Tunable energy absorption characteristics of architected honeycombs enabled via additive manufacturing

Kumar, S. , Ubaid, J., Abishera, R., Schiffer, A. and Deshpande, V.S. (2019) Tunable energy absorption characteristics of architected honeycombs enabled via additive manufacturing. ACS Applied Materials and Interfaces, 11(45), pp. 42549-42560. (doi: 10.1021/acsami.9b12880)

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Tailoring of material architectures in three-dimensions enabled by additive manufacturing (AM) offers the potential to realize bulk materials with unprecedented properties optimized for location-specific structural and/or functional requirements. Here we report tunable energy absorption characteristics of architected honeycombs enabled via material jetting AM. We realize spatially tailored 3D printed honeycombs (guided by FE studies) by varying the cell wall thickness gradient and evaluate experimentally and numerically the energy absorption characteristics. The measured response of architected honeycombs characterized by local buckling (wrinkling) and progressive failure reveals over 110% increase in specific energy absorption (SEA) with a concomitant energy absorption efficiency of 65%. Design maps are presented that demarcate the regime over which geometric tailoring mitigates deleterious global buckling and collapse. Our analysis indicates that an energy absorption efficiency as high as 90% can be achieved for architected honeycombs, whereas the efficiency of competing microarchitected metamaterials rarely exceeds 50%. The tailoring strategy introduced here is easily realizable in a broad array of AM techniques, making it a viable candidate for developing practical mechanical metamaterials.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Shanmugam, Dr Kumar
Authors: Kumar, S., Ubaid, J., Abishera, R., Schiffer, A., and Deshpande, V.S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:ACS Applied Materials and Interfaces
Publisher:American Chemical Society
ISSN (Online):1944-8252
Copyright Holders:Copyright © 2019 American Chemical Society
First Published:First published in ACS Applied Materials and Interfaces 11(45):42549-42560
Publisher Policy:This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes

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