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Sandwich panel

About: Sandwich panel is a research topic. Over the lifetime, 4665 publications have been published within this topic receiving 49812 citations.


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Patent
L Niebylski1
21 Jun 1971
TL;DR: A COMPOSITE SANDWICH PANEL CONSTRUCTION as discussed by the authors has two outer layers attached to OPPOSITE sides of the same CORE, with Z-shaping REINFORCING.
Abstract: A COMPOSITE SANDWICH PANEL TYPE CONSTRUCTION COMPRISING TWO INDEPENDENT OUTER LAYERS ATTACHED TO OPPOSITE SIDES OF FOAMED METAL CORE, SAID CORE HAVING Z-SHAPED REINFORCING ELEMENTS THEREIN. A PREFERRED PANEL CONSTRUCTION HAS ONE OUTER LAYER EXTENDING AROUND SAID FOAMED METAL CORE SO AS TO SUBSTATALLY ENCASE SAID CORE, METHODS OF FABRICATING SUCH A PANEL CONSTRUCTION (1) BY CASTING SAID FOAMED ALUMINUM AROUND SAID REINFORCING ELEMENTS AND SUBSEQUENTLY ATTACHING SAID OUTER LAYERS TO THIS INTERAL METAL FOAM/REINFORCING ELEMENT CORE STRUCTURE, AND (2) BY FIRST PREPARING SAID CORE FROM INDIVIDUAL METAL FOAM PIECES WHICH ARE THEN ATTACHED TO PERFORMED Z-SHAPED REINFORCING ELEMENTS, SAID ASSEMBLED CORE STRUCTURE THEN HAVING THE OUTER LAYERS ATTACHED THERETO. COMPARED TO THE COMPOSITE SANDWICH PANEL CONSTRUCTION HAVING NO Z-SHAPED REINFORCING ELEMENTS IN SAID CORE, THE PRESENT CONSTRUCTION HAS SUBSTANTIALLY IMPROVED STRENGTH.

16 citations

Journal ArticleDOI
TL;DR: In this article, an energy-balance-based analytical method and finite element (FE) simulations were developed to study the dynamic response of metallic sandwich panels subject to blast loadings, and the analytical model can be used to predict approximately the deflection of the panels, while the FE model can take into account fluid-structure interactions and the effect of strain rate.
Abstract: An energy-balance-based analytical method and finite element (FE) simulations were developed in this paper to study the dynamic response of metallic sandwich panels subject to blast loadings. The analytical model can be used to predict approximately the deflection of the panels, while the FE model can take into account fluid–structure interactions and the effect of strain rate. Both models were validated by comparing their predictions with the test results available in the literature. Parametric studies were then carried out to assess various factors that are influential in characterizing the dynamic behavior of sandwich panels subject to blast loads.

16 citations

Journal ArticleDOI
TL;DR: In this article, a textile core sandwich structure is investigated with respect to their ability to absorb transverse compressive load, and experimental observations are compared to numerical simulations for cores made from precrimped woven wire cloth laminated together via transient liquid phase bonding.
Abstract: A class of textile core sandwich structure is investigated with respect to their ability to absorb transverse compressive load. To this end, experimental observations are compared to numerical simulations for cores made from precrimped woven wire cloth laminated together via transient liquid-phase bonding. The experimental observations show that this structure exhibits key properties for being a promising load-absorbing structure, for example, impact and blast protection. Matching numerical simulations show that the behavior can be captured with simulations and that a relatively simplified scheme can be used. The simulations also suggest sensitivity to the local topology in absorbing energy, as well as explaining the somewhat unexpected deformation behavior observed experimentally. Multifunctionality, owing to the accessible open space between cells, coupled with attractive compressive behavior is achieved. Nomenclature d = diameter of the truss (wire diameter) E = Young’s modulus of the material comprising the trusses G c = shear modulus of the truss core R = radius of the truss, d/2 r = radius of the connecting element in the woven structure w = opening width (distance between wires) ¯ ρcore = relative density of the truss core σY = yield strength of the material comprising the trusses σ c Y = compressive strength of the truss core τ c Y = shear strength of the truss core

16 citations

Journal ArticleDOI
TL;DR: In this article, a degenerated isoparametric multilayer finite element is described in conjunction with an automatic incremental/iterative method to find the complete nonlinear response of arbitrarily laminated composite and sandwich panels under destabilizing loads.
Abstract: A three-dimensional degenerated isoparametric multilayer finite element is described in conjunction with an automatic incremental/iterative method to find the complete nonlinear response of arbitrarily laminated composite and sandwich panels under destabilizing loads. The case of thick sandwich panels is investigated by comparing three different models: 1) a high-order, multilayer shell element, 2) a multilayer shell element with null transverse shear moduli in the skins layers, and 3) a superposition of multilayer isoparametric membranes for the skins, and a volume element for the core. All these models allow the accurate representation of the cross-section warping in thick shear deformable sandwich panels and, after some validation tests, the model (3) is found to be the most efficient. In the prebuckling range of the structural response, incremental bifurcation analyses are combined with an arc-length algorithm to control the step size; for the postbuckling path, the increment size is determined automatically by a new recurrence formula. The good behavior of this proposed procedure is illustrated on two structural postbuckling applications, namely, a highly curved cylindrical composite panel and a sandwich panel with flange edges both subjected to in-plane compression.

16 citations

Journal ArticleDOI
TL;DR: In this article, the structure of a foam-filled corrugated core sandwich panel is optimized. Failure modes under consideration are the overall and local instability of the panel, and additional constraint related to the effective thermal conductivity is incorporated.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202384
2022217
2021244
2020280
2019264
2018252