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Characterization of shape memory alloy wires integrated into lightweight structures

Materialcharakterisierung von Drähten aus Formgedächtnislegierung zur Integration in Leichtbaustrukturen
: Senf, Björn; Bucht, Andre; Drossel, Welf-Guntram; Elibol, Cagatay; Wagner, Martin Franz-Xaver

Kroll, Lothar (Hrsg.) ; TU Chemnitz:
2nd International MERGE Technologies Conference, IMTC 2015 : Lightweight Structures. October 1st - 2nd 2015, Technische Universität Chemnitz
Auerbach/Vogtl.: Verlag Wissenschaftliche Scripten, 2015
ISBN: 3-95735-025-5
ISBN: 978-3-95735-025-1
International Merge Technologies Conference <2, 2015, Chemnitz>
Fraunhofer IWU ()
adaptive hybrid structures; morphing polymer compounds; integration of functions into lightweight structures; shape memory alloys; NiTi

The integration of smart materials into polymer compounds is one promising technology to improve lightweight structures by enhancing their intrinsic range of functions [1]. Integration of piezoelectric fiber composites [2], dielectric elastomer actuators [3], or wires made of thermal shape memory alloys (SMA) into a thermoplastic polymer offers great potential due to their sensoric and actuatoric behavior. In this study we focus on the integration of SMA wires. This paper presents experimental and theoretical results on functional fatigue, the relaxation behavior and the adhesive strength to polymers of uniaxially loaded thermal SMA actuator wires. Our combined study shows that these considerably different aspects and extensive experimental work is required to develop reliable morphing polymer compounds. An exemplary structure is shown in Fig. 1 that bends because of the asymmetric thickness above and below the layer of the SMA wires when activated.