Showing papers in "Wear in 1984"

TL;DR: The third-body approach highlights the many features which are common to different types of materials in different kinds of rubbing contacts, and suggests that a picture which is globally coherent from a mechanical point of view, in that it obeys as a first step the laws of equilibrium and continuity, can be presented.

TL;DR: In this paper, a sequence of events involved in sliding wear is outlined, where the plastic deformation changes the near-surface microstructure in ways which make the material unstable to local shear.

TL;DR: In this paper, the adhesion, friction, wear and lubricated behaviors of both oxide and non-oxide ceramics are examined in contact with themselves, other harder materials and metals.

TL;DR: In this paper, an analytical method is presented which enables the crater and flank wear of tungsten carbide tools to be predicted for a wide variety of tool shapes and cutting conditions in practical turning operations based on orthogonal cutting data from machining and two wear characteristic constants.

TL;DR: In this paper, a review of the thermal and mechanical properties of sliding systems is presented, including mechanisms of frictional heating and the distribution of heat during sliding friction, the experimental measurement and analysis of surface and near-surface temperatures resulting from frictional heat, thermal deformation around sliding contacts and the changes in contact geometry caused by thermal deformations, and the thermomechanical stress distribution around the frictionally heated and thermally deformed contact spots.

TL;DR: The slow progress in the understanding of scuffing and running-in of most lubricated surfaces is probably due to an inadequate understanding of the details of asperity deformation and oxide formation as discussed by the authors.

TL;DR: Experiments have been carried out between polytetrafluoroethylene (PTFE) sliders filled with polar graphite, Pb 3 O 4, MoS 2 and CuS in different proportions and combinations rubbing against flat counterfaces of mild steel and glass as mentioned in this paper.

TL;DR: In this article, the wear behaviour of several rail steels in rolling-sliding contact with a tyre steel is investigated in the laboratory using an Amsler wear testing machine.

TL;DR: The origins and development of the oxidational theory of mild wear under conditions where the ambient temperatures are sufficiently low that no significant oxidation can occur outside the instantaneous real areas of contact between two sliding surfaces are reviewed in this article.

TL;DR: In this paper, the life of such tools or machine elements as well as their performance are considerably increased, provided that the adhesive strength and the intrinsic cohesion of the coating are sufficient.

TL;DR: The use of soluble Mo-S compounds as lubricant additive for reducing friction and wear, increasing load-carrying capacity, promoting fuel economy and as antioxidants is related to their structures and chemical properties.

TL;DR: In this article, three Zn-Al-based ternary alloys containing copper or silicon were produced by casting and their structures were investigated in the as-cast and heat-treated conditions.

TL;DR: In this article, a fine pointed stylus of tungsten and a single crystal of a softer metal (nickel) was used to measure the friction and adhesion of a model microasperity.

TL;DR: In this paper, the influence of graphite additions on the wear characteristics of cast Al-Si alloys, produced by compocasting followed by squeeze casting, has been assessed using a pin-on-disc wear test.

TL;DR: In this paper, the three principal types of adhesive wear, namely severe wear, moderate wear and burnishing, are described, and the transitions between them are discussed Burnishing, or material removal on a molecular scale, represents the least possible amount of adhesive wear, but we know little regarding the magnitude of the wear rate and methods of ensuring that a sliding system will operate in the burnishing regime.

TL;DR: The influence of surface roughness on the accuracy with which the Hertz theory predicts the contact pressure and contact area between a sphere and a plane is examined theoretically and experimentally as mentioned in this paper.

TL;DR: The changes in brake system configurations and the evolution of new friction materials which have occurred during the past decade or so to meet these new requirements are described in this article, which is a good starting point for this paper.

TL;DR: In this article, the authors described the currently outstanding multilayer coatings and practical examples are given which demonstrate their effect when machining both steel and cast iron, and explained the reasons why these thin layers of hard material give considerable increases in tool life.

TL;DR: In this paper, the authors investigated the cavitation erosion resistance of high purity base metals (aluminium, cobalt, chromium, copper, iron, magnesium, molybdenum, nickel, tungsten and zinc).

TL;DR: In this article, the mechanism of electrical contact resistance between lightly loaded sliding surfaces was investigated and it was found that the increase in contact resistance of non-noble or base metal contacts, such as Sn-Pb, is due to the oxidation of metallic wear debris that gets entrapped at sliding contacts.

TL;DR: The potential of modern ceramics as wear-resistant materials is outlined in this article, with particular reference to the micro structure and physical properties of magnesia-partially stabilized zirconia (magnesia-PSZ): it is suggested that these properties make magnesia PSZ an attractive tribological material.

TL;DR: In this paper, the material produced at the friction interface and the material removal mechanism were investigated for the rubbing of silicon nitride in water, and the results suggested that the oxidized silicon oxide was changed by friction to an amorphous hydrate SiO2·xH2O during rubbing in water.

TL;DR: In this article, the reaction film formed with a zinc dialkyl dithiophosphate and the wear particles was analyzed using optical microscopy, scanning electron microscopy and X-ray energy spectrometry.

TL;DR: In this paper, the effect of grain size on the wear rate of SiC abrasives with a grain size range of 3-150 μm was investigated in a tube end against a flat surface, and the results showed that the wear is primarily adhesive and the action of the abrasive particles is to promote the removal of metallic wear debris from the contact region.

TL;DR: In this article, a pendulum tester has been modified to perform single-point grooving, which has been found to correlate strongly with the abrasive resistance of these materials in different practical applications.

TL;DR: In this paper, the effects of steel heat treatments, slurry impingement angles and other slurry erosion test conditions on erosion rates were discussed and the mechanism of coal slurry degradation was determined.

TL;DR: In this article, the friction behavior of two commercial Fe-12%Cr alloys during reciprocating sliding in air at 100-400 °C has been studied and a model is proposed to account for the changes observed.

TL;DR: In this article, the influence of interface friction on the yield behavior of a high density polyethylene when it is compressively deformed to a large strain (25%) at high rates of strain in a split Hopkinson pressure bar (SHPB) is described and evaluated.

TL;DR: In this article, an entropy production model of the sliding process is constructed to study the individual energy dissipation mechanisms which act in plastic deformation in sliding, and the system considered is a geometric space in which metallic lattice defects can exist.

TL;DR: In this article, the effect of carbide size on the abrasion resistance of two cobalt-base powder metallurgy alloys, alloys 6 and 19, was conducted using low stress abrading with a relatively hard abrasive, A1 2 O 3.