Recently added articles from Tribology Transactions:
Study on the Life Distribution and Reliability of Roller-Based Linear Bearing
Jul 01, 2008; ... A study on the life distribution and reliability for a roller guide with cage was carried out with a total number of 90 test samples in two lots (N^sub s^ = 38 and 52), and different fatigue life distribution functions, such as the two and three parameter Weibull distributions, and the ...
Friction and Wear Properties of Cyanex 302-Modified MoS^sub 2^ Micro-Sized Spheres as Additive in Liquid Paraffin
Jul 01, 2008; ... The friction and wear properties of MoS^sub 2^ micro-sized spheres (MS-MoS^sub 2^) modified by Cyanex 302 (bis(2,4,4-trimethylpentyl) monothiophosphinic acid) as additive in liquid paraffin (LP) were studied and compared with those of commercial colloidal MoS^sub 2^ (CC-MoS^sub 2^) on a ...
Friction and Wear Performance of Tetraalkylammonium Thiomolybdates in Aqueous Solutions
Jul 01, 2008; ... Aqueous solutions of three tetraalkylammonium thiomolybdates (R^sub 4^N)^sub 2^MoS^sub 4^ (R = methyl, propyl, or hydrogen) were prepared and their tribological performance was tested using a pin-on-disc tribometer on a steel-aluminum contact. Tests were performed at the same conditions of load, ...
Erratum
Jul 01, 2008; ... Correction to "The Flow Factors Considering the Elastic Deformation for the Rough Surface with a Non-Gaussian Height Distribution" TAN ...
Effect of Particle Size on the Wear Resistance of Alumina-Filled PTFE Micro- and Nanocomposites
May 01, 2008; ... It was long supposed that the ability of hard particle fillers to reduce the wear rate of unfilled PTFE (typically ~10^sup -3^ mm^sup 3^/Nm) by an order of magnitude or more was limited to fillers of microscale or greater, as nano-fillers would likely be encapsulated within the large microscale ...
Stability and Flow Behavior of a Magnetorheological Lubricant in a Magnetic Shock Absorber
May 01, 2008; ... Interest in the use of field-responsive fluids in the automobile industry is growing in view of the increasing capabilities of electronic control in the vehicle's dynamic response. This is the case of magnetorheological fluids or lubricants (MRF). These are capable to change in very short times ...
Effects of Sulfur Additive EP in Ester Coolants during Friction with CBN
May 01, 2008; ... A study was undertaken to investigate the effects of the EP additives during tribological tests using a CBN tool against steel. Ester oil with and without sulfur additive were used as lubricants in a tribometer. Tribochemical interactions between the S additive and steel have been investigated ...
Performance Analysis of Double-Bump Air Foil Bearings
May 01, 2008; ... This paper presents a theoretical model for the analysis of double-bump airfoil bearings (AFBs). The stiffness and damping coefficients of the double bump vary depending on the external load and its friction coefficient. In the case of a lightly loaded condition where only the upper bump ...
Real-Time Viscosity Measurement for Condition-Based Monitoring Using Solid-State Viscosity Sensor
May 01, 2008; ... For optimal condition-based monitoring the measurement of viscosity is essential. Consideration of the manufacturing sector renders laboratory approaches as unsuitable, due to the lag-time between sampling and results reporting. Therefore, the continuous measurement approach has been considered ...
Sensitivity of Air-Coupled Ultrasound and Eddy Current Sensors to Bearing Fault Detection
May 01, 2008; ... For decades, vibration and oil analysis have usually been used to detect early bearing faults and track their progression over time. Progress has been seen in condition monitoring through vibration analysis of rolling element bearings using improved sensors and advanced signal processing ...
Permeability of Sinter Bronze Friction Material for Wet Clutches
May 01, 2008; ... The characteristics of wet clutches are of great importance for the overall behavior of the drive trains of many modern vehicles. It is considered that the clutch characteristic is affected by the permeability of the friction material. The permeability is considered to influence both the time of ...
Enhancement of Engine Oil Wear and Friction Control Performance through Titanium Additive Chemistry
May 01, 2008; ... Traditionally, wear protection and friction modification by engine oil is provided by zinc dithiophosphate (ZDDP) or other phosphorus compounds. These additives provide effective wear protection and friction control on engine parts through formation of a glassy polyphosphate antiwear film ....
Theory of Cavitation in an Oscillatory Oil Squeeze Film
May 01, 2008; ... The present knowledge on cavitation in oil film bearings is reviewed, and the inadequacy of the nowadays widely used method of designing dynamically loaded oil film bearings is pointed out. A new model of dynamic cavitation in submerged oil film bearings is proposed. The model preserves mass ...
Experimental Study of Cavitation in an Oscillatory Oil Squeeze Film
May 01, 2008; ... A displacement-controlled parallel-plate squeeze film test apparatus was designed and built to study the cavitation of oil films. Simultaneous pressure measurement and high-speed photography were conducted in the experiment. The study was aimed at comparing the measured results with the ...
Linear Squeeze Film with Constant Rotational Speed
May 01, 2008; ... Squeeze-film action in lubrication is present in many mechanical components, such as bearings, squeeze-film dampers, piston pins, and piston rings, as well as in natural and artificial joints. These mechanical components experience both rotation and squeeze action. In this paper, an experimental ...
Gaseous Cavitation and Wear in Lubricated Fretting Contacts
May 01, 2008; ... Fretting phenomena operating in the presence of grease was investigated experimentally and analytically. A fretting test rig was designed, developed, and equipped with a microscope and high-speed video camera to observe the effects of the lubricant entrainment within the contact during the ...
Analysis of Ball Bearings with 2, 3 or 4 Contact Points
May 01, 2008; ... An analysis of an arched ball bearing that considers centrifugal forces and gyroscopic effects is performed. Based on operating conditions of a 5 DOF inner ring and Coulomb friction model, the conventional bearing theory is extended from 2 to 3 and 4 contacts. The commonly used control criterion ...
Mist Generation from High-Speed Grinding with Straight Oils
May 01, 2008; ... High-speed grinding with plated-CBN wheels generally requires the use of straight oils as the metal removal fluid to obtain the required performance. Unfortunately, the combination of straight oils and high speeds results in high mist generation. In this study, several grinding oils were tested ...
Design, Fabrication, and Performance of Open Source Generation I and II Compliant Hydrodynamic Gas Foil Bearings
May 01, 2008; ... Foil gas bearings are self-acting hydrodynamic bearings made from sheet metal foils comprised of at least two layers. The innermost "top foil" layer traps a gas pressure film that supports a load while a layer or layers underneath provide an elastic foundation. Foil bearings are used in many ...