摘要:

The design, calibration, and use of a PRL high pressure capillary viscometer for the range of 0 to 10,000 psig is presented. The effects of drainage, kinetic energy correction, alignment, surface tension, bulk modulus of the glass capillary, density of the pressurizing gas, and solubility at the gas-liquid interface are discussed. Internal repeatability, as well as correlation with the ASME pressure-viscosity project falling ball viscometer, is shown. Viscosity-pressure data for several fluids and the effect of dissolved gas on the pressure-viscosity properties are demonstrated.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972127

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The friction and wear characteristics were determined for fourteen hexagonal metals in vacuum at temperatures to 850 F and sliding speeds to 2000 fpm. The metals examined included cobalt, titanium, zirconium, hafnium, beryllium, the rare earth metals, and binary alloys of some of these with other elements. Single crystals of cobalt were also examined to determine the influence of specifically oriented planes on friction. Differences in friction properties of these metals (e.g., cobalt and titanium) were found to be related to crystal slip systems and associated shear. Friction coefficients are further related to lattice parameters for fourteen hexagonal metals. For those hexagonal metals undergoing crystal transformation to a cubic form at elevated temperatures, marked changes were observed in friction and wear with the crystal transformation. While relatively moderate friction and wear is observed for the hexagonal form, high friction and complete welding is observed for the cubic structures. Selective alloying of other elements with these hexagonal metals was found to expand the crystal lattice and to delay crystal transformation, thereby improving friction and wear characteristics.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972128

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Friction measurements have been made on a series of layer lattice compounds selected from a number of different crystal systems. Experiments in ultrahigh vacuum confirm the vapor lubrication mechanism for natural graphite, pyrolytic graphite, and boron nitride. For all other lamellar solids studied there was no evidence that vapor lubrication played a role in the sliding mechanism. It is likely that vapor lubrication applies to lamellar solids only when relatively high specific forces are acting between the layers.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972129

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

In sliding tests, a weighted sled on PTFE runner, was pulled over a PTFE track by a stationary friction force. It was found that the sliding speed was influenced by rest periods between tests and by the nature of the preceding experiment. These time effects were investigated and are described.

ISSN:0569-8197    

DOI:10.1080/05698196608972130

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

A series of high load, low-speed sliding friction tests was made on eight greases and eighteen dry lubricants at normal unit loads from 10,000 psi to 150,000 psi. Four different substrate materials were used having a range of hardnesses from Rockwell C 18 to Rockwell C 55. The ultimate load capability of both greases and dry films is a function of substrate hardness with the best ultimate load capability being provided by inorganically bonded molybdenum disulfide films with small amounts of graphite added. The coefficient of friction of the greases appears to be an inverse function of substrate hardness and a direct function of the normal load. The coefficient of friction of the dry lubricants is an inverse function of the normal load, but does not appear to be related to the substrate hardness.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972131

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The development of a laboratory method for simulating the wear experienced by misaligned splines is described, and typical experimental data are presented. The experimental program involves the use of matched spline specimens subjected to relative oscillatory motion simulating angular misalignment, under the influence of an applied torque. The test specimens are maintained at 250 F, either with or without lubrication, in the presence of dry air, moist air, JP-5 fuel, or JP-6 fuel. The extent of spline wear is quantitatively monitored on a continuous basis.

ISSN:0569-8197    

DOI:10.1080/05698196608972132

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The introduction of a petrolatum containing solid powders, metallic and non-metallic, leads to an increase in adhesion between steel surfaces at low solid content. At higher concentrations the adhesion in most cases is reduced. All the lubricant mixtures increase the fatigue life of the specimens, but there is little correlation between adhesion and fatigue life. High adhesion gives a lower increase, and unbroken specimens are associated with a low adhesion.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972133

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The importance of surface temperature in disk and gear lubrication is well established so the methods to measure it need study. It is shown that a trailing thermocouple is liable to error. The oil film thickness in an Amsler disk machine as measured by voltage discharge is found to agree excellently with theory, providing the correct surface temperatures are used to obtain the oil viscosity. Next the effects of speed, load, viscosity, and surface finish on friction are studied. An empirical relation relating these measurements, as well as all other published data, is presented.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972134

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

An iterative method is developed for computing quasi-stationary temperatures in a large body due to a moving heat source on the surface, considering temperature dependence of thermal properties. Thermal properties of materials are classified into six categories. For surface temperatures encountered in the moving heat source problem for which the Peclet number is large, the function (fg)−1/2is identified as the indicator whether it is necessary to consider temperature dependence of the relevant thermal properties. The temperature dependence of density times specific heat and thermal conductivity in dimension-less form are given by f and g, respectively.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972135

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Variations and inconsistencies in the ratings of rocket engine lubricating oils on the Ryder Gear Tester prompted an analytical investigation into the mechanism of lubrication. It is considered that gears are lubricated on the disengaging side primarily to rapidly dissipate frictional heat. Based on this consideration, it is contended that oil nozzle position and depth of oil impingement are important variables. It is analytically shown by using the Ryder gears how these important variables could contribute to the load-carrying ability of oils and how these contributions could affect the Ryder ratings of oils.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972136

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor