Next Article in Journal
Memristor-CMOS Hybrid Circuit for Temporal-Pooling of Sensory and Hippocampal Responses of Cortical Neurons
Previous Article in Journal
Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity
Article Menu

Export Article

Open AccessArticle
Materials 2019, 12(6), 874;

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

Department of Structural Mechanics, Institute of Mechanics, Technical University of Berlin, 10623 Berlin, Germany
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)
Full-Text   |   PDF [3635 KB, uploaded 20 March 2019]   |  


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

Figure 1

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).

Share & Cite This Article

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top