Showing papers in "Tribology International in 1987"

TL;DR: In this paper, a pair of transparent discs containing a hole or a surface crack produced artificially on the disc surface were compared with predictions by numerical analyses based on fracture mechanics, and the experimental results verified several important theoretical predictions on crack growth under rolling and/or contact conditions.

TL;DR: In this article, the dynamic friction-velocity relationship in the slip stage of stick-slip vibration was investigated with a pin-on-flat apparatus and a reasonable relationship was derived from the measured displacement and acceleration of the sliding element using a computing technique which provided smooth, reliable curves.

TL;DR: A finite element stress analysis computer program, FEMALES (an acronym for Finite Element Mechanical Analysis of Large Elastic Strain), has been developed specifically for the analysis of large deformations in elastomeric materials as mentioned in this paper.

TL;DR: In this article, a simplified thermal theory is applied to the traction curves experimentally determined on a four-roller machine, and characteristic parameters are obtained; it is shown that effects of molecular volume on the parameters are small and that the parameters were primarily related to the molecular structures.

TL;DR: In this article, the major processes that are likely to be involved in wear, namely, adhesion, abrasion, fatigue, delamination, and oxidation, are described.

TL;DR: An analytical method to determine the film temperature of circular journal bearings was developed in this paper, which considers the cavitation of the oil film and also recirculation and mixing of the lubricant.

TL;DR: In this paper, the conjoint interaction of blank surface roughness and lubricant at the tool/metal interface in sliding contact has been investigated, and a new hybrid roughness parameter, Bearing Length Product (BLP ), was defined and shown to have a functional relationship with the coefficient of friction.

TL;DR: In this article, wear and frictional test results from applications of these components in machines are given and the capabilities of fine ceramics are described, which are expected to be applied as new materials to many tribological components because of their superior heat resistance and corrosion resistance.

TL;DR: In this paper, a mathematical model to determine the stiffness and damping coefficients and the stability limit curves of a journal bearing in a non-laminar lubrication regime is described, showing the flow regime influence on the dynamic characteristics of cylindrical bearings and on the stability of a rigid rotor on rigid supports.

TL;DR: In this paper, calculations and experiments carried out on these bearings are discussed for two types of circular bearing pads with compliant surfaces, and the experimental set-up is explained in diagrams.

TL;DR: In this paper, the dynamic behavior of microasperities on sealing surfaces was observed through a hollow glass shaft with the aid of a microscope, an industrial video camera and a video tape recorder.

TL;DR: Adiabatic solutions for a finite width, hydrodynamic, misaligned journal bearing with non-Newtonian lubricants, obeying the power law model, are presented in this article.

TL;DR: In this article, the influence of combustion products, such as sulphuric acid and carbon soot, on the wear of the cylinder bore of diesel engines is discussed. But the impact of combustion conditions on the bore wear is not discussed.

TL;DR: In this article, the effect of TiC and TiN coatings on the scoring resistance and wear characteristics of gears was investigated, and it was found that the seizure resistance of the coated roller pair was larger than that of the uncoated roller pair.

TL;DR: In this article, the unlubricated wear of both sintered and non-sintered steels was investigated under different sliding conditions, and the wear rates agreed reasonably well with Archard's law and with data from other sources.

TL;DR: In this paper, the effect of the flexibility of bearing linings on the static and dynamic performance of a three-lobe journal bearing was studied, where the authors used the finite element method and an iteration scheme to solve the three-dimensional Navier-Stokes and the continuity equations governing the lubricant flow in the clearance space of the bearing.

TL;DR: In this article, an analysis based on the finite element method is presented for the incompressible hydrodynamic lubrication of a cylindrical-bore bearing subjected to different loading directions.

TL;DR: In this article, the effect of a magnetic field applied externally on boundary lubricating performance was investigated under sliding contact conditions by using a ball-on-disc type tester, and it was confirmed by measuring the change in surface contact potential that the surface reactivity of a carbon steel was increased by magnetizing.

TL;DR: In this article, chemical grinding oil additives were found to be effective in improving abrasive-belt grinding performance for both 19Cr-2Mo ferritic stainless steel and SUS 304 austenitic steel.

TL;DR: In this paper, the cooling effects of the lubricating oil supplied to a full journal bearing through two axial feed grooves each at right angles to the load line are studied.

TL;DR: A series of experiments have been conducted over the past ten years on the role of the chain-matching effect, not only on boundary lubrication but also widely on relevant interfacial phenomena as discussed by the authors.

TL;DR: In this paper, the principal characteristics of bore polishing, suggests causes and records the examination of a particular used lintern were described and analysed. And a laboratory wear machine was used to simulated bore polish conditions.

TL;DR: Etude de la resistance a lusure par deux types d'acier a outil allies ayant subi soit un depot chimique en phase vapeur de nitrure de titane soit a processus de diffusion for the formation de carbures de vanadium as discussed by the authors.

TL;DR: In this paper, a high pressure viscometer is described for use with oils containing polymers, and it is shown that the degree of viscosity loss for a particular polymer/ base-oil combination is independent of temperature and pressure.

TL;DR: In this article, a procedure for solving the Navier-Stokes equations for the steady, three-dimensional flow of a non-Newtonian fluid within a finite-breadth hydrodynamic journal bearing is described.

TL;DR: In this article, various condition monitoring techniques were applied during a laboratory engine test in order to understand the wear processes occurring and to determine a suitable method which could be applicable to the detection and diagnosis of abnormal engine conditions in practice.

TL;DR: In this paper, the state of the art for steel strip rolling in Japan is discussed, including coefficient of friction and oil film thickness, friction pick-up, and roll wear.

TL;DR: In this paper, a new type of aerostatic journal bearing in which the elastic deformation of an O-ring is used to improve its static characteristics is proposed. But the static characteristics of this bearing are determined theoretically by both the finite difference method and the small perturbation method.

TL;DR: In this paper, a chain wear rig was built to establish the wear mechanisms occurring in an unlubricated drive chain, based on the four-square power principle and designed to reduce test time whilst allowing accurate simulation of a conventional chain transmission.