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  • Weitere Quellen  (105)
  • STRUCTURAL MECHANICS  (56)
  • MACHINE ELEMENTS AND PROCESSES  (49)
  • 1970-1974  (105)
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  • 1970-1974  (105)
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  • 1
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    Noncontacting devices to indicate deflection and vibration of turbopump internal rotating parts (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: 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.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-CR-124208
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 2
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    The elastic layer with a cylindrical hole subjected to a nonuniform axisymmetric radial displacement. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A problem in the linear theory of elasticity is considered wherein a layer with a circular cylindrical hole is subjected to a nonuniform axisymmetric radial displacement. The solution utilizes Navier's equations of elasticity which are solved by means of extended Hankel transforms. A special case in which the radial displacement is a linear function of the axial coordinate is presented. Numerical results are given in graphical form for the case when hole radius and layer thickness are equal. The inversion integrals were evaluated numerically using Longman's technique for computing infinite integrals of oscillatory functions.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Acta Mechanica; 17; 1-2,; 1973
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Nonlinear vibrations of rectangular plates. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A finite-difference method is developed to determine the large amplitude dynamic responses of thin elastic plates subjected to uniform pressure pulse-type loads. Four different sets of boundary conditions are considered. Some specific problems are solved. The results are compared with approximate solutions obtained by Yamaki (1961). The numerical method presented provides an accurate and efficient approximate solution to the problem, and should be useful as a check on other approximate methods. The grid-size and the time-step necessary for obtaining numerical stability depend on the particular problem. For many cases the method converges rapidly and a rather large grid-size and time-step is adequate.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: American Society of Civil Engineers; Journal
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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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
    Publikationsdatum: 2019-06-27
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: ASME PAPER 73-LUB-D
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of Stress Corrosion Cracking Susceptibility Using Fracture Mechanics Techniques, Part 1 (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Stress corrosion cracking (SSC) tests were performed on 13 aluminum alloys, 13 precipitation hardening stainless steels, and two titanium 6Al-4V alloy forgings to compare fracture mechanics techniques with the conventional smooth specimen procedures. Commercially fabricated plate and rolled or forged bars 2 to 2.5-in. thick were tested. Exposures were conducted outdoors in a seacoast atmosphere and in an inland industrial atmosphere to relate the accelerated tests with service type environments. With the fracture mechanics technique tests were made chiefly on bolt loaded fatigue precracked compact tension specimens of the type used for plane-strain fracture toughness tests. Additional tests of the aluminum alloy were performed on ring loaded compact tension specimens and on bolt loaded double cantilever beams. For the smooth specimen procedure 0.125-in. dia. tensile specimens were loaded axially in constant deformation type frames. For both aluminum and steel alloys comparative SCC growth rates obtained from tests of precracked specimens provide an additional useful characterization of the SCC behavior of an alloy.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-124469
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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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
    Publikationsdatum: 2019-07-13
    Beschreibung: 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.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TM-X-68268 , E-7573 , Joint Lubrication Conf; Oct 16, 1973 - Oct 18, 1973; Atlanta GA; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Texturing in metals as a result of sliding (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: 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.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: NASA-TN-D-7136 , E-7160
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    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:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: ASME PAPER 73-LUB-22 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 9
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    The influence of nondestructive inspection parameters on the preproof and postproof fatigue crack detection limits for fracture mechanics applications (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The results of a preliminary NDI program to examine the variability of flaw size detection limits in terms of specimen thickness and NDI procedures is reviewed and reanalyzed in terms of the variables involved. Penetrant, X-ray, eddy current, and ultrasonic methods developed independently at three separate laboratories were used to examine specimens having a range of thickness. The results are discussed in terms of the variables of thickness and NDI procedures.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Symposium on Nondestructive Evaluation; Apr 25, 1973 - Apr 27, 1973; San Antonio, TX
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
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    Digital modeling of vibroacoustical processes generated by gearing (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: The statistical nature of vibroacoustical processes in transmission gears was studied using mathematical models. Special attention was given to high frequency components of vibroacoustical processes generated by spur gearing. Equations are given for describing torsional and tranverse vibrations of pairs of gear wheels when meshing, taking into account the flexibility of their supports.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 163-165
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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