytodetachment technique which measures the adhesive force of a single cell through changing the, culture time and detachment speed. The results showed that the adhesive force could be affected by the culture time of cells on the surface of materials and the detachment speed. Moreover, there was a large discrepancy among the adhesion strength measured by similar techniques conducted on the different cells and substrates. It can be 'concluded that the variation of the force measurement technique can seriously alter the level of the force required to detach a cell on the surface of materials.