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Effects of disruptive inclusions in sandwich core lattices to enhance energy absorbency and structural isolation performance

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Title: Effects of disruptive inclusions in sandwich core lattices to enhance energy absorbency and structural isolation performance
Authors: Wadee, MA
Phillips, ATM
Bekele, A
Item Type: Journal Article
Abstract: The energy absorption and structural isolation performance of axially-compressed sandwich structures constructed with stiff face plates separated with an auxetic lattice core metamaterial is studied. Advances in additive manufacturing increasingly allow bespoke, carefully designed, structures to be included within the core lattice to enhance mechanical performance. Currently, the internal structure of the lattice core is deliberately disrupted geometrically to engineer suitable post-buckling behaviour under quasi-static loading. The desirable properties of a high fundamental stiffness and a practically zero underlying stiffness in the post-buckling range ensure that energy may be absorbed within a limited displacement and that any transfer of strain to an attached structure is minimized as far as is feasible. It is demonstrated that such disruptions can be arranged to enhance the panel performance. The concept may be extended to promote cellular buckling where the internal lattice buckles with densification occurring at defined locations and in sequence to absorb energy while maintaining a low underlying mechanical stiffness.
Issue Date: 15-May-2020
Date of Acceptance: 21-Apr-2020
URI: http://hdl.handle.net/10044/1/79604
DOI: 10.3389/fmats.2020.00134
ISSN: 2296-8016
Publisher: Frontiers Media
Journal / Book Title: Frontiers in Materials
Volume: 7
Copyright Statement: © 2020 Wadee, Phillips and Bekele. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Keywords: 0912 Materials Engineering
1007 Nanotechnology
Publication Status: Published
Open Access location: http://dx.doi.org/10.3389/fmats.2020.00134
Article Number: ARTN 134
Appears in Collections:Civil and Environmental Engineering