Showing papers in "Wear in 1961"

TL;DR: In this article, a simple quantitative expression for abrasive wear rate is developed, and the abrasive data of a number of earlier investigators is analyzed in terms of this expression. But the results of this analysis are limited, since the average loose abrasive grain spends 90% of its time rolling and only 10% of the time abrading the sliding surfaces between which it is situated.

TL;DR: In this article, the influence of chemical composition on seizure of copper alloys was investigated and it was assumed that for seizure of metals, not only must there be intimate contact of clean surfaces, but in addition an energy barrier must be overcome.

TL;DR: In this article, a discussion of several important aspects of evaluating wear resistance is presented, focusing on abrasion, which is a large area of the complex field of wear, and the merit of these several qualities should be checked by statistical mathematics to avoid erroneous conclusions and misplaced confidence.

TL;DR: In this paper, the authors describe some experiments carried out with plane thrust surfaces of the type used in radial-face seals, to study the pressures in the gap between the surfaces.

TL;DR: In this paper, the coefficient of friction of oriented PTFE was measured and it was found that the friction is dependent on the direction of sliding to a small but definite extent.

TL;DR: In this article, the influence of well-defined hydrocarbons on friction and wear under conditions of boundary lubrication in argon and in oxygen atmosphere has been studied with a four-ball machine.

TL;DR: In this article, the effect of temperature and abrasion patterns on the wear rate of a single tire was investigated and it was shown that the severity dependence of the relative wear rating of any two types of tyre is largely due to differences in their temperature and pattern coefficients.

TL;DR: In this paper, the static friction between two very clean oxide-free copper single crystal planes is studied by applying a horizontal force in a direction parallel to either [100] or [110] to a sphere placed on the horizontal surface of a fixed cube of the same crystallographic orientation.

TL;DR: In this article, the ringing of a wine glass by a wetted finger is due to the fall in μ with increasing velocity which occurs at low sliding speeds before full hydrodynamic lubrication sets in.

TL;DR: In this paper, a comparison of the wear resistance and cutting performance of various abrasive grits was made and it was found that the wear of abrasives could be described as occurring by attritious wear or by fragmentation.

TL;DR: In this article, a crosscylinder type of wear machine is described for use in conjunction with a standard center lathe for severe dry wear of a 60/40 brass rubbing on mild steel, where the wear rate is initially constant and then increases owing to the effect of transferred metallic films.

TL;DR: In this paper, the critical rotational speed at which inertia-induced cavitation is initiated in the lubricant film of hydrostatic thrust bearings is established and the bearing mass flow and bearing load capacity at speeds exceeding this critical are determined and presented in the form of master plots of flow and load for all speeds.

TL;DR: The coefficient of static friction under static loads with normal pressures of about 10,000 p.i. and under dynamically applied loads ranging from 10, 000 to 20,000p.i were determined as discussed by the authors.

TL;DR: The wear rates of wrought iron and two mild steels have been compared under closely controlled unlubricated conditions and a study has been made of the effect of relative humidity on wear rate and debris composition as mentioned in this paper.

TL;DR: In this paper, the surface chemistry of a Cu 2 O film has been studied at a sliding carbon-copper interface during the passage of electric current, and the effective temperature at which oxidation occurred was found to be the bulk temperature of the copper.

TL;DR: In this article, the course of metallic wear in the presence of white oil was investigated over a range of applied loads at two stress levels, 10,898 kg/cm2 and 4922 kg/ cm2.

TL;DR: In this article, it was found that brittle materials such as glass wear faster than metals of similar hardness, and that elastic materials, such as rubber and nylon, are abraded more slowly than moderately hard metals.

TL;DR: In this article, it was found that the slip decreases exponentially with an increase in speed and the magnitude and direction of load, the lubicating condition and the radial clearance also affect the slip.

TL;DR: In this article, the critical temperature of an oil film was determined in a modified four-ball machine for hard and relatively soft material at low rates of sliding, and only when both specimens were of hardened steel was the temperature of seizure independent of load.

TL;DR: A general discussion of methods of testing the abrasion resistance of flooring materials by fundamental methods, field trials and ABRasion machines, with criticisms of methods and proposals for a new approach can be found in this article.

TL;DR: In this article, high shear viscosity measurements have been made on over a dozen lubricating base oils and the effect of composition was studied with stocks of widely different viscosities and origin.

TL;DR: In this paper, the friction of a steel or plastic ball against a plastic ring at low speeds was measured and the influence of lubrication observed and interpreted in terms of the adhesion theory of friction.

TL;DR: In this paper, a study with various phosporus compounds added to a liquid environment showed a good correlation between the lubricating effectiveness and their chemical structure, which was demonstrated by the experimental results obtained with various amounts of active gases in a liquid lubricant.

TL;DR: In this paper, the authors deal with the measurement of oil film thickness between lubricated contacting surfaces under load and suggest relaxational effects in the lubricant and not pressure vicosity effects may explain in part the high load-carrying capacity of modern high speed gears.

TL;DR: In this paper, a report is given of laboratory tests with regard to wear by rotary drilling, percussion drilling, rotary-percussion drilling, and rotary and percussive roller bits in rock, with which the typical motion conditions and pressure conditions can be imitated on a small scale in a manner similar to real drilling.

TL;DR: In this paper, the results of abrasion tests of flooring materials on different machines are mostly at variance and an international group has examined these discrepancies more systematically, and concluded that many machines may give useful results for one type of floor, but it is exceptional for a machine to be capable of comparing a range of different types or judging new materials.