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Shape memory polymer hexachiral auxetic structures with tunable stiffness

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


Jonathan Rossiter

Kazuto Takashima

Fabrizio Scarpa

Toshiharu Mukai


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.


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),

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
Keywords soft matter, liquids and polymers, condensed matter
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