Showing papers in "Tribology International in 2002"

TL;DR: In this paper, a discrete wavelet transform (DWT) was used to detect single and multiple bearing race faults in the ball bearings of the inner race, outer race, and the combination faults.

TL;DR: In this paper, the authors reviewed the main findings of extensive research programs into the development of wear-protective layers, including a model that accounts closely for the observed effects of temperature on wear rates during like-on-like sliding, and showed that at low temperatures, the layers generally consist of loosely-compacted particles; at higher temperatures, there is an increase in the rates of generation and retention of particles while compaction, sintering and oxidation of the particles in the layers are facilitated.

TL;DR: A mathematical model for the interactions between corrosion and sliding wear of metals is proposed in this article, and a mathematical model is developed which incorporates the various factors affecting corrosion wear, including experimental and environmental conditions and material properties.

TL;DR: In this article, the Ti-6Al-4V and Ti-24Al-11Nb alloys were subjected to dry sliding wear against hardened-steel counter bodies and their tribological response was investigated.

TL;DR: In this article, the effects of sliding speed and normal load on friction coefficients of self-mated Si3N4 and SiC sliding in water after running-in in water were investigated with pin-on-disk apparatus at sliding speeds of 30 to 120 mm/s, normal loads of 1 to 14 N in ambient condition.

TL;DR: In this article, a theoretical study concerning the static and dynamic performance of a circular thrust pad hydrostatic bearing having recesses of different geometric shapes has been performed using the Finite Element Method.

TL;DR: In this article, the authors investigated the tribological behavior of PTFE composites against steel at cryogenic temperatures and found that the friction coefficient decreases with temperature down to 77 K, but did not follow a linear evolution further down to extreme low temperatures.

TL;DR: In this paper, the friction and wear behavior of sialon ceramics sliding against steel and lubricated by perfluoropolyethers (PFPE), tetrakis (3-trifluoromethylphenoxy)-bis(4-fluoro-phenoxy)cyclotriphosphazene (X-1P) and ionic liquid (1-methyl-3-octylimidazolium tetrafluoroborate, coded as L108) were investigated.

TL;DR: In this article, the corrosion behavior of two materials (Co-base Stellite X-40 and cast iron BS 3468 S2W) under aggressive slurry erosion conditions are considered.

TL;DR: In this paper, an example-based discussion of erosion-corrosion and flow corrosion processes that have been identified using electrochemical noise measurements is presented. But, the authors do not consider the effect of the number of potential noise signals in the electrochemical potential noise signal.

TL;DR: In this article, a micro-scale abrasive wear test based on ball-cratering was used to evaluate the wear resistance of duplex and non-duplex (Ti,Al)N, TiN and Cr-N coatings.

TL;DR: The wear-mechanism map for unlubricated sliding of steels can adequately predict the occurrence of mildoxidational wear and the trend of wear rates as well as describe the resultant features on the worn surfaces as discussed by the authors.

TL;DR: In this article, the major factors which determine the erodent particle impact wear process are described, and the influence of these factors on erosion rates can only be understood in terms of a quantitative model for slurry flow and particle impact and an assumption on the nature of the rate-controlling factor governing material loss.

TL;DR: In this article, the calibration curves of the friction area ratio for all of the five chosen friction models used in the finite element simulations do fit the experimental results, which indicates that calibration curves are more sensitive to friction at the tool/workpiece interface than those of the normal pressure.

TL;DR: In this paper, a steady-state mixed-TEHD (thermo-elasto-hydrodynamic) model for journal bearings is developed, which considers the fluid flow in the gap formed by rough surfaces, asperity contact, surface thermoelastic deformations, and a temperature-pressure-viscosity relationship for the lubricant, as well as an angular misalignment between the journal and the bearing.

TL;DR: In this article, the steady-state film pressures of hydrodynamic journal bearings were obtained by solving modified Reynolds equation based on the micropolar lubrication theory, with the help of the steady state film pressures, the steadystate performance characteristics in terms of load-carrying capacity, misalignment moment and friction parameter of a journal bearing were obtained at various values of eccentricity ratio.

TL;DR: In this article, the effect of branching on rheological properties and behaviour of thin liquid films of alkane has been examined and the results obtained in this paper could be helpful in designing new lubricants at the molecular level.

TL;DR: In this paper, a detailed transmission electron microscopy study of oxide and oxygen-containing phase formation during the sliding wear of metals, composites and coatings is provided, and a wide range of different materials types are reported in order to compare and contrast their oxidational wear behaviour: a low carbon stainless steel, a H21 tool steel containing 7%TiC particles, a 17%Cr white iron, an Al-Si/30%SiC composite, an Alloy Alloy (6092)−15%Ni3Al composite and finally a 3rd generation TiAlN/

TL;DR: In this paper, an analytical model was established to express plastically deformed contacts, based on plowing of a conical-shaped indenter with a hemispherical tip at a plastic deformed surface.

TL;DR: In this paper, the tribochemical and mechanical origins of wear of a microelectromechanical systems actuator (electrostatic lateral output motor) operated in very high vacuum (10 −7 torr) are reported.

TL;DR: In this article, the effect of new formulations of vegetable oils on surface integrity and part accuracy in reaming and tapping operations with AISI 316L stainless steel was investigated, and a widely diffused commercial mineral oil was used as reference for all measurements.

TL;DR: In this article, a numerical study of the performance for a dynamically loaded journal bearing lubricated with couple stress fluids is undertaken, where the generalized Reynolds equation for dynamic loads is simultaneously solved with the force balance equation of the journal, thus obtaining the transient oil film pressure, the transient position and velocity of journal center.

TL;DR: In this paper, the resistance network method was used to design an aerostatic rectangular bearing with X-shaped grooves, and the Newmark integration method and the modified RNM, which took into account the equilibrium of the mass flow rate and the squeeze film effect, were used to analyze the timedependent dynamic behaviors at each time step.

TL;DR: In this paper, a complete numerical solution for the thermal elastohydrodynamic lubrication (EHL) problem of a finite line contact between an infinite plane and an axially profiled cylindrical roller is obtained.

TL;DR: In this article, the effect of oil composition on the charging nature of base and formulated oils was investigated using a spinning disc tribocharging rig, and the results indicated that base oils are controlled by levels of impurities such as sulphur, and aromatic content.

TL;DR: In this paper, the characteristics of disk-type hydrostatic thrust bearings supporting concentric loads, simulating the major bearing/seal parts of water hydraulic pumps and motors, are presented.

TL;DR: In this paper, the Navier-Stokes equations were used to simulate the thermal EHL-contacts with contact pressures up to approximately 0.7 GPa, and the results from the simulations showed that it is possible to use the N-S equations for thermal energy simulation.

TL;DR: Tribo-corrosion is the term which describes the interaction between a tribological process with corrosion as mentioned in this paper, which may include sliding or abrasive wear, erosion by solid particles or liquid impact, or cavitation, fretting or fatigue.

TL;DR: In this paper, the role of atmospheres and lubricants in the oxidational wear of metals is reviewed and the effect of dissolved oxygen in the lubricants plays a very important role in the wear of metal.

TL;DR: In this paper, a permanent magnetic and hydrodynamic hybrid journal bearing is developed, where the force of the journal bearing comes from the hydrod dynamic film and the permanent magnetic field.