Topic
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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25 Sep 1997
TL;DR: In this paper, an uncured honeycomb core sandwich panel (27) is laid-up on a lay-up mandrel and an inner bagging film (28) is then extended over the uncured hull.
Abstract: A method of forming a caul plate (14) for use in producing a composite honeycomb core sandwich panel (27). The uncured honeycomb core sandwich panel (27) is laid-up on a lay-up mandrel (20). An inner bagging film (28) is then extended over the uncured honeycomb core sandwich panel (27). Tooling prepreg sheets (34) are extended over the inner bagging film (28), and a outer bagging film (40) is extended over the tooling prepreg sheets (34). Reduced vacuum is applied to the inner bagging film (28), and full vacuum is applied to the outer bagging film (40). The tooling prepreg sheets (34) are then partially cured so that they harden into the shape of the inner mold line of the honeycomb core sandwich panel (27). The partially cured tooling prepreg sheets (34) are then final cured to form the caul plate (14). The caul plate (14) can then be used for inner mold line tooling for the honeycomb core sandwich panel (27) or parts having the same inner mold line shape.
22 citations
TL;DR: In this article, a three point bending load arrangement was conducted to examine the static and fatigue performance of honeycomb sandwich panel. But the failure modes were not analyzed. And the failure was not due to face yielding, but due to delamination at core and skin interface.
22 citations
TL;DR: In this article, the energy absorption characteristics of aluminum sandwich panels with Shear Thickening Fluid (STF) filled 3D fabric cores were investigated under various loading conditions, and the 2Al-5STF specimen showed the highest absorbed energy (3.53 J).
Abstract: In this study, the energy absorption characteristics of aluminum sandwich panels with Shear Thickening Fluid (STF) filled 3D fabric cores was investigated under various loading conditions. The sandwich panel with 5-ply STF-filled 3D fabric (2Al-5STF) showed the highest absorbed energy (3.53 J) in three-point bending test. The 2Al-5STF specimen also demonstrated more resistance under ballistic impact loading than the sandwich panel with 5-ply neat 3D fabric (2Al-5Neat) such that with less average penetration depth presented the highest ballistic resistance. The dynamic compression test showed the STF helped to improve the impact absorption and compressive performance of the sandwich panels. The average peak force applied to the 2Al-5STF sandwich panel (30.5 kN) was 24.5 and 54.6% less than the 2AL-5Neat and 4Al specimens, respectively, and this sandwich panel demonstrated the highest impact absorption (peak force reduction). However, the 2Al-3STF specimen demonstrated the highest peak force reduction per unit areal density, and the 2Al-5Neat specimen demonstrated better reversibility.
22 citations
TL;DR: In this article, carbon-fiber-reinforced aluminum honeycomb, aramid and plywood materials were used for armor matrix layers for determining the capability of sequencing the composite layers, ballistic tests for all six combination of sequenced sandwich panels for three different composites were evaluated at a speed of 700 m/s using a 36 caliber one-cored projectile.
Abstract: Impact problems are usually interesting for the military, either for defensive or offensive purposes to develop armor or ammunition. Recently, daily applications request safety of the products, therefore, it is essential to understand the material behavior under intense short duration or impact loadings. Metallic armor is extremely heavy and would not be popular for personal protection. However, reinforced fiber composites have been used for these purposes. In present study, carbon-fiber-reinforced aluminum honeycomb, aramid and plywood materials were used for armor matrix layers. For determining the capability of sequencing the composite layers, ballistic tests for all six combination of sequenced sandwich panels for three different composites were evaluated at a speed of 700 m/s using a 36 caliber one-cored projectile. To obtain cheaper and reliable solutions for further studies of various test conditions, computer aided ballistic simulations were analyzed. To make sufficient correlations, the test results and the computer simulations were compared to each other. Finally, plywood used between the aramid and the carbon-fiber-reinforced aluminum honeycomb sandwich panel has shown the most accurate and the reliable results of the tests and the computer simulations.
22 citations
TL;DR: In this paper, the buckling of honeycomb sandwich panel of hexagonal cell has been carried out by considering simply supported boundary constraints explicitly, and the laminate element type has been considered for linear static analysis using Lanczos Method (finite element method).
Abstract: In the present work, an avant-garde study on Buckling of honeycomb sandwich panel of hexagonal cell has been carried out by considering simply supported boundary constraints explicitly. A novel theoretical formulation has been developed for the buckling of honeycomb panel as per Mil Standard (MIL-HDBK-23A). The laminate element type has been considered for linear static analysis using Lanczos Method (finite element method (FEM)). The buckling analysis carried out by FEM has been compared and validated with theoretical and experimental investigation for different panel aspect ratio under static load.
21 citations