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Static and dynamic analysis of soft core sandwich panels with through-thickness deformation

Title
Static and dynamic analysis of soft core sandwich panels with through-thickness deformation
Type
Article in International Scientific Journal
Year
2010
Authors
R.A.S. Moreira
(Author)
Other
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J. Dias Rodrigues
(Author)
FEUP
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Journal
Title: Composite StructuresImported from Authenticus Search for Journal Publications
Vol. 92 No. 2
Pages: 201-215
ISSN: 0263-8223
Publisher: Elsevier
Indexing
Scientific classification
FOS: Engineering and technology > Mechanical engineering
Other information
Authenticus ID: P-003-AFD
Abstract (EN): Sandwich plates represent an efficient structural element, providing a high stiffness/weight ratio characteristic. Moreover, when using this structural element, different design configurations and materials in the core can be adopted in order to obtain desired properties. From high dissipation elastomers to light and stiff honeycombs, several core materials may be applied, looking for high damping ratios or simply to obtain an high flexural stiffness/weight ratio. Despite the huge interest on the sandwich structures, its numerical modeling requires special attention in the representation of the skin/core interrelation. This aspect assumes an important role when dealing with soft cores. In fact, regardless the difficulties arising from the high skin/core modulus ratio, which requires a representative displacement field descriptor, the numerical model should take into consideration the permissible deformation along the thickness direction to which the core may be submitted to. Currently, the modeling of such behavior requires the application of layerwise models accomplishing for a complete 3D spatial field description, which lead usually to a high computational cost during the simulation of sandwich panels. In this paper, to trim down the computational cost, it is proposed a simple and cost-effective layerwise model based on a two-dimensional displacement field descriptor. This finite element is formulated using a plate finite element to represent the in-plane and out-plane deformation field of each layer, and a set of bar finite elements to describe the stiffness related to the nodal normal displacement degree-of-freedom. The proposed finite element formulation and numerical implementation are assessed by comparison with results obtained from other modeling methodologies. Furthermore, the finite element model is also validated through the correlation analysis between the numerical results and the experimental data obtained from a dynamic analysis conducted on representative specimens.
Language: English
Type (Professor's evaluation): Scientific
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