Showing papers in "Tribology International in 1980"

TL;DR: In this paper, it was shown that although the activation energies for static and sliding conditions are likely to be the same, the accompanying Arrhenius constants (A p ) will be very different, leading to very different oxide growth rates.

TL;DR: Early studies of the dry and boundary lubricated wear of metals concentrated on the most catastrophic wear conditions, severe wear and scuffing, and it was established how these states could be avoided by protective film formation as discussed by the authors.

TL;DR: In this article, the stiffness and damping coefficients for ideal operating conditions were determined and their reliability ascertained by vibration measurements on high-speed rotors for four practically important journal bearing designs and the significant effects on the static load capacity of the bearing and the stability behavior of the rotor-bearing systems are illustrated and discussed.

TL;DR: The Actidyne active magnetic bearing system as mentioned in this paper is an active magnet bearing system that obviates the need for lubrication and provides high accuracy of shaft position, but it is not suitable for use with a fixed number of contacts.

TL;DR: In this article, the kinematics and geometry of the finger follower valve gear used in three engines on the European market have been analyzed and the results of the analyses disclose some features that are common to all the designs and which may be related to features in the patterns of wear observed in the engines.

TL;DR: In this article, the authors present information on the resistance of several common bearing types to self-excited whirl, and on the dynamic coefficients of the oil film which influence the rotor system.

TL;DR: In this paper, the conditions which control the formation of an oil film between a cam and flat faced follower are discussed, and some preliminary experiments for attempting to measure the oil film thickness and the hydrodynamic pressure are presented.

TL;DR: Hard, friction reducing, wear-resistant coatings, in particular TiC, TiN, Ti(C,N), Cr 7 C 3, borides and combinations of these substances in composite layers, can be applied to steel, Ni(Co) alloys and cemented carbides by cvd and pvd as discussed by the authors.

TL;DR: There is now a general view that a fundamental understanding of the whole valve train tribology is necessary to produce solutions to problems which are expected to arise as engine technology develops over the next decade.

TL;DR: In this article, a high speed film of the forging of simple shaped workpieces with a hammer is presented, where the authors specify the nature and importance of the friction and wear problems which occur during hot forging.

TL;DR: In this paper, it was shown that when the two rotors are the same, the best stability is obtained from zero-misalignment; in cases where they are different, a certain amount of misalignment can be useful for better stability.

TL;DR: In this article, the authors presented computer generated design data in terms of load capacity and oil flow for multirecess hydrostatic journal bearings for various L/D ratios, recess to bearing area ratios, number of recesses etc.

TL;DR: In this paper, the friction characteristics of journal bearings made from cast graphic aluminum composite alloy were determined under mixed lubrication and compared with those of the base alloy (without graphite) and leaded phosphor bronze.

TL;DR: In this article, the reaction layers formed under Reichert wear test conditions in the presence of four different extreme pressure additives and hence to determine the wear prevention mechanism was found to correlate with the formation of a thin, sulphur-rich reaction layer in the worn surface.

TL;DR: In this paper, typical errors which are encountered in manufacture and the significance of each effect are considered. And evidence is presented which demonstrates the correlation that can be achieved between theoretical models and experimental measurements, which can be used by designers to assist in accurately predicting the performance of bearings whose errors of size and form (effect of tolerances) have been determined.

TL;DR: In this article, tricresyl phosphate (TCP), an aryl phosphate, and trioctyl phosphate, an alkyl phosphate were used in corrosion and four ball tests to determine their respective frictional characteristics.

TL;DR: In this paper, a semi-analytical solution was presented to obtain the pressure distribution, the load capacity, the frictional moment and the lubricant flow rate for a laminar flow, hydrostatic bearing with its axis offset from the rotation axis of the saw blade.

TL;DR: In this paper, the authors examined rotary slitting blades from several paper mills and found that the predominant wear mechanism is abrasion by a two-body mechanism, in which carbide particles are plucked from the surface of the blades, and a three-body mechanisms with hard particles released from the paper as dust.

TL;DR: In this paper, the fundamental mechanisms of the friction in vacuum of 3D transition metals in contact with copper were investigated by Auger emission spectroscopy, and the electronic structure of the metals was shown to be a better indication of frictional behaviour than compatibility ratings previously obtained.

TL;DR: In this paper, the use of small particle sizes in wear coatings is discussed and the control that can be maintained of the size and shape of the particles is described and the physical properties of the diamond coating used and the effect of particle shape, particle concentration and operating temperature on its performance under test conditions are investigated and the results obtained for a range of applications are presented.

TL;DR: In this article, the authors examined the oil-whirl instability in the context of rigid and flexible rotor systems and the use of external damping to militate against such instability is discussed.

TL;DR: In this paper, the wear resistance of three low temperature nitriding treatments when compared with the untreated v steel and a standard cyanide case-hardening treatment, under conditions of scuffing, abrasion, fretting and corrosion was evaluated.

TL;DR: Benzylamine and 20 related compounds were evaluated as preservatives in metal working fluids as mentioned in this paper, and they showed that they had excellent antimicrobial properties against mixed bacterial and fungal inoculations.