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  • STRUCTURAL MECHANICS  (57)
  • ASTROPHYSICS
  • 1970-1974  (57)
  • 1960-1964
  • 1972  (57)
  • 11
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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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  • 12
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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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  • 13
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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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  • 14
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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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  • 15
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    Comparison of NASTRAN and STARDYNE static analysis of a graphite fiber reinforced plastic truss structure (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A static and buckling analysis of the ATS-F&G spacecraft reflector support truss (RST) and bridge truss assembly using NASTRAN was conducted. The RST is fabricated from a new material, graphite fiber reinforced plastic. A comparison is made with the NASTRAN results and the results of a similar analysis conducted using the stardyne program. The results of an actual static load test are also compared.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users' Experiences e; p 303-314
    Format: application/pdf
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  • 16
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    Analysis and design of on-grade reinforced concrete track support structures (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: For the improvement of rail service, the Department of Transportation, Federal Rail Administration, is sponsoring a test track on the Atchison, Topeka, and Santa Fe Railway. The test track will contain nine separate rail support structures, including one conventional section for control and three reinforced concrete structures on grade, one slab and two beam sections. The analysis and design of these latter structures was accomplished by means of the finite element method, NASTRAN, and is presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 99-110
    Format: application/pdf
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  • 17
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    The Philosophy which underlies the structural tests of a supersonic transport aircraft with particular attention to the thermal cycle (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The information presented is based on data obtained from the Concorde. Much of this data also applies to other supersonic transport aircraft. The design and development of the Concorde is a joint effort of the British and French, and the structural test program is shared, as are all the other activities. Vast numbers of small specimens have been tested to determine the behavior of the materials used in the aircraft. Major components of the aircraft structure, totalling almost a complete aircraft, have been made and are being tested to help the constructors in each country in the design and development of the structure. Tests on two complete airframes will give information for the certification of the aircraft. A static test was conducted in France and a fatigue test in the United Kingdom. Fail-safe tests are being made to demonstrate the crack-propagation characteristics of the structure and its residual strength. Aspects of the structural test program are described in some detail, dealing particularly with the problems associated with the thermal cycle. The biggest of these problems is the setting up of the fatigue test on the complete airframe; therefore, this is covered more extensively with a discussion about how the test time can be shortened and with a description of the practical aspects of the test.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center Advanced Approaches to Fatigue Evaluation te; p 1-91
    Format: application/pdf
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  • 18
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    Finite amplitude dynamic motion of viscoelastic materials. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: STRUCTURAL MECHANICS
    Type: Society of Rheology; vol. 16
    Format: text
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  • 19
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    Closed form solution to the semi-infinite cylindrical shell problem. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Reconsideration of the problem of a complete semiinfinite circular cylindrical shell with a square cage investigated earlier by Reissner and Simmonds (1966). It is shown that the solution can be found in closed form rather than in the form of Fourier series, provided that the boundary data on the end of the shell are 'slowly varying.'
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 20
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    Propagation of the transverse normal stress in a thick plate due to distributed lateral impulsive loadings (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A theoretical study of the elastic stresses produced in an infinite plate when struck by a high-speed object is presented. The solution is obtained by means of linear elasticity. Laplace transformation techniques are employed to solve the axisymmetric problem. The plate is loaded normal to its surface with a uniform load over a circular area. The normal stress at the wave front of the unreflected dilatation wave along the axis and its variation with the radius of loading are determined. Various facets of the problem are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-2568 , L-8043
    Format: application/pdf
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