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  • STRUCTURAL MECHANICS  (239)
  • 2020-2022
  • 1970-1974  (239)
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  • 1
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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
  • 2
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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
    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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    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
  • 5
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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
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    NASTRAN as Analysis Tool in a Structural Design Optimization Process (1971)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-03
    Beschreibung: Use of NASTRAN as analysis tool in structural design optimization process applied to aircraft fuselage type structure
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASTRAN: Users Experiences; p 465-478
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Coupling between structure and liquids in a parallel stage space shuttle design (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A study was conducted to determine the influence of liquid propellants on the dynamic loads for space shuttle vehicles. A parallel-stage configuration model was designed and tested to determine the influence of liquid propellants on coupled natural modes. A forty degree-of-freedom analytical model was also developed for predicting these modes. Currently available analytical models were used to represent the liquid contributions, even though coupled longitudinal and lateral motions are present in such a complex structure. Agreement between the results was found in the lower few modes.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-127631 , AIAA PAPER 72-347-REV
    Format: application/pdf
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  • 8
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    Multimaterial lamination as a means of retarding penetration and spallation failures in plates (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Experimental data are presented which show that hypervelocity impact spallation and penetration failures of a single solid aluminum plate and of a solid aluminum plate spaced a distance behind a Whipple meteor bumper may be retarded by replacing the solid aluminum plate with a laminated plate. Four sets of experiments were conducted. The first set of experiments was conducted with projectile mass and velocity held constant and with polycarbonate cylinders impacted into single plates of different construction. The second set of experiments was done with single plates of various construction and aluminum spherical projectiles of similar mass but different velocities. These two experiments showed that a laminated plate of aluminum and polycarbonate or aluminum and methyl methacrylate could prevent spallation and penetration failures with a lower areal density than either an all-aluminum laminated plate or a solid aluminum plate. The aluminum laminated plate was in turn superior to the solid aluminum plate in resisting spallation and penetration failures. In addition, through an example of 6061-T6 aluminum and methyl methacrylate, it is shown that a laminated structure ballistically superior to its parent materials may be built. The last two sets of experiments were conducted using bumper-protected main walls of solid aluminum and of laminated aluminum and polycarbonate. Again, under hypervelocity impact conditions, the laminated main walls were superior to the solid aluminum main walls in retarding spallation and penetration failures.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TN-D-6989 , L-8444
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Shock transmission in coupled beams and rib stiffened structures (1971)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Shock transmission in a simple coupled beam structure and in a ring-stringer stiffened cylinder is investigated experimentally and analytically using wave transmission and statistical energy analysis concepts. The use of the response spectrum to characterize the excitation provided to a simple beam by a force pulse is studied. Analysis of the transmission of a dilatation wave in a periodically stiffened plate indicates that the stiffeners are fairly transparent to the wave, but some of the dilatational energy is scattered into bending at each support.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-121042 , REPT-2091
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Buckling of circular cylindrical shells having axisymmetric imperfection distributions (1971)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Buckling of circular cylindrical shells with axisymmetric imperfection distributions under axial compression
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: ; TROPHYSICAL JOURNAL
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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