摘要:

A series of soluble metal phenoxides prepared from two phenols was investigated as high-temperature (to 371 C) anti-oxidants in polyphenyl ether (5P4E). Compounds from Group 1A (alkalis) and 2A (alkaline earths) were effective, but not in the same order as their inorganic oxide, hydroxide and carbonate counterparts studied earlier. High-temperature antioxidant activity of the phenoxides was not adversely affected by water-saturated air; the phenoxides were, however, subject to hydrolysis at 40 C by persistent exposure to liquid water. The phenoxides did not adversely affect the pyrolytic stability of the ether in the absence of air, although they were themselves slightly degraded.Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28–May 2, 1974

ISSN:0569-8197    

DOI:10.1080/05698197508982740

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A project has been conducted in support of the liquid metal cooled fast breeder nuclear reactor development, in which ball bearings have been designed, manufactured, and tested specifically for a typical reactor application involving operation in high temperature sodium.

ISSN:0569-8197    

DOI:10.1080/05698197508982741

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A spherical gas bearing is analyzed and tested for an airborne application. The externally pressurized bearing supports an inertially stabilized 36-in aperture, infrared telescope. The bearing provides the isolation of rotary motion from the aircraft and also serves as a seal between the aircraft cabin and cavity condition at 50, 000 ft altitude. The accompanying temperature gradient of 135 F across the 16-in diameter bearing created special design and manufacturing considerations. Test data of static load under temperature and vacuum environment were taken in support of the analysis.Presented of the 29th Annual Meeting in Cleveland, Ohio, April 28–May 2, 1974

ISSN:0569-8197    

DOI:10.1080/05698197508982742

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Conventional high-pressure hydraulic piston pumps require a delicate balance between clearance, surface finish, and pump materials if a long, efficient life is to be maintained.

ISSN:0569-8197    

DOI:10.1080/05698197508982743

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A method is described involving the measurement of the viscous desolidification (“pour”) point of wax-free lubricant fluids. This method is especially useful for pour point testing of experimental quantities, since only six to sixteen drops of the oil are required for a single determination (automatically performed in duplicate) with nearly full recovery of the sample. The technique consists of: (a) rapidly freezing a small, predetermined amount of the oil on the side of a small test tube to form a frozen drop of given dimensions; (b) immersing duplicates of the charged and stoppered tubes into a cold bath; and (c) measuring the temperature when the drop front has moved a predetermined distance as the bath warms up. Tests with experimental as well as commercial lubricants indicate excellent correlation with the ASTM D 97 pour point procedure. The repeatability of the test is ±2 F. The validity of the new procedure is substantiated by fluid flow theory.Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28–May 2, 1974

ISSN:0569-8197    

DOI:10.1080/05698197508982744

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This paper presents the results of scuffing tests performed with carburized AISI 9310 steel disks and a MIL-L-7808G oil, at a variety of sliding and sum velocities, and with disks ground both axially and circumferentially but with the same composite surface roughness. On the basis of these results, a methodology for correlating and predicting the thermal and scuffing behavior of sliding-rolling disks is suggested.

ISSN:0569-8197    

DOI:10.1080/05698197508982745

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This paper describes a method for calculating the pressure distribution, film profile, leakage rate and friction of a rectangular section rubber seal as used in hydraulic rams and jacks. The two basic equations, those describing the hydrodynamic pressure generation and the deflections of the seal surface have been solved simultaneously by numerical techniques. A solution was obtained which predicted film profiles qualitatively similar to those obtained experimentally. Solutions for outstrokes were obtained over ranges of variables as follows:sealed pressure (lbf/in2)…200–1,500500500sliding speed (ft/min)….150.5–25.015rubber hardness (IRHD).858555–85Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28–May 2, 1974

ISSN:0569-8197    

DOI:10.1080/05698197508982746

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

It is known theoretically and has been proved experimentally that, if both faces of a radial face seal, operating under a constant closure load, are misaligned, an axial vibration will occur. The frequency and amplitude of this vibration along with pressure distributions, friction torque, and leakage values are calculated here. Results show that a 4 to 1 increase in misalignment angle will cause the friction to drop by 20 percent, the leakage to increase by 100 percent, and the vibration amplitude to increase by 30 percent. This study will be extended to include other “surface defects” such as waviness. On the more fundamental side, flow considerations around the cavitation zone lead us to question the validity of the oil rheology model commonly used under actual working conditions.Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28–May 2, 1974

ISSN:0569-8197    

DOI:10.1080/05698197508982747

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

An experiment has been conducted to examine the independent influences of rolling speed and sliding speed on the scuffing of hardened steel discs lubricated by a mineral oil.

ISSN:0569-8197    

DOI:10.1080/05698197508982748

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor