Topic
Sandwich-structured composite
About: Sandwich-structured composite is a research topic. Over the lifetime, 5853 publications have been published within this topic receiving 101126 citations.
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TL;DR: The impact resistance of sandwich panels with [±45/0] s Hercules AS4/3501-6 graphite/epoxy face-sheets manufactured with different types of cores (aluminum honeycomb, Nomex honeycomb and Rohacell plastic foam with three different core thicknesses, 3.2 mm, 6.4 mm and 9.6 mm) was studied at low energy levels.
Abstract: The impact resistance of sandwich panels with [±45/0] s Hercules AS4/3501-6 graphite/epoxy face-sheets manufactured with different types of cores (aluminum honeycomb, Nomex honeycomb and Rohacell plastic foam with three different core thicknesses, 3.2 mm, 6.4 mm and 9.6 mm) was studied at low energy levels (less than 10 joules). X-ray photos were taken to determine the extent of delamination damage, and the panels were sectioned so the location and lengths of delaminations, debonds, and core damage could be determined
94 citations
TL;DR: In this article, the dynamic out-of-plane compressive response of stainless steel corrugated and Y-frame sandwich cores was investigated for impact velocities ranging from quasi-static to 200 ms � 1.
94 citations
TL;DR: The application of the method is seen to be straightforward even in the complicated case of laminated sandwich panels, and accurate predictions of the dispersion curves are found at negligible computational cost.
Abstract: This paper describes a wave finite element method for the numerical prediction of wave characteristics of cylindrical and curved panels. The method combines conventional finite elements and the theory of wave propagation in periodic structures. The mass and stiffness matrices of a small segment of the structure, which is typically modeled using either a single shell element or, especially for laminated structures, a stack of solid elements meshed through the cross-section, are postprocessed using periodicity conditions. The matrices are typically found using a commercial FE package. The solutions of the resulting eigenproblem provide the frequency evolution of the wavenumber and the wave modes. For cylindrical geometries, the circumferential order of the wave can be specified in order to define the phase change that a wave experiences as it propagates across the element in the circumferential direction. The method is described and illustrated by application to cylinders and curved panels of different constructions. These include isotropic, orthotropic, and laminated sandwich constructions. The application of the method is seen to be straightforward even in the complicated case of laminated sandwich panels. Accurate predictions of the dispersion curves are found at negligible computational cost.
93 citations
TL;DR: In this article, an innovative aluminum sandwich panel with sinusoidal corrugated core is investigated and the properties of the equivalent material are determined both analytically and numerically for the chosen Reissner-Mindlin orthotropic representation.
93 citations
Patent•
27 Feb 1981TL;DR: A composite structure has two composite panels which are bonded together at a joint as discussed by the authors, and the joint is reinforced by composite thread being sewn in a series of stitches through the panels.
Abstract: A composite structure has two composite panels which are bonded together at a joint. The joint is reinforced by composite thread being sewn in a series of stitches through the panels. Sewing the panels while they are in a staged condition allows the structure to be co-cured as assembled.
93 citations