Journal
SMART MATERIALS AND STRUCTURES
Volume 23, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/23/4/045007
Keywords
auxetic; shape memory polymer; deployable structures; actuator
Funding
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/I032533/1]
- EPSRC Building Global Engagements in Research programme
- EPSRC [EP/I032533/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I032533/1] Funding Source: researchfish
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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.
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