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  • 1
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    Three-dimensional solutions for thermomechanical stresses in sandwich panels and shells (1995)
    In:  Other Sources
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    Publication Date: 2019-01-25
    Description: Analytic three-dimensional thermoelasticity solutions are presented for static problems of simply supported sandwich panels and cylindrical shells subjected to mechanical and thermal loads. The panels and shells have laminated composite face sheets of arbitrary thickness separated by a core. Each of the individual layers of the face sheets and the core is modeled as a three-dimensional continuum. Analytic first-order sensitivity coefficients are evaluated to assess the sensitivity of the responses to variations in material parameters of the face sheets and the core, as well as to variations in the curvatures and thicknesses of the sandwich and face sheets. Also, the strain energy associated with various stress components in the face sheets and core are calculated and compared. The information obtained in the present study can aid the development and assessment of two-dimensional models for sandwich structures and illuminate the role of particular material parameters in an equivalent model for the core.
    Keywords: STRUCTURAL MECHANICS
    Type: Center for Computational Structures Technology; 1 p
    Format: text
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  • 2
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    Theoretical and experimental treatment of fracture in an adhesive interlayer (1971)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Elastic adhesive interlayer effect on bond fracture strength, considering propellant-liner- steel combination in solid rocket motors
    Keywords: STRUCTURAL MECHANICS
    Type: ; 121- 147. (
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  • 3
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    Master agreement task order 2 - Analyses and limited evaluations of payload and landing system structures for the survivable soft landing of instrument payloads (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Computer programs for analysis and evaluation of payload and landing system structures for soft landing of instrument packages
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-66914
    Format: application/pdf
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  • 4
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    Stress and free vibration analyses of multilayered composite plates (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: This paper presents a two-phase computational procedure for the accurate prediction of vibration frequencies, stresses, and deformations in simply supported bidirectional multilayered composite plates. The range of applicability of this procedure in terms of the plate's parameters is determined, and the potential of the proposed procedure for use in conjunction with large-scale finite element modeling of composite structures is discussed. It is shown that the use of the shear correction factors calculated by this procedure extends the range of the validity of the first-order shear deformation theory, used in the first phase of the procedure, to fairly thick multilayered plates with the h/L1 ratio of the order of 0.3.
    Keywords: STRUCTURAL MECHANICS
    Type: Composite Structures (ISSN 0263-8223); 11; 3 19
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  • 5
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    Three-dimensional solutions for the free vibrations and buckling of thermally stressed multilayered angle-ply composite plates (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Analytic three-dimensional elasticity solutions are developed for the free vibration and buckling of thermally stressed rectangular multilayered angle-ply anisotropic plates which are assumed to have an antisymmetric lamination with respect to the middle plane. Sensitivity derivatives are evaluated and used to investigate the sensitivity of the vibration and buckling responses to variations in the different lamination and material parameters of the plate. A Duhamel-Neumann-type constitutive model is used, and the material properties are assumed to be independent of temperature. Numerical results are presented, showing the effects of variations in the material characteristics and fiber orientation of different layers, as well as the effect of initial thermal deformation on the vibrational and buckling responses of the plate.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME, Transactions, Journal of Applied Mechanics (ISSN 0021-8936); 59; 4; p. 868-877.
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  • 6
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    Three-dimensional solutions for the thermal buckling and sensitivity derivatives of temperature-sensitive multilayered angle-ply plates (1992)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Analytic three-dimensional thermoelasticity solutions are presented for the thermal buckling of multilayered angle-ply composite plates with temperature-dependent thermoelastic properties. Both the critical temperatures and the sensitivity derivatives are computed. The sensitivity derivatives measure the sensitivity of the buckling response to variations in the different lamination and material parameters of the plate. The plates are assumed to have rectangular geometry and an antisymmetric lamination with respect to the middle plane. The temperature is assumed to be independent of the surface coordinates, but has an arbitrary symmetric variation through the thickness of the plate. The prebuckling deformations are accounted for. Numerical results are presented, for plates subjected to uniform temperature increase, showing the effects of temperature-dependent material properties on the prebuckling stresses, critical temperatures, and their sensitivity derivatives.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 92-WA/APM-2 , ASME, Transactions, Journal of Applied Mechanics (ISSN 0021-8936); 59; 4; p. 848-856.
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  • 7
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    Predictor-corrector procedures for thermal buckling analysis of multilayered composite plates (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A study is made of two predictor-corrector procedures for the accurate determination of global, as well as detailed, thermal buckling response characteristics of composite plates. Both procedures use first-order shear deformation theory in the predictor phase, but differ in the elements of the computational model being adjusted in the corrector phase. The first procedure calculates a posteriori estimates of the composite correction factors and uses them to adjust the transverse shear stiffnesses of the plate. The second procedure calculates a posteriori the functional dependence of the displacement components on the thickness coordinate. The corrected quantities are then used in conjunction with three-dimensional equations to obtain better estimates for the different response quantities. Extensive numerical results are presented, showing the effects of variation in the geometric and lamination parameters for antisymmetrically laminated composite plates subjected to uniform temperature rise, on the accuracy of the thermal buckling response obtained by predictor-corrector procedures.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 40; 5 19
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  • 8
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    Three-dimensional solutions for antisymmetrically laminated anisotropic plates (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Analytic three-dimensional elasticity solutions are presented for the stress and free vibration problems of multilayered anisotropic plates. The plates are assumed to have rectangular geometry and antisymmetric lamination with respect to the middle plane. A mixed formulation is used with the fundamental unknowns consisting of the six stress components and the three displacement components of the plate. Each of the plate variables is decomposed into symmetric and antisymmetric components in the thickness direction, and is expressed in terms of a double Fourier series in the Cartesian surface coordinates. Extensive numerical results are presented showing the effects of variation in the lamination and geometric parameters of composite plates on the importance of the transverse stress and strain components.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 89-WA/APM-39 , ASME, Transactions, Journal of Applied Mechanics (ISSN 0021-8936); 57; 182-188
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  • 9
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    Assessment of computational models for multilayered anisotropic plates (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The accuracy of the static and vibrational responses of multilayer anisotropic plates, predicted by eight modeling approaches based on two-dimensional shear-deformation theories, was investigated as a function of the lamination and geometric parameters of the shells. The models used included two-dimensional global approximation models, two-dimensional discrete-layer models, and predictor-corrector models. It is shown that the accuracy of the stress and vibrational responses predicted by the different models is strongly dependent on the significance of the transverse shear deformations.
    Keywords: STRUCTURAL MECHANICS
    Type: Composite Structures (ISSN 0263-8223); 14; 3 19
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  • 10
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    Assessment of computational models for multilayered composite shells (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A review is made of the different approaches used for modeling multilayered composite shells. Discussion focuses on different approaches for developing two-dimensional shear deformation theories; classification of two-dimensional theories based on introducing plausible displacement, strain and/or stress assumptions in the thickness direction; first-order shear deformation theories based on linear displacement assumptions in the thickness coordinate; and efficient computational strategies for anisotropic composite shells. Extensive numerical results are presented showing the effects of variation in the lamination and geometric parameters of simply supported composite cylinders on the accuracy of the static and vibrational responses predicted by eight different modeling approaches (based on two-dimensional shear deformation theories).
    Keywords: STRUCTURAL MECHANICS
    Type: Applied Mechanics Reviews (ISSN 0003-6900); 43; 67-97
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