Energy absorption characteristics of additively manufactured plate-lattices under low- velocity impact loading

Andrew, J. J., Schneider, J. , Ubaid, J., Velmurugan, R., Gupta, N.K. and Kumar, S. (2021) Energy absorption characteristics of additively manufactured plate-lattices under low- velocity impact loading. International Journal of Impact Engineering, 149, 103768. (doi: 10.1016/j.ijimpeng.2020.103768)

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This study is focused on the low-velocity impact response of 3D plate-lattices fabricated via stereolithography additive manufacturing (AM). Elementary (SC, BCC and FCC) and hybrid (SC-BCC, SC-FCC and SC-BCC-FCC) configurations were tested and the effects of impact energy, relative density, plate-thickness, multiple impacts and impact angle on the dynamic crushing behavior and energy absorption characteristics were analyzed. The experimental results reveal that the hybrid lattices, due to the existence of larger number of open and closed sub-cells, were able to attenuate the peak impact stress transmitted to the structure and extend the duration of the load pulse (high toughness). A significant energy dependency of contact force-displacement characteristics of hybrid structures was noticed with increase in impact energy. The SC-BCC-FCC hybrid plate-lattices depicted a 70% increase in toughness and their specific energy absorption capacity is higher than the conventional aluminum lattices and other practical metamaterials. Experimental observations also revealed that the distribution of plates in each elementary structure in hybrid configuration plays an important role in mitigating the deleterious failure mode by transforming the brittle mode fracture into progressive damage of the plate-lattices. This paper, believed to be the first comprehensive experimental study, discusses the role of relative density, plate-thickness, multiple impacts, impact energy and oblique impact on the low velocity impact response of geometrically hybridized plate-lattice structures. The results of this investigation suggest that the concept of hybridization of plate-lattice architectures in conjunction with AM will enable development of lightweight high impact energy absorbing structures for a wide variety of applications.

Item Type:Articles
Additional Information:Authors would like to thank to Abu Dhabi National Oil Company (ADNOC) for providing the research grant (Award No: EX2016-000010). SK would like to thank the University of Glasgow for the start-up grant.
Glasgow Author(s) Enlighten ID:Schneider, Johannes and Kumar, Professor Shanmugam
Authors: Andrew, J. J., Schneider, J., Ubaid, J., Velmurugan, R., Gupta, N.K., and Kumar, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:International Journal of Impact Engineering
ISSN (Online):1879-3509
Published Online:05 November 2020
Copyright Holders:Crown Copyright © 2020 Published by Elsevier Ltd
First Published:First published in International Journal of Impact Engineering 149: 103768
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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