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  • STRUCTURAL MECHANICS  (7)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (2)
  • 1975-1979  (5)
  • 1970-1974  (4)
  • 1
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    Recent advances in thermal-structural analysis and design (1978)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-13
    Beschreibung: A continuing effort to develop a comprehensive capability for thermal-structural analysis and automated design (sizing) is reviewed. A principal role in the activity is played by the finite element program SPAR which contains both an efficient structural and thermal analysis capability. The benefit of having thermal and structural analyses in the same finite element program is illustrated by the application of SPAR to design calculations for the National Transonic Facility - a cryogenic wind tunnel under construction at Langley. Some experience with large-scale thermal structural analysis problems, particularly the space shuttle orbiter, has led to the identification of some analysis needs. Those needs include automated model generation and data output for lumped parameter thermal analysis, faster solution methods for nonlinear transient heat transfer, automated interpolation of temperature data from a thermal finite element model to a dissimilar structural finite model, and automated techniques to identify the times at which the critical combinations of transient heating and loads occur on a structure.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Recent Advan. in Structures for Hypersonic Flight, Pt.2; p 897-941
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Effect of out-of-planeness of membrane quadrilateral finite elements. (1973)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Investigation of the effect of using plane quadrilateral membrane elements for modeling nonplanar structures. The effect is assessed by analyzing a simplified finite element model with the aid of the structure network analysis program. The results obtained indicate that the use of planar quadrilateral membrane elements for modeling bending problems can lead to large errors if the four points that define the quadrilateral are not in the same plane.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA Journal; 11; May 1973
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Stress and buckling analysis of a double-bubble tank structure (1972)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: An analytical study of a two-lobed circular arc pressure vessel (double-bubble tank) with a local perturbation from the cylindrical shape was made. It can be concluded that NASTRAN provides a good linear buckling analysis capability for structures that cannot be handled by other analysis techniques. However, solutions are relatively expensive from a computational standpoint. Two worthwhile additions to the NASTRAN program would be the inclusion of a new beam element that adequately represents the shear transfer when modeling stiffeners on a shell and the capability, in a rigid format, to keep certain prescribed loads constant during the eigenvalue extraction process.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASTRAN: Users' Experiences; p 53-71
    Format: application/pdf
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  • 4
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    Charge distributions near metal-dielectric interfaces before and after dielectric surface flashover (1977)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A technique was developed for measuring surface charge distribution near interfaces without placing any measuring apparatus near the face of the samples. The results of measurements which were made on FEP Teflon and Kapton dielectrics, before and after are given flashover, with various types of interfaces. Also given are data showing mean time between flashovers for various configurations exposed to a variety of environmental conditions. Several charge transfer mechanisms are considered as a means by which stable charge distributions may be maintained near interfaces.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA. Lewis Res. Center Proc. of the Spacecraft Charging-Technol. Conf.; p 503-717
    Format: application/pdf
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  • 5
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    Analysis of a Hot Elevon Structure (1971)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-03
    Beschreibung: Comparison of ASKA and NASTRAN programs analyses of space shuttle hot elevon test article deformed under thermal and mechanical loads
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Langley Res. Center NASTRAN: Users Experiences; p 163-180
    Format: text
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  • 6
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    Evaluation of a hybrid, anisotropic, multilayered, quadrilateral finite element (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A multilayered finite element with bending-extensional coupling is evaluated for: (1) buckling of general laminated plates; (2) thermal stresses of laminated plates cured at elevated temperatures; (3) displacements of a bimetallic beam; and (4) displacement and stresses of a single-cell box beam with warped cover panels. Also, displacements and stresses for flat and spherical orthotropic and anisotropic segments are compared with results from higher order plate and shell finite-element analyses.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TP-1236 , L-12113
    Format: application/pdf
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  • 7
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    Simplified and refined finite element approaches for determining stresses and internal forces in geometrically nonlinear structural analysis (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Two methods for determining stresses and internal forces in geometrically nonlinear structural analysis are presented. The simplified approach uses the mid-deformed structural position to evaluate strains when rigid body rotation is present. The important feature of this approach is that it can easily be used with a general-purpose finite-element computer program. The refined approach uses element intrinsic or corotational coordinates and a geometric transformation to determine element strains from joint displacements. Results are presented which demonstrate the capabilities of these potentially useful approaches for geometrically nonlinear structural analysis.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA PAPER 79-0746 , Structures, Structural Dynamics, and Materials Conference; Apr 04, 1979 - Apr 06, 1979; St. Louis, MO
    Format: text
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  • 8
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    Surface charge kinetics near metal-dielectric interfaces exposed to kilovolt electron flux (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Interfaces between dielectric films and grounded metallic boundaries were exposed, in vacuum, to monoenergic electron fluxes having energies up to 22 keV. Two principal concerns were the measuring of the charge distributions on dielectrics and the determining of causes of flashovers, events where dielectric surface charges abruptly transfer to the metallic structures. Surface charges are perturbed within 10 mm of interfaces. Perturbations are relatively small except within about 3 mm of the interface. The probability of flashover was found to be related to microscopic imperfections in the interfaces. As flashovers occur in an exposed metal substrate, points become burned into the dielectric along the slit. As these points develop, the probability of flashover increases greatly. An interface which is highly immune to flashover was formed by covering a dielectric film with a 1.5-mm-thick aperture plate which exposes the film through a machined opening.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: NASA-CR-155195
    Format: application/pdf
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  • 9
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    An analytic study of radiatively cooled delta-wing structures for hypersonic aircraft (1971)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Aerodynamic heating and structural analyses for radiatively cooled delta wing of hypersonic aircraft
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TN-D-6138 , L-6666
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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