摘要:

This paper deals with the effects of contact pressure and temperature on the shear strength of thin organic films. The experimental method involves depositing the material as thin films (ca. 3 nm to 500 nm) on smooth glass surfaces. The film is sheared by sliding over it indenters of fired glass. By varying the indenter radius from 4 μm to 2.5 mm and the load from 10 mg to 20 g, the contact pressure may be varied from 107Pa (1.4 × 103P.s.i.) to 8 × 109Pa (12 × 105p.s.i.). The temperature dependence of the shear strength is also studied. Two types of organic materials have been investigated. These range from simple low molecular weight compounds such as stearates, to more complex high molecular weight polymers, for example P.M.M.A.

ISSN:0569-8197    

DOI:10.1080/05698197408981452

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The hydrodynamic theory of lubrication for dynamically loaded journal bearings is extended to elastico-viscous lubricants. The Rivlin-Ericksen equation is assumed for the lubricant, with the second-order terms representing cross-stresses and stress relaxation.

ISSN:0569-8197    

DOI:10.1080/05698197408981453

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

A test rig for measuring the rate of evaporation of lubricant from an operating bearing into an evacuated space through a seal was built and data for two different seal designs were obtained. The evaporation data is found to fil a probabilistic function m =m0[1 − e−(1/a)β] where m = mass lubricant lost in time l. If vapor pressure data are available, one may then run accelerated tests at elevated temperatures, convert the data to a desired operating temperature and use the above function for predictive purposes.Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Atlanta, Georgia, October 16–18, 1973

ISSN:0569-8197    

DOI:10.1080/05698197408981454

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Plasma-sprayed composites, which have good oxidation-resistance and self-lubricating characteristics to 900 C, were developed. The composites are a nichrome matrix containing dispersed glass for oxidation protection and calcium fluoride for lubrication; they are applied to bearing surfaces by plasma spraying layers about 0.050 centimeters thick which are then machined to 0.025 centimeters. Oscillating bearing tests were performed in air to 900 C at unit radial loads up to 3.5 × 107N/M2(5,000 psi) and a thrust load of 1960N (440 lbs). Bearings with a composite liner in the bore were in good condition after over 50,000 oscillating cycles accumulated during repeated, bearing temperatures cycles between 25 and 900 C.Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28—May 2, 1974

ISSN:0569-8197    

DOI:10.1080/05698197408981455

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Dynamic response of a gas-lubricated, jet-engine main shaft seal was analytically established as a function of collar misalignment and secondary seal friction. Response was obtained by a forward integration-in-time (time-transient) scheme, which traces a time history of seal motions in all its degrees of freedom. Results were summarized in the form of a seal tracking map which indicated regions of acceptable collar misalignments and secondary seal friction. Methodology, results and interpretations are comprehensively described.Presented at the 28th ASLE Annual Meeting in Chicago, Illinois, April 30–May, 3, 1973

ISSN:0569-8197    

DOI:10.1080/05698197408981456

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Self-lubricating composites have been prepared by impregnation of various porous stainless steel matrices with PbO-SiO295–5w/o and CaF2-BaF238–62w/o. The composites have been tested to evaluate the influence of pore diameter on their characteristics. Lubricant properties have been evaluated in oxidizing atmosphere in the temperature range 25–650C through the rider wear and friction test.

ISSN:0569-8197    

DOI:10.1080/05698197408981457

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

A a investigation was conducted to determine the nature of the chemical interactions of oxygen and sulfur with iron when surfaces are stationary and also during sliding in a vacuum environment. Various gases that contained sulfur, oxygen, or both were adsorbed to iron al 23 C. The gases included oxygen, hydrogen sulfide, methyl mercaptan, and sulfur dioxide. Friction experiments were conducted with a hemispherical rider sliding on a rotating disk. An Auger cylindrical mirror analyzer was used to monitor the iron surface chemistry.

ISSN:0569-8197    

DOI:10.1080/05698197408981458

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The effect of internal stress on wear was investigated under boundary lubrication conditions. In most cases, the wear increased by tensile stress, particularly with active EP additives such as dilaurly hydrogen phosphite. On the other hand, the wear with oiliness improvers and inactive EP additives such as tricresyl phosphate was practically unaffected by stress.

ISSN:0569-8197    

DOI:10.1080/05698197408981459

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The friction coefficient and shear strength of thin layers of the inorganic coordination polymer {Cr[OP(C8H17)2O] [OP(CH3)(C6H5)O]2}xhave been measured at room temperature at pressures up to about 3.5 kbars. The friction coefficient of this material is not independent of load as required by Amontons' classical law of friction, but rather, the friction coefficient decreases sharply with increasing load and approaches a small asymptotic value at high loads. This violation of Amontons' law is readily explained by a simple extension of the adhesion theory of friction in which effects of complete contact at the interface and the pressure dependence of the shear strength of the sample are taken into account.Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Atlanta, Georgia, October 16–18, 1973

ISSN:0569-8197    

DOI:10.1080/05698197408981460

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

A study has been made of lubricating properties of some codeposited composites of metal-graphite fluoride platings.

ISSN:0569-8197    

DOI:10.1080/05698197408981461

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor