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  • MACHINE ELEMENTS AND PROCESSES
  • 1970-1974  (39)
  • 1965-1969
  • 1950-1954
  • 1935-1939
  • 1972  (39)
Collection
Keywords
Years
  • 1970-1974  (39)
  • 1965-1969
  • 1950-1954
  • 1935-1939
Year
  • 1
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    User's manual for the Simulated Life Analysis of Vehicle Elements (SLAVE) model (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The simulated life analysis of vehicle elements model was designed to perform statistical simulation studies for any constant loss rate. The outputs of the model consist of the total number of stages required, stages successfully completing their lifetime, and average stage flight life. This report contains a complete description of the model. Users' instructions and interpretation of input and output data are presented such that a user with little or no prior programming knowledge can successfully implement the program.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-123642 , ASD-ASTN-1519
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Performance of 40-millimeter-bore ball bearings with lead- and lead-alloy-plated retainers in liquid hydrogen at 1.2 million DN (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Forty-millimeter-bore ball bearings with lead- and lead-alloy-coated retainers were operated in liquid hydrogen at 30,000 rpm under a thrust load of 1780 N (400 lb.) Four different substrate materials were used for the retainer. Longer bearing run times were achieved with a lead-tin-copper alloy coating plated onto a leaded-bronze material (22.5 hr) and an aluminum-bronze alloy (19.3 hr). One bearing with a pure lead coating achieved the desired objective of 10 hr. This bearing had an aluminum - bronze substrate retainer and ran successfully for 12.4 hr. Additions of antimony to the lead provided an alloy coating with better wear resistance than pure lead; however, this coating was abrasive to the outer-race lands.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-6981 , E-6916
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Summary of nondestructive testing theory and practice (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The ability to fabricate design critical and man-rated aerospace structures using materials near the limits of their capabilities requires a comprehensive and dependable assurance program. The quality assurance program must rely heavily on nondestructive testing methods for thorough inspection to assess properties and quality of hardware items. A survey of nondestructive testing methods is presented to provide space program managers, supervisors and engineers who are unfamiliar with this technical area with appropriate insight into the commonly accepted nondestructive testing methods available, their interrelationships, used, advantages and limitations. Primary emphasis is placed on the most common methods: liquid penetrant, magnetic particle, radiography, ultrasonics and eddy current. A number of the newer test techniques including thermal, acoustic emission, holography, microwaves, eddy-sonic and exo-electron emission, which are beginning to be used in applications of interest to NASA, are also discussed briefly.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-2120 , BMI-NLVP-TM-71-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Performance of high speed ball bearings with lead plated retainers in liquid hydrogen for potential use in a radiation environment (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ball bearings (40-mm bore) with lead coated, aluminum-bronze retainers were operated successfully in liquid hydrogen at 30,000 rpm under a thrust load of 1780 newtons (400 lb) for running times up to 15 hours. The lead transfer films on the bearing surfaces prevented galling of bearing components. The lead coated retainers used in this investigation show promise for use in the high radiation environments, where polytetrafluoroethylene (PTFE) based materials are not suitable. Failure was a result of the loss of lead lubricant on the retainer-inner-land and ball-pocket surfaces. The longest bearing life (15 hr) was achieved with a lead coating thickness of 50 micrometers (0.002 in.) on the retainer. Other bearings had lives of 2 to 6 hours.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-6653 , E-6642
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Contamination character of materials in space technology testing. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Determination of the nature and degree of contamination of mirrors in a vacuum environment in the presence of UV irradiation by outgases from some materials that are candidates for use inside spacecraft and simulated spacecraft environments. A vacuum apparatus was developed for testing contamination of mirrors. Offgases from heated test materials are deposited on a refrigerated mirror, half of which is UV irradiated. Reflectance is measured between 1100 and 25,000 A. Thermofit RNF-100, insulated wire TRT-24-19-V-93, and Eccofoam FS and FPH gave heavier deposits on the nonirradiated mirror. Moxness MS60 SO8, Scotch Tape Y-9050, RTV-577, RTV-41, Stycast 1090, and Epon 934 and 828 gave heavier deposits on the irradiated mirror. Raychem wire 44/0411, polyimide tape X1156, Insulgrease G-640, High Vacuum Silicone Grease, and RTV-602 gave only slight deposits on the irradiated and nonirradiated areas of the mirror.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: AIAA PAPER 72-267 , American Institute of Aeronautics and Astronautics, Thermophysics Conference; Apr 10, 1972 - Apr 12, 1972; San Antonio, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    A solid state film transport (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A solid state film transport utilizing piezoelectric motion was evaluated and found to have potential in film positioning applications. The concept is particularly useful in flight equipment where torque motors and conventional transport mechanisms are difficult to apply. A demonstration model utilizing 5-inch film was designed, tested, and evaluated. Three basic operating modes were investigated. Design goals for step size were achieved under controlled conditions. The continuous mode test results were marred by an inability to transfer efficiently the piezoceramic motion to the film itself. The design, test results, and problem areas are described.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 127-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Aerospace reliability applied to biomedicine. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An analysis is presented that indicates that the reliability and quality assurance methodology selected by NASA to minimize failures in aerospace equipment can be applied directly to biomedical devices to improve hospital equipment reliability. The Space Electric Rocket Test project is used as an example of NASA application of reliability and quality assurance (R&QA) methods. By analogy a comparison is made to show how these same methods can be used in the development of transducers, instrumentation, and complex systems for use in medicine.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Adhesion, friction, wear, and lubrication research by modern surface science techniques. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The field of surface science has undergone intense revitalization with the introduction of low-energy electron diffraction, Auger electron spectroscopy, ellipsometry, and other surface analytical techniques which have been sophisticated within the last decade. These developments have permitted submono- and monolayer structure analysis as well as chemical identification and quantitative analysis. The application of a number of these techniques to the solution of problems in the fields of friction, lubrication, and wear are examined in detail for the particular case of iron; and in general to illustrate how the accumulation of pure data will contribute toward the establishment of physiochemical concepts which are required to understand the mechanisms that are operational in friction systems. In the case of iron, LEED, Auger and microcontact studies have established that hydrogen and light-saturated organic vapors do not establish interfaces which prevent iron from welding, whereas oxygen and some oxygen and sulfur compounds do reduce welding as well as the coefficient of friction. Interpretation of these data suggests a mechanism of sulfur interaction in lubricating systems.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Lubrication with solids. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Brief discussion of the historical background, variety range, chemistry, physics, and other properties of solid lubricants, and review of their current uses. The widespread use of solid lubricants did not occur until about 1947. At present, they are the object of such interest that a special international conference on their subject was held in 1971. They are used at temperatures beyond the useful range of conventional lubricating oils and greases. Their low volatility provides them with the capability of functioning effectively in vacuum and invites their use in space applications. Their high load carrying ability makes them useful with heavily loaded components. Solid lubricants, however, do lack some of the desirable properties of conventional lubricants. Unlike oils and greases, which have fluidity and can continuously be carried back into contact with lubricated surfaces, solid lubricants, because of their immobility, have finite lives. Also, oils and greases can carry away frictional heat from contacting surfaces, while solid lubricants cannot.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Chem Tech; May 1972
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Elemental analysis of a friction and wear surface during sliding using Auger spectroscopy. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
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