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  • Weitere Quellen  (1.097)
  • STRUCTURAL MECHANICS  (574)
  • MACHINE ELEMENTS AND PROCESSES  (523)
  • 1970-1974  (450)
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  • 11
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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
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    NASA TECHNICAL REPORTS
  • 12
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    A non-linear dynamic lumped-parameter model of a rectangular plate. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A lumped-parameter model of a rectangular plate is developed by assuming fundamental mode solutions and using Hamilton's Principle and the Euler equations to set up the differential equation of motion for the system. The plate theory used may be described as the dynamic analogue of the von Karman large-deflection theory. Four sets of symmetrical boundary conditions are considered with the restriction of uniform pressure dynamic loads. The model takes the form of a mass on a cubic-hardening spring with each term defined by algebraic expressions of the plate parameters. The results for some specific problems are compared with two previous solutions. This method is less accurate but simpler to develop and apply.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Journal of Sound and Vibration; 21; Apr. 8
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Adhesion and cohesion of metals in the space environment. (1966)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-11
    Beschreibung: Temperature, time and loading conditions for adhesion or cohesion of structural metals in vacuum
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: LUBRICATION ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    FACTORS INFLUENCING THE RATE OF METEOROID IMPACT ON A SATELLITE (1963)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-10
    Beschreibung: Factors influencing the rate of meteoroid impact on a satellite
    Schlagwort(e): STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    THE NATIONAL PROGRAM FOR THE EXPLORATION OF SPACE (1963)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-29
    Beschreibung: Nasa program for exploration of space
    Schlagwort(e): STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 16
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    Acoustical levitation for space processing (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: It is pointed out that many space-manufacturing processes will require the manipulation of weightless molten material within a container in such a way that the material does not touch the container wall. A description is given of an acoustical method which can be used for the positioning and shaping of any molten material including nonconductors such as glasses. The new approach makes use of an acoustical standing wave which is excited within an enclosure or resonator.
    Schlagwort(e): MACHINE ELEMENTS AND PROCESSES
    Materialart: Astronautics and Aeronautics; 12; July-Aug
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Nonlinear vibrations of rectangular plates. (1973)
    In:  Other Sources
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    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
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    NASA TECHNICAL REPORTS
  • 18
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    Four-pole parameters for impedance analyses of conical and cylindrical shells under axial excitations. (1968)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-12
    Beschreibung: Four pole parameters of truncated thin conical shell under axial excitations obtained by applying membrane shell theory
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: ; L AVIV AND HAIFA, IS
    Format: text
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    NASA TECHNICAL REPORTS
  • 19
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    A comparison of the capabilities of three finite element programs (1972)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Three finite element programs are compared to assess their capabilities as an analysis tool in a structural design process. Because of the need for repetitive analyses as an integral part of a design loop, a candidate program must be capable of handling large problems, operate efficiently, and be readily adaptable for use in computer-aided design. The three programs considered in the study, ELAS,SNAP, and NASTRAN, range from a relatively small finite element program limited to static structural analysis (ELAS) to a large complex general analysis system (NASTRAN). Results are given for comparative speeds and computer resources required for each program in the analysis of sample fuselage problems representative of practical aircraft design.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 277-287
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 20
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    Experiences in interfacing NASTRAN with another finite element program (1972)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The coupling of NASTRAN to another finite element program developed for the static analysis of automotive structures is discussed. The two programs were coupled together to use the substructuring capability of the in-house program and the normal mode analysis capability of NASTRAN. Modifications were made to the NASTRAN program in order to make the coupling feasible.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 111-119
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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