Showing papers in "Wear in 1962"

TL;DR: A series of friction experiments were performed which provide confirmation that animal joints are weeping bearings and confirm that synovial fluid is an excellent lubricant for cartilage.

TL;DR: In this paper, the structure of silicon carbide abrasive papers is studied by microscopic examination of sections, and the information so obtained is used as a basis for a theoretical model of the abrasion of non-work hardening metals.

TL;DR: In this paper, the effects of clogging of bonded abrasives such as emery paper by worn-off metal, and of pick-up of abrasive particles by the metal surface, are also considered quantitatively.

TL;DR: In this paper, the authors describe three new surface characteristics that are useful in giving numerical values to certain components of surface roughness, such as friction, light reflection, and frictional properties.

TL;DR: In this article, a mechanism for graphite lubrication is suggested which involves a surface orientation of crystallites and the subsequent formation of the rollers responsible for the low friction coefficients under normal conditions.

TL;DR: In this article, the results of 1,200 tests for various combinations of materials and lubricants have shown that wear can be eliminated for a given amount of time if the shear stress is kept below, a certain fraction of the yield point in shear of the weaker of the two metals.

TL;DR: In this paper, the concept of the magnetohydrodynamic bearing was introduced and two types of bearings were analyzed: a hydrostatic thrust bearing with an axial current induced pinch and an infinite inclined slider with an applied magnetic field parallel to the bearing surface and perpendicular to the direction of motion of the slider.

TL;DR: In this article, an experimental study of the variation of wear volume as a function of test duration reveals that the four-ball wear process very frequently follows through three characteristic stages: (1) the running-in period, (2) the steady-state wear, and (3) the equilibrium stage.

TL;DR: In this paper, a statistical correlation was obtained between measured wear rates under these conditions and the coefficient of friction, the thermal stress resistance, and the thermal diffusivity of the mated materials on which wear predominated.

TL;DR: In this article, a review of the various types of plastic bearing materials and their frictional properties is presented, in the light of the bulk properties of the two main polymer groups and special features of design with this type of bearing together with their general applications are also considered.

TL;DR: In this article, the effect of adding solid lubricants either to the greases or to the polymer was investigated and it was shown that when lubricated with water the wear resistance of nylon 6 was improved by the addition of graphite.

TL;DR: In this article, the surface roughness of the steel appeared to have a very pronounced influence on wear when the formation of a semi-continuous layer of smeared brass on the steel was inhibited, and some information was gained about the influence of zinc content, composition of the atmosphere and crystallite size on the strength of the brass-steel junctions.

TL;DR: In this paper, the effect of an electrodeposited coating depends on the balance between the reduction of fretting damage and the deleterious effects of plating on the fatigue strength of the steel.

TL;DR: In this article, the wear and friction properties of pure and Al 2 O 3 -filled PTFE mated to stainless steel were investigated under reciprocating conditions, and spherical and irregular particles of comparable size (approximately 7 μ) were used as fillers.

TL;DR: Experimental data on static and kinetic coefficients of friction were reported for eleven combinations of clean metals, extending in three cases (Au on Au, Cu on Cu, Ni on Ni) from 300 to 20°K and the remainder from 80°K as discussed by the authors.

TL;DR: In this article, it was shown that dry wear of comparatively soft bearing materials which had both soft and hard phases was indirectly proportional to the applied load but was represented by the formula W = AP n where W is the amount of wear, P the load applied, and A and n constants; if the adhesion of material to the journal metal became severe, the value of n increased rapidly.

TL;DR: In this paper, the effect of glycols and glycerine on the performance of metal-plastic friction tests of short duration was investigated and the possibility of estimating the efficacy of lubricating media was shown.

TL;DR: In this article, a program of developing lubricants and lubrication techniques for high speed ball bearings operating over the temperature range from room temperature to 1,200°F, candidate lubricants were screened in a high-temperature, high-speed rolling disk apparatus.

TL;DR: In this article, the role of matter transferred from the electrode used to generate the sparks has been studied with special reference to the role transferred from a spark-hardened metal to a sparkhardened electrode.

TL;DR: A variety of methods are available for application to space vehicle lubrication problems, from standard fluid lubricated systems to use of solids which have been developed for very high temperatures.

TL;DR: In this paper, the load capacity of liquid metal lubricated slider bearings subject to an applied magnetic field transverse to the film is investigated and the optimum profile is determined and found to be the Rayleigh step form with the riser location and step height ratio dependent on the strength of the magnetic field.

TL;DR: In this paper, the frictional behavior between sliding contact specimens was studied over a temperature range of 80 to 1,300°F, and the relationship between the observed stick-slip behavior and the presence of surface films of specific compositions was discussed.

TL;DR: In this article, the effect of wear particles in raising the wear rate of unlubricated sliding metals was examined using the Okoshi wear machine, in which a hard peripheral surface of a rotating disc is pressed against the specimen plane with a load increasing in proportion to the square root of the sliding distance.

TL;DR: In this paper, the time dependence of dry friction as a function of stress and strain in the contacting surfaces is analyzed and an equation describing friction describing material properties and time is derived, which can be predicted theoretically if certain rheological properties of the materials are taken into account.

TL;DR: In this paper, the friction and wear properties during abrasion of compressed compacts made from ball-milled graphite powder are shown to vary systematically with the pressure of compaction.

TL;DR: In this article, the interaction of abrasion and corrosion has been studied in a single cylinder horizontal slow speed diesel engine burning residual fuel, where samples of lubricating oil extracted from the cylinder during running have been subjected to chemical, X-ray and spectrographic analysis.

TL;DR: In this article, it is shown that junction growth occurs until the normal stress over the junction falls to a fixed proportion of the yield shear stress of the specimen when slip occurs.

TL;DR: In this paper, the conditions under which air films are formed between electrographite brushes and slip-rings were investigated and it was shown that aerodynamic pressures both above and below atmospheric can exist when the brush is inclined to the slip-ring at angles between 1.10−3 and 5.2−2 rad.

TL;DR: In this article, the surface is covered with Araldite which is allowed to set and then ground and polished parallel to the surface until the features of the surface are just exposed.