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  • Other Sources  (133)
  • MACHINE ELEMENTS AND PROCESSES  (133)
  • 1970-1974  (133)
  • 1965-1969
  • 1950-1954
  • 1935-1939
  • 1973  (49)
  • 1972  (39)
  • 1970  (45)
Collection
  • Other Sources  (133)
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  • 1970-1974  (133)
  • 1965-1969
  • 1950-1954
  • 1935-1939
Year
  • 1
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    Noncontacting devices to indicate deflection and vibration of turbopump internal rotating parts (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The research is reported which was conducted to develop devices for measuring vibrations and deflections of parts, such as impellers, shafts, turbine wheels, and inducers in operating turbopumps. Three devices were developed to the breadboard stage: ultrasonic Doppler transducer, flash X-rays, and light-pipe reflectance. It was found that the X-ray technique is applicable to the shaft assembly and the turbine seal of the J-2 pump, and the light-pipe-reflectance device appears to be ideal for cryogenic pump sections.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-124208
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Some observations of the relationship between film thickness and load in high Hertz pressure sliding elastohydrodynamic contacts. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-D
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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
  • 4
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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
  • 5
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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
  • 6
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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
  • 7
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    Optical analysis of ball bearing starvation (1970)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Optical measurement of oil film thickness in elastohydrodynamic rolling point contact of ball bearing
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-52869 , PROPOSED FOR PRESENTATION AT LUBRICATION CONF.; Oct 12, 1970 - Oct 15, 1970; CINCINNATI, OH; UNITED STATES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Performance of high speed ball bearings with lead and lead alloy plated retainers in liquid hydrogen at 1.2 million DN (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ball bearings with lead- and lead-alloy-coated retainers were operated in liquid hydrogen at 30,000 rpm under a thrust load of 400 lb. Bearing lives were compared using different: (1) lead- and lead-alloy coatings, (2) coating thicknesses, (3) substrate materials, (4) retainer locating surfaces, and (5) plating techniques. Longer bearing run times were achieved using retainers with a lead-tin-copper alloy coating electroplated onto a leaded-bronze material and an aluminum-bronze alloy. Thirty percent of the bearings tested achieved the desired objective of 10 hours. All of the lead-alloy coated retainers exceeded this objective. A coating thickness of at least 0.0014 in. was used for all bearings exceeding the 10-hour goal.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68268 , E-7573 , Joint Lubrication Conf; Oct 16, 1973 - Oct 18, 1973; Atlanta GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Effect of commercial 2219 and 2014 aluminum weld metal compositions (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Al weld metal compositions and hydrogen content effects on weld porosity, locating hydrogen in weld by radioactive tracers
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Texturing in metals as a result of sliding (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Sliding friction experiments were conducted with copper, nickel, iron, and cobalt sliding on themselves in air and argon. The resulting wear surfaces were examined with X-ray analysis to determine if surface texturing had occurred as a result of sliding. Results of the investigation indicate that, for the face-centered-cubic metals copper and nickel, a (111) texture develops with the (111) planes tilted 10 deg in the direction of sliding. The body-centered-cubic metal iron exhibited a (110) texture with the (100) direction oriented in the direction of sliding. It also exhibited a 10 deg tilt in the direction of sliding. The environment influenced the results in that the degree of texture observed in argon was less than that seen in air for iron. No texturing was observed for the close-packed-hexagonal metal cobalt. Recrystallization was observed with copper as a result of sliding.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7136 , E-7160
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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