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Materials 2019, 12(6), 874; https://doi.org/10.3390/ma12060874

Dealing with Nap-Core Sandwich Composites: How to Predict the Effect of Symmetry

1
Department of Structural Mechanics, Institute of Mechanics, Technical University of Berlin, 10623 Berlin, Germany
2
Department of Industrial Engineering, University of Bologna, 40136 Bologna, Italy
*
Author to whom correspondence should be addressed.
Received: 20 February 2019 / Revised: 10 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Recent Advances in Cellular Materials)
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Abstract

The behavior of nap-core sandwiches was investigated with a special focus on the effect of symmetry in nap cores. A nap-core is, in general terms, a 3D-formed hollow structure made of knitted textile impregnated by a thermosetting resin. The molding process determines if the nap-core is double-sided (symmetric) or single-sided. The sandwich with nap-core owns various remarkable properties of a novel lightweight material, but the nap-core’s complex structure makes the prediction of these properties a difficult task. While the analysis of a single-sided nap-core sandwich has been presented by the authors before, this study is focused on the simulation of symmetric nap-core sandwich. Overall, performance of the structure is examined with respect to several loading conditions. The simulation approach invokes a typical homogenization scheme to find the engineering properties of the nap-core’s fabric with least computational time and memory resources. Results from experiments and simulations exhibit a good compatibility, which prove the fitness of the modeling method. View Full-Text
Keywords: textiles; material layers; composite properties; symmetry; numerical models textiles; material layers; composite properties; symmetry; numerical models
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ha, G.X.; Zehn, M.W.; Marinkovic, D.; Fragassa, C. Dealing with Nap-Core Sandwich Composites: How to Predict the Effect of Symmetry. Materials 2019, 12, 874.

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