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Shape memory polymer hexachiral auxetic structures with tunable stiffness

Rossiter, Jonathan; Takashima, Kazuto; Scarpa, Fabrizio; Walters, Peter; Mukai, Toshiharu

Authors

Jonathan Rossiter

Kazuto Takashima

Fabrizio Scarpa

Toshiharu Mukai



Abstract

Planar auxetic structures have the potential to impact on a wide range of applications from deployable and morphing structures to space-filling composite and medical treatments. The ability to fabricate auxetics from smart materials greatly enhances this facility by building in controllable actuation and deployment. A smart auxetic device can be compressed and fixed into a storage state. When deployment is required the device can be appropriately stimulated and the stored elastic energy is released, resulting in a marked structural expansion. Instead of using a conventional external actuator to drive deployment the material is made to undergo phase transition where one stimulus (e.g. heat) initiates a mechanical response. Here we show how smart material auxetics can be realized using a thermally responsive shape memory polymer composites. We show how a shape memory polymer auxetic hexachiral structure can be tailored to provide a tunable stiffness response in its fully deployed state by varying the angle of inter-hub connections, and yet is still able to undergo thermally stimulated deployment. © 2014 IOP Publishing Ltd.

Journal Article Type Article
Publication Date Jan 1, 2014
Journal Smart Materials and Structures
Print ISSN 0964-1726
Electronic ISSN 1361-665X
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 23
Issue 4
APA6 Citation Rossiter, J., Takashima, K., Scarpa, F., Walters, P., & Mukai, T. (2014). Shape memory polymer hexachiral auxetic structures with tunable stiffness. Smart Materials and Structures, 23(4), https://doi.org/10.1088/0964-1726/23/4/045007
DOI https://doi.org/10.1088/0964-1726/23/4/045007
Keywords soft matter, liquids and polymers, condensed matter
Publisher URL http://dx.doi.org/10.1088/0964-1726/23/4/045007




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