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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
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Experimental Parametric Study on the Rotordynamic Characteristics and Optimal Design of a Flexible Rotor Supported by a Slotted-Ring Electro-Rheological Squeeze Film Damper
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 157~165
A discharge free Electro-Rheological Squeeze Film Damper (ER-SFD) with predetermined-clearances at leakage ends can inherently eliminate electric discharge problems while still supplying stable leakage control. Test results show that the damping force of the slotted-ring ER-SFD is mainly affected by electric voltage, oil supply pressure, position of the damper and ratio of effective surface area of slotted-rings. As the supply voltage is larger, the amplitudes of both slotted ER-SFD and rotor are decreased at first and second critical speeds. The influence of the oil supply pressure and the effective surface area ratio was shown mainly near the first critical speed. The effective surface area ratio of slotted-rings influences the reduction of flexible rotor vibration. As a result, experimental results confirm that the slotted-ring ER-SFD satisfactorily controls the flexible rotor vibration, while eliminates the inherent electric discharge problems in conventional ER-SFDs.
Friction and Wear Behaviors of Conventional Composite Resins
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 166~172
The friction and wear characteristics of dental composite resins such as Charisma, Elitefil, TPH and Veridonfil were investigated. Furthermore, The surface characteristics examination, the analysis of contents of filler, Victors hardness and fracture toughness measurement of composite resins were preformed. The wear test applied ball to move reciprocationally on flat wear tester at room temperature. Microstructure of surfaces and worn surfaces were observed by SEM. Experimental results indicate that the friction coefficient of TPH was quite low, and the wear resistance of TPH was better than that of Charisma, Elitefil or Veridonfil at the same condition. The main wear mechanism was found to be plastic flow and abrasive wear by failure of filler's bond to the matrix.
An Experimental Study on the Anti-corrosion and Anti-wear Characteristics of MoS
Bonded Films for Automotive Wheel Joints
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 173~181
Friction, wear and corrosion characteristics of various MoS
bonded film lubricants were investigated to apply them to automotive wheel joints. MoS
bonded film lubricants were formulated by combinations of several additives and binders, and they were coated onto the pre-treated surfaces of specimens. Friction and wear characteristics were evaluated with Falex pin & vee-block test and LFW-1 block-on-ring test. For the corrosion resistant characteristics of the films, salt solution spray corrosion tests were performed. Results showed that MoS
bonded films containing both inorganic and organic corrosion-resistant additives yielded a synergy effect on anti-corrosion resistance. Also, binders having the better water-proof and thermal stability showed the lower friction and higher corrosion resistance.
The Changes of Residual Stresses on Sliding Surfaces during Break-in and Scuffing
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 182~187
In this paper the residual stresses on lubricated sliding surfaces were measured during break-in procedure and up to scuffing by the X-ray diffraction method. The cylinder-on-disk type tribometer was used with the line-contact geometry. Scuffing tests were done using a constant load. In the break-in procedure the loads were increased from very low values in several steps. It was found that the sliding surfaces with break-in represented relatively higher values of residual compressive stresser than those without break-in. The residual stresses below the surfaces showed the small amount of stress increases. The results of scuffing tests with and without break-in showed the same trends as break-in tests did. However, in case of tests with break-in procedure the stresses below the surfaces showed very large increases in the residual compressive stresses. From the tests of break-in and scuffing, it was found that the increases in scuffing lives were related with the increases of residual stresses on the lubricated sliding surfaces with break-in.
Effect of Environment on the Tribological Behavior of Si-incorporated Diamond-like Carbon Films
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 188~193
An experimental study was performed to discover the effect of environment on the tribological behavior of Si-incorporated diamond-like carbon(Si-DLC) film slid on a steel ball. The films were deposited on Si(100) wafers by a radio-frequency glow discharge of mixtures of benzene and dilute silane gases. Experiments using a ball-on-disk test-rig was performed in vacuum, dry air and ambient air conditions. It was observed that coefficient of friction decreased as the environment changed from vacuum, to dry air. Chemical analyses of debris suggested that low and stable friction is closely related to the formation of silicon-rich oxide debris and the rolling action.
The Effects of Niobium on Sliding Wear Characteristics of High Speed Steel by Powder Metallurgy
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 194~200
In order to evaluate the effect of Nb on wear properties of high speed steel(HSS) by powder metallurgy, niobium-alloyed HSS have been prepared by adding 0%, 1%, 3% and 5%Nb to HSS of 6%W-5%Mo-4 %Cr-5%V-5%Co. Sliding wear tests were conducted at various sliding speed conditions under the constant pressure using a pin-on-disc type machine. The results of this study show that the wear resistance of HSS by powder metallurgy was increased by the addition of Nb within the range of sliding speed used in this experimental study. However, the amount of Nb did not improve the wear resistance. It may be due to the thermal stability of carbide and high temperature properties of the matrix containing Nb comparing to that without Nb.
Non-Steady Elastohydrodynamic Lubrication Analysis on the Cam-Roller of Valve Mechanism for a Marine Diesel Engine
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 201~207
The numerical procedure to analyze a non-steady 3-dimensional elastohydrodynamic lubrication on the cyclically loaded contact has been newly developed. The procedure was applied on the cam-roller contact of the valve mechanism for the marine diesel engine. Both the pressure distribution and the film thickness between the cam and roller follower were calculated for each time step of the whole cycle. The pressure spike is shown at the outlet of the roller edge and it is getting higher as the external load is increased. The film thicknesses in the result of the non-steady analysis have a tendency to increase compared to those in the result of the analysis with the assumption of steady state. Therefore, the surface roughness of the non-steady contact need not be limited below that of the steady contact of the equivalent operating conditions.
A Study on Thermohydrodynamic Turbulent Lubrication of High Speed Journal Bearing Considering Thermal Conditions on Walls
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 208~217
Turbulence in journal bearing operation is examined and the thermal variability is studied for isothermal, convective and adiabatic conditions on the walls within some degree of journal misalignment. An efficient algorithm for the solution of the coupled turbulent Reynolds and energy equations is used to examine the effects of the various factors. The calculation data of turbulent analysis are compared with those of laminar analysis. Heat convection is found to play but a small role in determining friction and load. The friction distribution patterns through the journal bearing are now different with high values at the upstream region of the bearing due to the high speed and low temperature, and a sudden decrease past the pressure maximum.
Surface Temperature in Sliding Systems Using the En Finite Element Analysis
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 218~222
Finite element equations by using fast Fourier transformation were formulated for studying temperatures resulting from frictional heating in sliding systems. The equations include the effect of velocity of moving components. The program developed by using FFT-FEM that combines Fourier transform techniques and the finite element method, was applied to the sliding bearing system. Numerical prediction obtained by FFT-FEM was in an excellent agreement of experimental temperature measurements.
Friction Reduction with Oil-Soluble Organo-Molybdenum Compound and Environmental Effect
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 16, issue 3, 2000, Pages 223~230
Factors influencing friction reduction with MODTP(molybdenum dialkyl dithiophosphate) lubricant were investigated through a frictioning experiment using two-cylinder edge surface frictioning tester and XPS surface analysis. The friction reduction effect gained with MoDTP lubricant appeared to be largely attributable to MoS
formation on the frictioning interface. Under N
atmosphere, Mo diffused into the metal substrate, easily escaping from MoS
so the friction reduction effect from MoDTP was not gained. However, when an oxide surface film was preliminary prepared on frictioning surface, this Mo diffusion to metal substrate from MoS
was effectively inhibited. Then desired lubulication effect of MoDTP was gained even under N
atmosphere. As such, the existence of a surface oxide film on the frictioning surface was concluded to be of essential importance in order to gain a lubrcating effect with MoDTP.