Journal
COMPOSITES PART B-ENGINEERING
Volume 59, Issue -, Pages 33-42Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2013.10.084
Keywords
Honeycomb; Mechanical properties; Impact behavior; Assembly
Funding
- UK Royal Society [RG2625]
- UK Engineering and Physical Sciences Research Council (EPSRC) through the ACCIS Doctoral Training Centre in Composites
- European Commission [NMP4-LA-2010-246067-]
- Chinese Scholarship Council
- Engineering and Physical Sciences Research Council [1102922] Funding Source: researchfish
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The work describes the manufacturing and testing of graded conventional/auxetic honeycomb cores. The graded honeycombs are manufactured using Kevlar woven fabric/914 epoxy prepreg using Kirigami techniques, which consist in a combination of Origami and ply-cut processes. The cores are used to manufacture sandwich panels for flatwise compression and edgewise loading. The compressive modulus and compressive strength of stabilized (sandwich) honeycombs are found to be higher than those of bare honeycombs, and with density-averaged properties enhanced compared to other sandwich panels offered in the market place. The modulus and strength of graded sandwich panel under quasi-static edgewise loading vary with different failure mode mechanisms, and offer also improvements towards available panels from open literature. Edgewise impact loading shows a strong directionality of the mechanical response. When the indenter impacts the auxetic portion of the graded core, the strong localization of the damage due to the negative Poisson's ratio effect contains significantly the maximum dynamic displacement of the sandwich panel. (C) 2013 Elsevier Ltd. All rights reserved.
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