Singular Integral Equations. By N.I. Muskhelishvili. Translated fromthe 2nd Russian edition by J.R.M. Radok. Pp. 447. F1. 28.50. 1953. (Noordhoff, Groningen)

One Hundred Years of Hertz Contact

Influence of lubricant properties on elastohydrodynamic lubrication

In this paper, a recent solution on the thermal-elastohydrodynamic lubrication of rolling and sliding cylinders is extended to consider a more rigorous analysis of temperature by using a two-dimensional finite difference method. The effect of the local pressure-temperature dependent viscosity, the compressibility effect of the lubricant and the heat from compression of the lubricant are considered in the solution of the Reynolds and the energy equations. Two series of results were obtained. The first is a heavily loaded series intended to correlate with Crook's experimental results, and the second is a moderately loaded series intended to correlate with experimental data (15). These results show that temperature has a moderate influence upon the shape of the pressure and film profile, but very little effect upon the magnitude of the film thickness in the contact zone. The frictional force, however, is strongly influenced by the temperature rise in the film. Crook's experimental film thickness data and tho...

A Refined Solution to the Thermal-Elastohydrodynamic Lubrication of Rolling and Sliding Cylinders

Self-lubricating polymer composites and polymer transfer film lubrication for space applications

The subject of wear of steam turbine bearings at low operating speeds was addressed by conducting site visits to inspect used bearings during overhaul disassemblies, by interviewing the turbine manufacturers and technical personnel at selected utilities, and by performing an analysis of the effect of bearing wear on lubrication at low operating speeds. There is a general lack of understanding of the mechanisms of bearing wear, but there is universal agreement that maintaining proper alignment and minimizing debris in the lubricant are critical to obtaining long bearing life. Wear problems definitely exist, but there is a variation in level of concern regarding these problems. Lift pumps systems on turbines using a low turning gear speed were not found to eliminate bearing wear. Many of the wide variations in bearing design philosophies regarding bearing wear appear to be related to the need for reliable wear-related design data. An analysis of lubrication at low speeds has shown that a limited amount of bearing wear may enhance bearing lubrication and that an optimum in the extent of this wear may exist. Experimental data are needed to develop an understanding of bearing wear mechanisms and bearing operation at low speeds.

Wear of Steam Turbine Journal Bearings at Low Operating Speeds

A Simplified Model of Cage Motion in Angular Contact Bearings Operating in the EHD Lubrication Regime

The Rheological Behavior of the Lubricant in the Contact Zone of a Rolling Contact System

Two methods have been evolved for finding pressure distributions in lubricating rolling contact. In the first method, the circumferential profile of the gap between rolling disks is found by using an X-ray technique, and the pressures are inferred from the observed deformations of the disks. Several profiles have been obtained for a range of loadings, temperatures, and rolling speeds by using steel disks with polyphenyl ether as the lubricant, and plausible (though not greatly detailed) pressure distributions were derived from some of them. The second method uses a strip of manganin coaling on a glass disk which is loaded into lubricated, rolling contact with a second glass disk. The change in electrical resistance of the manganin due to film pressures is measured. The data recorded by this technique also appear to be reasonably reproducible and consistent. Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Washington, D. C, October 13–16, 1964.

J. W. Kannel

Papers

Wear of Steam Turbine Journal Bearings at Low Operating Speeds

A Simplified Model of Cage Motion in Angular Contact Bearings Operating in the EHD Lubrication Regime

The Rheological Behavior of the Lubricant in the Contact Zone of a Rolling Contact System

Methods for Determining Pressure Distributions in Lubricated Rolling Contact

A Hydrodynamic Lubrication Theory for Strip Rolling Including Thermal Effects