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  • 1980-1984  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Single pass major element x-ray fluorescence analysis of silicate rock samples using a Philips 1212 spectrometer (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 11 (1982), S. 100-108 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A ‘single pass’ method of analysing silicate rocks for their major element composition has been developed using a Philips 1212 x-ray fluorescence spectrometer. Samples need only be submitted once to the spectrometer and all ten major elements (SiO2, TiO2, Al2O3, Fe2O3T, MnO, MgO, CaO, Na2O, K2O and P2O5) are determined using a Cr x-ray tube and three analysing crystals, i.e. TIAP, PET and LiF220. The method has been evaluated in terms of the quality of the calibration lines for each element, the precision of replicated analyses and by the analysis of rock standards as unknown samples. The single pass method is rapid, facilitates on-line data reduction and is capable of producing high quality analytical data.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300110303
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    Paper (German National Licenses)
    Fulltext
  • 2
    facet.materialart.
    Unknown
    Large-bore tapered-roller bearing performance and endurance to 2.4 million DN (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The operating characteristics and experimental life estimates for 120.65 mm bore tapered roller bearings of two designs under combined radial and thrust loads were determined. A modified standard bearing design was tested at speeds up to 15,000 rpm. A computer optimized, high speed design was tested at speeds up to 20,000 rpm. Both designs were tested at a combined load of 26,700 N (6000 lb) radial load and and 53,400 N (12,000 lb) thrust load. Advanced helicopter transmissions which require the higher-speed capability of tapered-roller bearings also require higher temperature capability (ref. 2). Thus, materials with temperature capabilities higher than the conventional carburizing steels are required.
    Keywords: MECHANICAL ENGINEERING
    Type: Advanced Power Transmission Technol.; p 253-270
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Present technology of rolling-element bearings (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The present technology of rolling-element bearings, the barriers and limits which currently exist, and some of the future requirements that will demand further advancements are identified.
    Keywords: MECHANICAL ENGINEERING
    Type: Advanced Power Transmission Technol.; p 35-47
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Comparison of predicted and experimental thermal performance of angular-contact ball bearings (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Predicted bearing heat generation and bearing temperature were verified by experimental data for ball bearings over a range of sizes, shaft speeds, and lubricant flow rates. The computer program Shaberth requires, as input, a factor which describes the air-oil mixture in the bearing cavity for calculation of the ball drag contribution to bearing heat generation. An equation for this lubricant percent volume in the bearing cavity was derived and appears to be valid over the range of test conditions including bearing bore sizes from 35 to 167 mm and shaft speeds from 1.0 to 3.0 million DN.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-2275 , E-1751 , NAS 1.60:2275
    Format: application/pdf
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  • 5
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    Lubrication of optimized-design tapered-roller bearings to 2.4 million DN (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The performance of 120.65 mm (4.75 in.) bore high speed design, tapered roller bearings was investigated at shaft speeds to 20,000 rpm (2.4 million DN) under combined thrust and radial load. The test bearing design was computer optimized for high speed operation. Temperature distribution bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rates, and lubricant inlet temperature. The high speed design, tapered roller bearing operated successfully at shaft speeds up to 20,000 rpm under heavy thrust and radial loads. Bearing temperatures and heat generation with the high speed design bearing were significantly less than those of a modified standard bearing tested previously. Cup cooling was effective in decreasing the high cup temperatures to levels equal to the cone temperature.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1714 , E-270
    Format: application/pdf
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  • 6
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    Rolling-element fatigue life with traction fluids and automatic transmission fluid in a high-speed rolling-contact rig (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Rolling-element fatigue tests were run in standard and high-speed rolling-contact rigs at bar speeds from 5000 to 50,000 rpm to determine the effects of speed and lubricant film parameter on rolling-element fatigue life. AISI 52100 test bars were tested at a maximum Hertz stress of 4.83 GPa (700,000 psi) with three traction fluids and an automatic transmission fluid. Rolling-element fatigue life increased with speed, with the greatest increases occurring from 10,000 to 50,000 rpm. The life data tended to follow published life-versus-lubricant-film-parameter data up to a film parameter of approximately 3.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-2050 , E-1091 , NAS 1.60:2050
    Format: application/pdf
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  • 7
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    Lubrication of rolling-element bearings (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The lubrication of rolling element bearings is surveyed. Emphasis is on the critical design aspects related to speed, temperature, and ambient pressure environment. Types of lubrication including grease, jets, mist, wick, and through the race are discussed. The historical development, present state of technology, and the future problems of rolling element bearing lubrication are discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-81449 , E-370 , Intern. Lubrication Conf.; Aug 18, 1980 - Aug 21, 1980; San Francisco
    Format: application/pdf
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  • 8
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    Performance of computer-optimized tapered-roller bearings to 2.4 million DN (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The performance of 120.65 mm bore high speed design tapered roller bearings was investigated at shaft speeds to 20,000 rpm under combined thrust and radial load. The test bearing design was computer optimized for high speed operation. Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rates, and lubricant inlet temperature. The roller bearing operated successfully at shaft speeds up to 20,000 rpm under heavy thrust and radial loads. Cup cooling was effective in decreasing the high cup temperatures to levels equal to the cone temperature.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-81414 , E-332 , Intern. Lubrication Conf.; Aug 18, 1980 - Aug 21, 1980; San Francisco
    Format: application/pdf
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  • 9
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    Corrosion of simulated bearing components of three bearing steels in the presence of chloride-contaminated lubricant (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Corrosion tests were run with AISI 52100, AISI M-50 and AMS 5794 under conditions that simulate the crevice corrosion found in aircraft ball and roller bearings rejected at overhaul for corrosion. Test specimens were fabricated that simulated the contacts of balls or rollers and the raceways. Corrosion cells were assembled in the presence of a lubricant contaminated with water and chloride ions. The cell was then thermally cycled between 339 K (150 F) and 276 K (37 F). The corrosion observed after 14 cycles was that of crevice and pitting corrosion typically found in aircraft bearings. AMS 5749 showed a very slight amount of corrosion. No appreciable differences were noted between AISI 52100 and AISI M-50, but both showed much greater corrosion than AMS 5749. The corrosion pits observed in AISI M-50 appeared to be fewer in number but generally deeper and larger than in AISI 52100.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-82955 , E-1370 , NAS 1.15:82955 , Ann. Meeting of the Am. Soc. of Lubrication Engr.; Apr 24, 1983 - Apr 28, 1983; Cincinnati
    Format: application/pdf
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  • 10
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    Effect of carbide distribution on rolling-element fatigue life of AMS 5749 (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Endurance tests with ball bearings made of corrosion resistant bearing steel which resulted in fatigue lives much lower than were predicted are discussed. Metallurgical analysis revealed an undesirable carbide distribution in the races. It was shown in accelerated fatigue tests in the RC rig that large, banded carbides can reduce rolling element fatigue life by a factor of approximately four. The early spalling failures on the bearing raceways are attributed to the large carbide size and banded distribution.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-2189 , E-1243 , NAS 1.60:2189
    Format: application/pdf
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