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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 16, Issue 6 - Dec 2000
Volume 16, Issue 5 - Oct 2000
Volume 16, Issue 4 - Aug 2000
Volume 16, Issue 3 - Jun 2000
Volume 16, Issue 2 - Apr 2000
Volume 16, Issue 1 - Feb 2000
Selecting the target year
Correlation of oxidation, Crosslinking, and Wear of UHMWPE
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 241~246
The effect of post-irradiation shelf-aging time on the wear of UHMWPE was investigated, and wear results were correlated with the time-dependent microstructural changes of polyethylene after gamma irradiation sterilization. The levels of oxidation and crosslinking in the shelf-aged acetabular liners were examined by FTIR and hot xylene extraction, respectively, and uni-directional repeat pass sliding wear tests were conducted by using a pin-on-disc wear tester. Gamma irradiation sterilization in the air environment caused an increase of oxidation, crosslinking, and wear resistance. With aging, however, oxidation progressed and decreased the level of crosslinking. This resulted in a decrease of wear resistance of UHMWPE that was accompanied with white bands and brittle cracking.
A Robust Design Study of Air Bearing Slider for HDD
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 247~252
As the demand for higher areal recording densities requires a lower flying height of the slider, the variation of the flying height of the slider during drive operation becomes of great concern. The variation of the flying height is closely related with the slider design parameters such as air bearing shape, cavity depth, shallow step depth, crown, camber, pitch offset, roll offset, gram load, and so on. The objective of this work is to optimize the cavity depth and the shallow step depth, which are the control factors in air bearing design, using Robust Design method. It was found that the shallow step depth was statistically significant in affecting the variation of flying height, therefore the level of the shallow step depth should be chosen to minimize the variation of flying height.
Frictional Characteristics of Wire Electric Discharge Machined STDll Surface
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 253~258
Frictional behavior of wire electric discharge machined surfaces of spheroidized annealed STDll steel was investigated. The surfaces were produced with a various series of finish cuts where pulse energy was reduced with increase in the number of finish cuts. Roughness and micro-hardness of the surfaces were also measured. It is observed that the increase in the number of finish cuts produces the surface exhibiting lower frictional resistance followed by higher resistance after considerable wear. Effects of finish cuts on the friction characteristics are discussed with the aid of roughness and micro-hardness of the surfaces.
A Characteristic Study of Efficiency in Radial Piston Pump
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 259~265
Pump which is the fundamental device in the hydraulic system affects on overall system performance to a great deal. Such problems as leakage and solid friction loss become important in field applications, especially for the case of operation under high pressure and at high speed. So the research on this kind of subjects is necessary to improve the performance of hydraulic devices. A high pressure radial piston pump is analyzed here, which has a stationary cylinder block. It pumps hydraulic fluid by letting camring push a piston in a cylinder. Fluid leaks between the piston and cylinder so that it deteriorates the pump efficiency. Furthermore, the piston happens to touch the cylinder wall to increase the friction loss and wear. In this research, by means of FDA, volumetric, mechanical and overall efficiencies are observed by varying several design parameters and operation conditions. Design values or their trends are presented to improve these effciencies.
Friction and Wear Characteristics of Friction Material with the Content of Hexamethylenetetramine
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 266~273
The friction characteristics of phenolic resin and model friction materials were investigated with the content of hexamethylenetetamine (HEXA). At 10 wt.% of HEXA, the phenolic resin and model friction materials showed the most stable friction coeffcient in constant temperature test at various test conditions because of its good thermal stability and proper curing reaction. It was found from constant interval test in mild condition that the friction coeffcients of friction materials cured with 10 wt.% of HEXA was the highest and stable values in the whole range of braking operations. However, at the severe condition in constant interval test, the friction coefficient of friction materials cured with 10 wt.% to of HEXA was lowered and as the number of braking operation increased, the values became stable. In order to obtain the thormal stable friction materials, the content of HEXA from 5 to 10 wt.% could be recommended.
Dynamic Characteristics of Parallel Line Pivoted Pad Thrust Bearing
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 274~281
In this paper, linearized dynamic characteristics of parallel line pivoted pad thrust bearing (here-inafter refer to PLP thrust bearing) was analyzed by perturbation method with inlet pressure. Inlet pressure and excitation frequency influence dynamic characteristics of PLP thrust bearing at all operating conditions, such as angular pivot position, mass of pad. Therefore, the characteristics have to be analyzed with inlet pressure, excitation frequency, mass of pad and thickness of pad. Otherwise, the analysis may be over or under estimate.
Tribological Characteristics of Silicon Nitride on Elevated Temperature
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 282~288
A sliding friction and wear test for silicon nitride (Si,N4) was conducted using a ball-on-disk specimen configuration. The material used in this study was HIPed silicon nitride. The tests were carried out from room temperature to 1000
using self-mated silicon nitride couples in laboratory air. The worn surfaces were observed by SEM and the debris particles from the worn surfaces were analyzed for oxidation by XPS. The normal load was found to have a more significant influence on the friction coefficient of the silicon nitride than an elevated temperature. The specific wear rate was found to decrease along with the sliding distance. The specific wear rate at 29.4 N and 1000
was 292 times larger than that at room temperature. The main wear mechanism from room temperature to 750
was caused by brittle fracture whereas from 750
the wear mechanism was mainly influenced by the oxidation of silicon nitride due to the increased temperature. The oxidation of silicon nitride at a high temperature was a significant factor in the wear increase.
The Analysis of the Contact Stresses at the Cam and Follower Interface in the Direct Acting Type Valve Train System
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 289~294
This paper present the contact stresses, which considers the shear stress at the cam and follower interface in the direct acting type valve train system of a high speed engine. To determine the contact condition, the normal contact forces are calculated by using the lumped mass dynamic modeling. The line contact is considered between the cam and follower interface. The variations of dynamic stresses are presented as a function of camshaft rotational angle. Also the effects of various design parameters are investigated.
A Dynamic Simulation of the Slider in HDD
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 295~301
The dynamic simulation of slider in hard disk drive is performed using Factored Implicit Finite Difference method. The modified Reynolds equation with Fukui and Kaneko model is employed as a governing equation. Equations of motion for the slider of three degrees of freedom are solved simultaneously with the modified Reynolds equation. The transient responses of the slider for disk step bumps and slider impulse forces are shown for various cases and are compared for the iteration algorithm and new algorithm.
Fretting Wear Characteristics of STS304 Steel in Seawater
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 4, 2000, Pages 302~307
The fretting wear characteristics of STS304 steel in seawater were investigated experimentally. A fretting wear tester was designed to be suitable for this fretting test. This study was focused on the effects due to the combination of normal load, slip amplitude and number of cycles and corrosive environment as the main factors of fretting. The results of this study showed that the wear volume increased abruptly at slip amplitude between 70
by fracture of oxide layers but above that slip amplitude the wear volume increased steadily.