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  • Other Sources  (8)
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  • 1
    facet.materialart.
    Unknown
    Experimental characterization of composites (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The experimental characterization for composite materials is generally more complicated than for ordinary homogeneous, isotropic materials because composites behave in a much more complex fashion, due to macroscopic anisotropic effects and lamination effects. Problems concerning the static uniaxial tension test for composite materials are considered along with approaches for conducting static uniaxial compression tests and static uniaxial bending tests. Studies of static shear properties are discussed, taking into account in-plane shear, twisting shear, and thickness shear. Attention is given to static multiaxial loading, systematized experimental programs for the complete characterization of static properties, and dynamic properties.
    Keywords: STRUCTURAL MECHANICS
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  • 2
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    Material damping - An introductory review of mathematical models, measures and experimental techniques. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 29; July 22
    Format: text
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  • 3
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    In-plane, flexural, twisting and thickness-shear coefficients for stiffness and damping of a monolayer filamentary composite, part 1 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Elastic and damping analyses resulting in determinations of the various stiffnesses and associated loss tangents for the complete characterization of the elastic and damping behavior of a monofilament composite layer are presented. For the determination of the various stiffnesses, either an elementary mechanics-of-materials formulation or a more rigorous mixed-boundary-value elasticity formulation is used. The solution for the latter formulation is obtained by means of the boundary-point least-square error technique. Kimball-Lovell type damping is assumed for each of the constituent materials. For determining the loss tangents associated with the various stiffnesses, either the viscoelastic correspondence principle or an energy analysis based on the appropriate elastic stress distribution is used.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-112141
    Format: application/pdf
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  • 4
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    Sinusoidal response of composite-material plates with material damping. (1973)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: A general forced-vibration analysis is presented for laminated anisotropic rectangular plates including material damping. The theory used is the laminated version of the Mindlin plate theory and includes thickness-shear flexibility and rotatory and coupling inertia. A solution is obtained by the Rayleigh-Ritz method, extended to include the energy dissipated and the work done by the excitation. The analysis is applied to prediction of the resonant frequencies and associated nodal patterns and damping ratios of the first five modes for a series of rectangular plates with free edges. The plates considered consist of unidirectional boron-fiber/epoxy composite material with respective fiber orientations of 0, 10, 30, 45, 60, and 90 deg.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-DET-120 , Design Engineering Technical Conference; Sept. 9-12, 1973; Cincinnati, OH
    Format: text
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  • 5
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    Analysis of twisting stiffness for a multifiber composite layer (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The twisting stiffness of a rectangular cross section consisting of a single row of solid circular cross-section fibers embedded in a matrix is analyzed. The problem is formulated as a Dirichlet torsion problem of a multielement region and solved by the boundary-point least-squares method. Numerical results for a single-fiber square cross section compare favorably with previous relaxation-method results. New numerical results for three and five-fiber composites suggest that the torsional rigidity of a multifiber composite can be approximated from the torsional rigidities of single and three-fiber models.
    Keywords: STRUCTURAL MECHANICS
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  • 6
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    Vibration and damping of laminated, composite-material plates including thickness-shear effects (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: An analytical investigation of sinusoidally forced vibration of laminated, anisotropic plates including bending-stretching coupling, thickness-shear flexibility, all three types of inertia effects, and material damping is presented. In the analysis the effects of thickness-shear deformation are considered by the use of a shear correction factor K, analogous to that used by Mindlin for homogeneous plates. Two entirely different approaches for calculating the thickness-shear factor for a laminate are presented. Numerical examples indicate that the value of K depends on the layer properties and the stacking sequence of the laminate.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-112140
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  • 7
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    Analysis of longitudinal thickness-shear stiffness of a monolayer filamentary composite (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The longitudinal thickness-shear behavior of a rectangular cross-section prism containing circular cross-section fibers embedded in a matrix is analyzed. The problem is formulated as a Saint-Venant flexure problem modeled by a tip-loaded cantilever composite beam and solution is obtained by the boundary-point least-squares method. It is shown that the longitudinal thickness-shear modulus is much greater than the in-plane shear modulus for a monofilament composite and therefore an independent analysis is necessary to predict the longitudinal thickness-shear behavior of the composite. Numerical results are presented in graphical form for various values of fiber volume fraction and material parameters typical of modern advanced composites.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 12; Oct. 197
    Format: text
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  • 8
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    Evaluation of experimental methods for determining dynamic stiffness and damping of composite materials (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Various methods potentially usable for determining dynamic stiffness and damping of composite materials are reviewed. Of these, the following most widely used techniques are singled out for more detailed discussion: free vibration, pulse propagation, and forced vibration response. To illustrate the usefulness and validity of dynamic property data, their application in dynamic analyses and comparison with measured structural response are described for the following composite-material structures: free-free sandwich beam with glass-epoxy facings, clamped-edge sandwich plate with similar facings, free-end sandwich conical shell with similar facings, and boron-epoxy free plate with layers arranged at various orientations.
    Keywords: MATERIALS, NONMETALLIC
    Type: Conference on Composite materials: Testing and design; Mar 21, 1973 - Mar 22, 1973; Williamsburg, VA
    Format: text
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