Sandwich structures with repairable cores based on truncated cube cells

Hedayati, R, Yousefi, A ORCID: https://orcid.org/0000-0001-7478-7991 and Bodaghi, M ORCID: https://orcid.org/0000-0002-0707-944X, 2022. Sandwich structures with repairable cores based on truncated cube cells. Composites Part B: Engineering, 243: 110124. ISSN 1359-8368

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Abstract

With dramatic increase in 3D printing applications in industry, sandwich panels with 3D printed cores have gained a lot of attention recently. In harmony with global movement towards sustainability and low-carbon emission industries, sandwich panels with easy-to-repair and cost-effective cores would be very attractive structures. In this regard, implementing separated cells for constructing lattice structures instead of using back-to-back lattice structures makes repairing local damages in the core easier and more cost-effective. Ideally, a damaged cell can be replaced with an intact new cell without the need to change the whole core structure. In this study, mechanical responses of a single truncated cube unit cell, a well-known geometry for constructing regular lattices has been studied analytically, numerically, and experimentally. Analytical relationships were derived for stiffness, yield stress, and Poisson's ratio of a single unit cell. Samples were 3D printed and tested mechanically in large deformation regime. A good agreement between results from analytical derivations, numerical simulations, and experiments was observed. It was shown that an equilateral truncated cube structure has a yield stress at least twice of that for a simple cube structure. Three types of repairable sandwich panels with different uniform core densities as well as four graded cores were studied as well. The functionally graded sandwich panels presented the best performance while considering both energy absorption capacity and mass. The best functionally graded sandwich panels (Type 4) showed an increase in specific energy absorption (SEA) by almost 21% and a decrease in maximum displacement by 2.5% with respect to the second-ranking best option.

Item Type:	Journal article
Publication Title:	Composites Part B: Engineering
Creators:	Hedayati, R., Yousefi, A. and Bodaghi, M.
Publisher:	Elsevier BV
Date:	15 August 2022
Volume:	243
ISSN:	1359-8368
Identifiers:	Number Type 10.1016/j.compositesb.2022.110124 DOI S1359836822005005 Publisher Item Identifier 1566311 Other
Rights:	© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	19 Jul 2022 10:53
Last Modified:	19 Jul 2022 10:53
URI:	https://irep.ntu.ac.uk/id/eprint/46639

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