High velocity impact behaviour of additively manufactured cellular core backed Kevlar

Tom Fisher, Humberto Almeida Jr, Zafer Kazancı, Brian G. Falzon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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This work investigates the effect of several parameters of a cellular core, protected by a Kevlar plate, under ballistic impact. Three core geometries, two sizes, and four relative densities are explored and their effects quantified. Overall, auxetic geometries (re-entrant and double arrowhead) result in a significant reduction in transmitted force at the cost of increasing the maximum displacement compared to a non-auxetic hexagonal structure. The cell size has no effect on the maximum displacement for any of the geometries or the transmitted force for the auxetics. A smaller cell size does, nonetheless, increase the peak transmitted force for the hexagonal structure. Increasing the relative density of the structures increases the transmitted force whilst decreasing the maximum displacement across all unit cells considered. This work provides a basis for the parameter selection when using cellular structures in an impact mitigation setting.

Original languageEnglish
Title of host publicationProceedings of the 23rd International Conference on Composite Materials, ICCM23
EditorsBrian Falzon, Conor McCarthy
PublisherQueen's University Belfast
Number of pages7
Publication statusPublished - 30 Jul 2023
Event23rd International Conference on Composite Materials 2023 - Belfast, United Kingdom
Duration: 31 Jul 202304 Aug 2023
https://www.iccm-central.org/Proceedings/ICCM23proceedings/index.htm (Conference proceedings)


Conference23rd International Conference on Composite Materials 2023
Abbreviated titleICCM23
Country/TerritoryUnited Kingdom
Internet address


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