Showing papers in "Wear in 1969"

TL;DR: In this paper, the main features of the abrasion of polymers are outlined in an attempt to formulate a general picture of the wear processes involved, and the relative roles of plastic and elastic deformation are first discussed and the wear phenomena on abrasive papers, metal gauze and rough metal surfaces are then described.

TL;DR: In this article, the authors studied the sand erosion behavior of a wide variety of metals and plastics in an air blast rig and found that the softer materials can exhibit an incubation period prior to stabilising to a linear erosion rate.

TL;DR: A critical review of some literature on the properties of liquids squeezed between two solid flats is presented in this article, where the experimental data are discussed and examined in detail, and it is found that the best model for such films is an ordered-liquid model in which the wall forces, though not strong enough to bind more than a few layers, induce long-range order in the fluid.

TL;DR: In this paper, the effect of the impact conditions and the properties of the impacting particles and the target surface on the extent of erosion were reviewed and further work is required to elucidate the mechanisms of erosion and relate material properties to erosion resistance.

TL;DR: In this paper, the authors determined the resistance to sliding abrasion for a 1040 steel, which was either hardened and tempered or cooled to produce various ferrite-pearlite structures.

TL;DR: In this article, a laboratory assembly was constructed to study the erosion wear of mild steel, and the following parameters were considered; the abrasiveness of ash, the velocity of impacting particles, the angle of impaction and the metal temperature.

TL;DR: In this article, the friction characteristics of unbonded molybdenum disulphide surface layers have been studied as a function of ambient humidity, specimen temperature, speed and load.

TL;DR: In this paper, the effect of external vibrations on friction at sliding speeds of 0.5 m/sec has been examined using steel and cast iron specimens with an antisample of cast iron.

TL;DR: In this paper, a series of untersuchungen befassen sich with dem Zusammenhang zwischen physikalischen, im Versuch ermittelten Stoss-and Verformungskenngrossen wie Stosskraft, Stosszeit, Stisskoeffizient, Eindringtiefe, and Verformationsenergie sowie dem bei wiederholter Stossbeanspruchung auftretenden Verschleiss metall

TL;DR: In this article, the vorhandenen Gleichungen zur Berechnung des Strahlverschleisses von Metallen are verwendet.

TL;DR: In this article, the main processes involved in run-in of cast iron are smoothing of the surface and formation of a surface coating derived largely from the graphite in the metal structure and iron oxide (Fe3O4).

TL;DR: In this paper, the authors compared the lubricating properties of suspensions of MoS 2 particles and solutions of molybdenum dialkyl-dithio-phosphate (MDDP) and ZDDP in tests on a Falex lubrication tester and a cam-cam-follower rig.

TL;DR: In this article, it was shown that nylon wears by forming a layer tightly adhering to the metal, which remains practically unaffected, with avional ∗ considerable wear of the metal also occurs.

TL;DR: In this paper, the basic laws of wear are obeyed and both flake and nodular graphite irons exhibit similar running-in, equilibrium and transitional wear behaviour, indicated by surface finish, appearance of the wear track, hardness and metallographic changes.

TL;DR: In this article, the orientation dependency of the coefficient of friction between two (100) surfaces of copper single crystals was measured in air, without lubricant and with molybdenum disulphide, a solid lubricant.

TL;DR: In this paper, the authors have studied the lubrication of heavily loaded sliding copper contacts by a low viscosity (10 cSt) dimethylsilicone fluid containing a small quantity of a fatty acid surfactant (stearic acid).

TL;DR: In this article, a high-speed rocket sleds, traveling at velocities approaching or exceeding 6000 ft/sec have been observed to cause a gouging type of damage to the steel guiding rail of the rocket track.

TL;DR: In this article, structural change of the surface layer of low-carbon steels due to abrading with the same material was investigated by X-ray analysis and electron microscopy, and it was found that the most favorable condition for maximum wear rate is characterized by the formation of a surface layer with small lattice strain and the nature of the first layer formed in the friction process plays a leading role in the wear process.

TL;DR: A survey of surface texture effects ranging from pipe flow roughness factors to molecular roughness concepts is presented in this article, with perhaps more emphasis on the elastomer-rigid surface interaction.

TL;DR: The wear resistance of dental tissues under hard and soft abrasives is discussed in relation to the appearance of a critical size effect and the degree of brittle fracture associated with the abrasion.

TL;DR: In this paper, the authors discuss the problem of a rotating multi-recess, externally pressurised bearing and the optimisation of a design for minimum power loss and leakage and maximum stiffness is shown to be a function of an operating parameter similar to the Sommerfeld Number for hydrodynamic bearings, ηN / P 8 ( cd / D ) 2.

TL;DR: In this paper, the results and observations obtained in cross-cylinder wear testing are discussed based on the results obtained in crossedcylinder testbeds of D2 and A2 die steels.

TL;DR: In this paper, a rig was constructed to enable visual studies of piston-cylinder lubrication to be made under conditions approaching as closely as possible to those obtaining during the induction and compression strokes of an engine.

TL;DR: In this article, the spherical shape of the graphite nodules in the nodular cast iron structure caused relatively large metallic particles to be produced even under mild wear conditions, which is known to be more susceptible to scuffing and seizing than is ordinary gray cast iron.

TL;DR: In this article, the wear characteristics of four different matrices of an S.G.∗ cast iron have been investigated under dry sliding conditions at a constant speed of 200 cm/sec over a load range of 0.35-27 kg.

TL;DR: In this paper, the authors evaluated the abrasion coefficients and relative wear resistances of the materials and provided further evidence that the wear mode was slow abrasive wear by hard abrasive.

TL;DR: In this article, the effect of particle shape on the abrasiveness of graphite and MoS2 is interpreted mainly in terms of the probability of crystals presenting edge faces to the surfaces in the sliding environment.

TL;DR: In this article, a twist compression bonding technique is used to determine the coefficient of adhesion in air for alloys of a variety of compositions from the solid solution systems Cu-Au, Cu-Ni, Au-Ag, Ag-Pd and Pt-Co.

TL;DR: In this paper, a simple theory is put forward which accounts qualitatively for the observed limitation of the frictional force and also predicts an experimentally verified lift of the sliders.

TL;DR: The packing rub effect is the unstable vibration induced by the friction forces and generated heat on a rotor when it rubs on a clearance annulus as mentioned in this paper, which is the main controlling factors are the friction characteristics at the sliding contact and the dynamic response of the rotor, bearings, supports and foundation system.