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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 22, Issue 6 - Dec 2006
Volume 22, Issue 5 - Oct 2006
Volume 22, Issue 4 - Aug 2006
Volume 22, Issue 3 - Jun 2006
Volume 22, Issue 2 - Apr 2006
Volume 22, Issue 1 - Feb 2006
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Sliding Wear and Friction Properties of Composite Materials for Friction Bushing
Lee Han-Young ; Heo Dae-Hong ; Kim Tae-Jun ; Cho Yong-Jae ; Cho Bum-Rae ; Hur Man-Dae ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 1~7
The sliding friction and wear properties of mineral fiber reinforced composite(MF) and glass fiber reinforced composites(GF) are investigated to clarify their field of use and the role of each fiber in friction material. Friction and wear test reveals that GF composite has better wear resistance even though with low friction coefficient, comparing with MF composite. Glass fiber strengthen effectively the matrix and may absorb friction energy to convert it into the fracture energy of them, as well as its lubricative role. However, mineral fiber in MF composite is too small to strengthen the matrix. Then MF composite are easily plowed and worn out by asperity on counter material. Friction coefficient of MF composite is higher friction coefficient than that of GF composite and varied widely with test.
The Relationship between a Wear Depth :and a Decrease of the Contacting Force in the Nuclear Fuel Fretting
Lee Young-Ho ; Kim Hyung-Kyu ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 8~13
Sliding wear tests have been performed to evaluate the effect of normal load decrease on the wear depth of nuclear fuel rods in room temperature air. The objectives of this study are to quantitatively evaluate the supporting ability of spacer grid springs, to estimate the wear depth by using the contacting force decrease and to compare the wear behavior with increasing test cycles (up to
) at each spring condition. The result showed that the contacting load decrease depends on the spring shape and the applied slip amplitude. The estimated wear depth is smaller when compared with measured wear depth. Based on the test results, the wear mechanism, the role of wear debris layer and the spring shape effect were discussed.
Evaluation of Engine Lubrication System for Adapting Variable Cam Timing System
Yun Jeong-Eui ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 14~19
VCT(Variable Cam Timing) system is one of very useful engine components to improve fuel economy and overcome emission regulation etc. In order to adapt the VCT to a base engine, many design mod ifications in the mechanical and lubrication fields are required. Especially, because the VCT performance itself depends on supplied oil flow rate and pressure, it is very important to evaluate the engine lubrication system in a viewpoint of supplied oil flow rate and pressure. In this paper, unsteady transient flow network analysis on the engine oil circuit system was carried out to do this.
Stress Behavior Analysis of O-rings and Packing for a LPG Filling Nozzle
Kim, Chung-Kyun ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 20~25
The stress behavior analysis of a-rings and packing for a LPG filling unit has been presented using a finite element analysis technique by non-linear MSC/MARC program. The sealing performance and endurance of a-rings and packing are affected by working conditions such as filling pressure, friction coefficient, compression ratio, and material properties. The elastomeric polymers of O-rings and packing are nitrile butadiene rubber (NBR) and polytetrafluoroethylene (PTFE), which are selected as proper materials of a-rings and packing based on the stress analysis results. The calculated FEM results showed that the proper material of O-ring is NBR as a secondary sealing component and the recommended material of packing is PTFE as a primary sealing unit during a LPG filling process.
A Study on Clearance Behaviors with Micro Scaled Lubricant Aeration under the Dynamically-Loaded Condition
Jang, Si-Youl ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 26~32
This work analyzes the behaviors of aerated lubricant in the gap between con-rod bearing and journal. Aerated lubricant influences two major factors on the film formation. One is the density characteristics of the lubricant due to the volume change by the bubbles and the other is the viscosity characteristics of the lubricant due to the surface tension of the bubble. Those two major factors surprisingly increase the load capacity in certain ranges of bubble sizes and densities. Modified Reynolds' equation is developed with the consideration of aerated ratio in the lubricant and journal locus is computed with the Mobility method after the computation of two dimensional pressure distributions over the bearing area.
Flange Wear of the High Speed Train
Lee Hisung ; Kang Bu-Byoung ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 33~39
During the high speed train operation in the conventional line, it was found to have extremely severe flange wear, due to the curvy routes. This paper looks at the actions that have been taken to bring the wear to an acceptable level. In particular, it have been presented for flange wear variation depending on curve radius, cant, transition curve length by using numerical method. And the impacts on the flange wear by the application of stick type solid lubricant are also presented.
Analysis of Air Foil Bearing using Influence Coefficients of a Bump Foil
Kim Young-Cheol ; Lee Dong-Hyun ; Kim Kyung-Woong ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 40~46
This paper presents the influence coefficient method to predict the deflection of bump foil precisely in the sub-structure of AFB(air foil bearing). Heshmat has introduced the simple compliance model to calculate the deflection of bump foil. But this approach can not consider the deflection of bump foil at the edge of AFB, so elasto-hydrodynamic model is insufficient to analyze in case that the eccentricity ratio is greater than 1. Peng has used the average pressure and film thickness, but this approach is not also a realistic model. Influence coefficients of a bump is calculated by finite element method, and introduced in bump deflection equations of the performance analysis of air foil bearing. The effects of the influence coefficient on the bearing performance is discussed in detail for appropriate foil design.
Oil Flow Distribution Control of Engine Lubrication System Using Orifice Component
Yun Jeong-Eui ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 22, issue 1, 2006, Pages 47~52
It is very important to control pressure and flow rate distribution on each component of engine lubrication network. Sometimes many kinds of orifice are used to control flow rate in the hydraulic lubrication field. In this study orifices were adopted on the lubrication network to control oil flow rate distribution. And unsteady transient flow network analysis was carried out to find out the effects of orifices on the engine oil circuit system.