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Article

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

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. https://doi.org/10.3390/ma12060874

AMA Style

Ha GX, Zehn MW, Marinkovic D, Fragassa C. Dealing with Nap-Core Sandwich Composites: How to Predict the Effect of Symmetry. Materials. 2019; 12(6):874. https://doi.org/10.3390/ma12060874

Chicago/Turabian Style

Ha, Giap X., Manfred W. Zehn, Dragan Marinkovic, and Cristiano Fragassa. 2019. "Dealing with Nap-Core Sandwich Composites: How to Predict the Effect of Symmetry" Materials 12, no. 6: 874. https://doi.org/10.3390/ma12060874

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