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Journal ArticleDOI

Natural frequency analysis of a sandwich panel with soft core based on a refined shear deformation model

TL;DR: In this paper, the natural frequency of a thick rectangular sandwich panel composed of orthotropic facesheets and a soft core was studied based on a refined shear deformation model, and the effect of transverse shear modulus on flexural vibration of the panel was investigated.
About: This article is published in Composite Structures.The article was published on 2006-03-01. It has received 13 citations till now. The article focuses on the topics: Sandwich panel & Simple shear.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a generalized global-local theory that guarantees the continuity condition of all of the displacement and transverse stress components and considers the transverse flexibility under thermo-mechanical loads is introduced.

93 citations

Journal ArticleDOI
TL;DR: A generalized high-order global-local theory that satisfies all the kinematic and transverse stress continuity conditions at the interfaces of the layers, is proposed to investigate dynamic buckling of imperfect sandwich plates subjected to thermo-mechanical loads.

64 citations

Journal ArticleDOI
TL;DR: In this article, an easy-to-implement method to measure relevant elastic and damping properties of the constituents of a sandwich structure, possibly with a heterogeneous core, is proposed.

24 citations


Cites background from "Natural frequency analysis of a san..."

  • ...08 [42]....

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  • ...2 and corresponds to the writing “2h” in [42])....

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  • ...As pointed out by references [41–43], the accuracy of the thick-plate model to describe the dynamics of sandwich plates having a soft core depends mainly on the thickness to length ratio and on the skins Young modulus to core shear modulus ratio: Ex,y Gyz,xz ....

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Journal ArticleDOI
TL;DR: In this article, foam-filled honeycomb sandwich panels have been proposed in order to benefit from mechanical characteristics of both honeycomb cellular structure and polymeric foam in the core of the sandwich panel.
Abstract: Honeycomb structures are widely used in transportation industries. Owing to their lightweight, high strength, damage tolerance and thermal resistance, they are extensively used as a solution to modern engineering problems in the vehicle structure’s design. Furthermore, lightweight polymeric foams can be exploited to improve mechanical properties of sandwich panels. Recently, foam filled honeycomb sandwich panels have been proposed in order to benefit from mechanical characteristics of both honeycomb cellular structure and polymeric foam in the core of the sandwich panel. Until now, most of the investigations were delved into the mechanical properties of the foam filled honeycomb sandwich panels; in plane crushing, out of plane impact and local indentation response of these panels were broadly discussed previously. On the other hand, since many vehicles’ failure are related to severe vibrations, clear understanding of foam filled honeycomb panels eigenvibration properties is vital. In this paper, v...

21 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of the panel dimensions, elastic properties and densities of the facings, and core on the fundamental frequency have been studied using the numerical solution, analytical approach, and finite element analysis.
Abstract: The magnitude of the first natural frequency is often used as a criterion of the design efficiency of sandwich panels. The vibrations of fully clamped sandwich plate are analyzed using Galerkin method. The effects of the panel dimensions, elastic properties and densities of the facings, and core on the fundamental frequency have been studied using the numerical solution, analytical approach, and finite element analysis. It follows from the analysis that the first natural frequency can be calculated with sufficient accuracy on the basis of the analytical solution developed in this work.

19 citations


Cites methods from "Natural frequency analysis of a san..."

  • ...Liu and Zhao [15] presented results of calculations of natural frequencies for sandwich panels based on the use of theory of thick plates....

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  • ...Liu and Zhao [23] investigated effect of core compliancy on flexural vibrations of sandwich plates....

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  • ...A refined shear deformation model was employed by Liu and Zhao [21] for the frequency analysis of the sandwich panel with soft compliant core....

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References
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Journal ArticleDOI
J. N. Reddy1
TL;DR: In this paper, a higher-order shear deformation theory of laminated composite plates is developed, which accounts for parabolic distribution of the transverse shear strains through the thickness of the plate.
Abstract: A higher-order shear deformation theory of laminated composite plates is developed. The theory contains the same dependent unknowns as in the first-order shear deformation theory of Whitney and Pagano (1970), but accounts for parabolic distribution of the transverse shear strains through the thickness of the plate. Exact closed-form solutions of symmetric cross-ply laminates are obtained and the results are compared with three-dimensional elasticity solutions and first-order shear deformation theory solutions. The present theory predicts the deflections and stresses more accurately when compared to the first-order theory.

3,504 citations

Journal ArticleDOI
TL;DR: A review of computational models for sandwich plates and shells, predictor-corrector procedures, and the sensitivity of the sandwich response to variations in the different geometric and material parameters can be found in this article.
Abstract: The focus of this review is on the hierarchy of computational models for sandwich plates and shells, predictor-corrector procedures, and the sensitivity of the sandwich response to variations in the different geometric and material parameters. The literature reviewed is devoted to the following application areas: heat transfer problems; thermal and mechanical stresses (including boundary layer and edge stresses); free vibrations and damping; transient dynamic response; bifurcation buckling, local buckling, face-sheet wrinkling and core crimping; large deflection and postbuckling problems; effects of discontinuities (eg, cutouts and stiffeners), and geometric changes (eg, tapered thickness); damage and failure of sandwich structures; experimental studies; optimization and design studies. Over 800 relevant references are cited in this review, and another 559 references are included in a supplemental bibliography for completeness. Extensive numerical results are presented for thermally stressed sandwich panels with composite face sheets showing the effects of variation in their geometric and material parameters on the accuracy of the free vibration response, and the sensitivity coefficients predicted by eight different modeling approaches (based on two-dimensional theories). The standard of comparison is taken to be the analytic three-dimensional thermoelasticity solutions. Some future directions for research on the modeling of sandwich plates and shells are outlined.

740 citations

Journal ArticleDOI
TL;DR: A review of the different approaches used for modeling multilayered composite plates is given in this paper, where the effects of variation in the lamination and geometric parameters of simply supported composite plates on the accuracy of the static and vibrational responses predicted by six different modeling approaches (based on 2D shear deformation theories).
Abstract: A review is made of the different approaches used for modeling multilayered composite plates. 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; and first-order shear deformation theories based on linear displacement assumptions in the thickness coordinate. Extensive numerical results are presented showing the effects of variation in the lamination and geometric parameters of simply supported composite plates on the accuracy of the static and vibrational responses predicted by six different modeling approaches (based on two-dimensional shear deformation theories). The standard of comparison is taken to be the exact three-dimensional elasticity solutions. Some of the future directions for research on the modeling of multilayered composite plates are outlined.

686 citations

Journal ArticleDOI
TL;DR: In this paper, a simple isoparametric finite element formulation based on a higher-order displacement model for flexure analysis of multilayer symmetric sandwich plates is presented, which accounts for non-linear variation of inplane displacements and constant variation of transverse displacement through the plate thickness.

242 citations