Showing papers in "Tribology International in 1997"

TL;DR: In this article, a diamond indenter is drawn across the coated surface under an increasing load (either stepwise or continuous) until at some load, termed the critical load, Lc a well-defined failure event occurs; if this failure event represents coating detachment then the critical Load can be used as a qualitative measure of coating-substrate adhesion.

TL;DR: In this article, the salient features characteristic of room temperature and elevated temperature erosion of metallic materials are described and a review of some of the recent results, which in their opinion, have enhanced our current understanding in the area of solid particle erosion of metal materials.

TL;DR: In this article, the wear traces and the transfer film were observed by scanning electron microscopy (SEM) and it was inferred that the transferred film contributed largely to the decreased friction coefficient and wear rate of the filled PEEK composites.

TL;DR: In this article, the chemical structures of P and S species in the X-ray absorption near edge structure (XANES) spectra of model compounds with known structure as fingerprints have been identified.

TL;DR: In this article, a review of experimental results which have contributed to improved understanding of sliding wear processes is presented, focusing on the chemical and structural changes which occur at and near the surface of metallic materials during sliding in different environments.

TL;DR: In this paper, the extent of the flank wear land has been determined using both textural and gradient operators; a texture operator has been implemented in the final system, which consists of a fibre-optic light source to illuminate the tool and a CCD camera (used in conjunction with a high resolution video zoom microscope) to capture the reflected pattern.

TL;DR: In this paper, the authors summarized the current understanding of wear modelling for metals and suggested some future possible directions for improvement, including wear mapping, temperature, shear strain response, boundary lubricating film strength, and surface roughness.

TL;DR: In this article, past trends in the study of various forms of metal wear and future trends and needs in wear research are discussed, as well as future trends in wear and wear research.

TL;DR: In this article, the authors compared three approximate methods of finding the area of contact, the contact pressure and the deformation in elliptical Hertzian contacts, and compared the results with the results given in this paper.

TL;DR: In this paper, the authors investigated the tribological behavior of amcrphous hydrogenated carbon (AHC) films in sliding contact with steel and identified four open issues: dependence of friction and wear on humidity, limitations on film thickness, deposition of films on substrates other than silicon and formation of lubricant-derived anti-wear films on AHC film surfaces.

TL;DR: In this paper, a study of the effect of anti-wear additives in vegetable oils was carried out using a four-ball wear tester, and the newly synthesized additive, di-butyl 3·5-di-t-tbutyl 4-hydroxy benzyl phosphonate (DBP) showed excellent antiwear performance compared with TCP under high speed and temperature conditions.

TL;DR: Abrasive wear resistance, abrasive wear mode and abrasive rate are discussed with experimental results as mentioned in this paper, and theories for abrasive wears theories are introduced and explained from the viewpoints of effective work for plastic deformation and fracture.

TL;DR: In this article, the frictional characteristics of molybdenum dialkyldithiocarbamate (MoDTC) and zinc dialkyltithiophosphate (ZnDTP) in a paraffinic mineral oil were studied using a two-roller machine, in which the synergistic effect for reducing friction was found for the oil containing Zn-DTP together with MoDTC.

TL;DR: In this article, a multilayered feed forward neural network trained with supervised Error Back Propagation technique and an unsupervised Adaptive Resonance Theory-2 (ART2) based neural network were used for automatic detection/diagnosis of localized defects in ball bearings.

TL;DR: In this paper, Uppsala University presented a selection of results from many years of scratch testing of PVD coated components, including adhesion assessment and coating quality determination to estimation of coating fracture resistance.

TL;DR: In this article, the effects of surface adaption on sliding surfaces and chemical changes occurring within a few nanometers of the surface are elucidated on a molecular level, both for the development of higher-performance lubricants, capable of high-temperature operation, as well as for the design of environmentally benign alternatives to the lubricant systems in current use.

TL;DR: In this article, a theoretical analysis of hydrodynamic squeeze film behavior for long partial journal bearings lubricated by fluids with couple stresses is presented, and the modified Reynolds equation governing the film pressure is derived by using the Stokes constitutive equations.

TL;DR: In this paper, the authors investigated the mechanical and tribological properties of amorphous diamond-like carbon (DLC) coatings deposited on Si(100) by a pulsed bias deposition technique.

TL;DR: In this article, the authors examined the design of hydrostatically balanced bearings as used in the slippers of high pressure axial piston pumps, and outline a design procedure whereby the slipper behaviour, minimum film thickness and loss of high-pressure fluid can be estimated.

TL;DR: In this article, the erosion wear and mechanical properties after exposure to simulated industrial service conditions in boilers of nickel-based, iron-based and chromium-nickel plasma-sprayed coatings on carbon steel and stainless steel have been obtained.

TL;DR: In this paper, a rapid method for evaluating the significant design parameters such as load capacity, maximum pressure, flow, power loss, and maximum temperature in the oil film is described.

TL;DR: In this article, the tribological properties of zinc dialkyldithiophosphate (ZDDP) antiwear additives in the sliding of steel against aluminum alloy were investigated by an oscillating friction and wear apparatus, an Optimol SRV tester.

TL;DR: In this article, the authors investigated the relationship between the wear debris morphology and the wear behavior of the bulk material and found that the fractal dimension of the worn debris was closely related to the wear behaviour of PEEK, and can be regarded as a measure of wear rate.

TL;DR: In this article, the antiwear performance of a borate containing nitrogen was evaluated and the four-ball test indicated that the wear scar diameters increased at first, but then decreased to and maintained a lower value after a critical maximum, when lubricated by an oil containing such borate surfaces.

TL;DR: In this article, the behavior of an elastomeric seal for a pneumatic cylinder piston is analyzed using a finite element model, and the simulation results obtained from experimental tests and numerical simulation are compared to determine the friction force between seal and cylinder bore.

TL;DR: In this paper, a model for micro-slip between a flat smooth surface and a flat rough surface is presented, where the smooth surface is covered with uniformly distributed ellipsoidal elastic bodies.

TL;DR: In this article, cracks are identified by employing a simple dislocation dipole model and taking into consideration the reverse sliding along dislocation layers and the influence of the distance between these layers.

TL;DR: In this paper, a modified four-ball machine was used to examine the coating performance and failure modes in a conventional steel ball bearing and hybrid ceramic bearing configurations, and the results showed the requirement for significant optimization of the coating before use in rolling element bearing applications.

TL;DR: In this article, the degradation mechanisms of silver coated copper contacts were studied under stationary loading, reciprocated sliding and fretting conditions, and the presence of a thin pre-grown corrosion film on top of the silver coating strongly influences the contact resistance, the friction and the degradation mechanism of the contact.