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  • STRUCTURAL MECHANICS  (77)
  • ASTROPHYSICS
  • 1970-1974  (57)
  • 1960-1964  (20)
  • 1972  (57)
  • 1963  (15)
  • 1960  (5)
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  • 1970-1974  (57)
  • 1960-1964  (20)
Year
  • 11
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    Establishing an upper bound for window response to the sonic boom. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Study of the failure of glass windows, which is probably the most severe problem confronting the SST program outside of the psychological and sociological aspects. The structural configuration most likely to suffer a window failure due to sonic boom excitation is one representable by a single large room, a single large window, and an open door. It is suggested that if the open door were replaced with another window the resultant stresses in both windows would be substantially reduced.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 21; Mar. 22
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Strongly coupled stress waves in heterogeneous plates. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Consideration of coupled stress waves generated by an impulsive load applied at one end of a semiinfinite plate. For the field equations governing the one-dimensional coupled waves a hyperbolic system of equations is obtained in which a strong coupling in the second derivatives exists. The method of characteristics described by Chou and Mortimer (1967) is extended to cover the case of strong coupling, and a study is made of the transient stress waves in a semiinfinite plate subjected to an initial step input. Coupled discontinuity fronts are found to propagate at different velocities. The normal plate stress and the bending moment at different time regimes are illustrated by graphs.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 10; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    A non-linear dynamic lumped-parameter model of a rectangular plate. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: 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.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 21; Apr. 8
    Format: text
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  • 14
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    Vibrations of circular elastic plates due to sonic boom. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The problem of transient axisymmetric vibrations of thin circular elastic plates due to sonic boom excitation is investigated. The equation of motion for a solid circular plate is solved by applying the modified finite Hankel transform and the Laplace transform, and the numerical results are obtained with the help of the digital computer. From the analysis of the data, obtained for the dynamic deflections of the plates for the boom duration, it is concluded that for a normal flight the boom duration has a significant effect on the vibrations of plates as compared to the overpressure of the boom.
    Keywords: STRUCTURAL MECHANICS
    Type: Acoustical Society of America; vol. 52
    Format: text
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  • 15
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    The Drag on a Charged Satellite (1960)
    In:  CASI
    Details
    Publication Date: 2011-04-20
    Description: No abstract available
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Geophysical Research; 65; 10; 3493
    Format: text
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    NASA TECHNICAL REPORTS
  • 16
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    COMMUNICATIONS SATELLITES NEWS RELEASE (1963)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Communication satellites - echo i, echo ii, score, courier, telstar, relay and syncom
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Experience in Thermal-vacuum Testing Earth Satellites at Goddard Space Flight Center (1963)
    In:  CASI
    Details
    Publication Date: 2014-07-29
    Description: Thermal-vacuum environmental testing of satellites
    Keywords: STRUCTURAL MECHANICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    Structural analysis for a 40-story building (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: NASTRAN was chosen as the principal analytical tool for structural analysis of the Illinois Center Plaza Hotel Building in Chicago, Illinois. The building is a 40-story, reinforced concrete structure utilizing a monolithic slab-column system. The displacements, member stresses, and foundation loads due to wind load, live load, and dead load were obtained through a series of NASTRAN runs. These analyses and the input technique are described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 421-427
    Format: application/pdf
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  • 19
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    A design study for the addition of higher order parametric discrete elements to NASTRAN (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The addition of discrete elements to NASTRAN poses significant interface problems with the level 15.1 assembly modules and geometry modules. Potential problems in designing new modules for higher-order parametric discrete elements are reviewed in both areas. An assembly procedure is suggested that separates grid point degrees of freedom on the basis of admissibility. New geometric input data are described that facilitate the definition of surfaces in parametric space.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 361-373
    Format: application/pdf
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  • 20
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    An isoparametric quadrilateral membrane element for NASTRAN (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The geometric and kinematic properties of the element are described, along with development of the matrices and vectors which characterize the element. The necessity for considering small deviations from element planeness is discussed, and the approach taken to account for these deviations is described. The improved accuracy over the existing quadrilateral membrane is indicated by a sample calculation for which an analytical solution is available from beam theory. For the same finite element idealization, the errors in maximum displacement and stress were significantly reduced.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users' Experiences e; p 315-336
    Format: application/pdf
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