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3D printed polyurethane honeycombs for repeated tailored energy absorption

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)172-183
Number of pages12
JournalMaterials and Design
Volume112
Early online date9 Sep 2016
DOIs
DateAccepted/In press - 23 Aug 2016
DateE-pub ahead of print - 9 Sep 2016
DatePublished (current) - 15 Dec 2016

Abstract

Fused filament fabrication (FFF) 3D printing of thermoplastic polyurethanes (TPUs) offers a unique capability to manufacture tailorable, flexible cellular structures which can be designed and optimised for specific energy absorbing applications. This paper describes the first application of this methodology in the creation and experimental analysis of 3D printed cellular structures, which are capable of undergoing repeated compressions to densification without failure. A parametric study has been undertaken, capturing the energy absorbing capability of hexagonal arrays manufactured from two types of TPU, with relative densities 0.18–0.49. Arrays were subject to compressions at strain rates 0.03–0.3 s− 1 and were capable of absorbing energies over the range of 0.01–0.34 J/cm3, before recovering elastically. Critically, samples attained a maximum energy absorbing ‘efficiency’ of 0.36, which is comparable to that of traditional expanded closed cell polyurethane foams. The energy absorption behaviour of all structures was found to be dependent on strain rate and cell orientation with respect to the compression direction. This study shows the clear potential of FFF 3D printing for the creation of a new breed of cellular architectures, which are not constrained by existing manufacturing principles, offering the designer the capability to create resilient architectures specifically tailored to operational applications and environmental conditions.

    Research areas

  • Cellular structures, Thermoplastic polyurethane, 3D printing, Energy absorption

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at http://dx.doi.org/10.1016/j.matdes.2016.08.062. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

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