28 March 2012 Design of a deployable structure with shape memory polymers
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Auxetic (negative Poisson's ratio) configurations have recently been used to build prototypes of deployable structures using classical shape memory alloys (Nickel-Titanium-Copper). Chiral configurations, featuring three or more inter-connected spiral-wound hubs, exploit efficient tensile-rotational mechanisms. These structures offer high deployability ratios in structural elements with load-bearing characteristics. Shape memory polymers have the potential to replace these shape memory alloys and other stored-energy actuators, and have the attractive properties of low mass, high actuation strain, easy fabrication and tuneable thermal properties. In this work we discuss how shape memory polymers (SMP) integrated into a chiral core could offer enhanced deployable characteristics and increase the efficiency of the auxetic deformations in these unusual cellular structures. We consider the spiral-wound fundamental component needed for SMP n-chiral prototypes and present test results showing actuation motion of expanding SMP deployable structures. Applications likely to benefit from these structures include lightweight elements for structural engineering applications, deployable structures for space applications and implantable medical devices.
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Jonathan Rossiter, Jonathan Rossiter, Fabrizio Scarpa, Fabrizio Scarpa, Kazuto Takashima, Kazuto Takashima, Peter Walters, Peter Walters, "Design of a deployable structure with shape memory polymers", Proc. SPIE 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012, 83420Y (28 March 2012); doi: 10.1117/12.915476; https://doi.org/10.1117/12.915476

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