NDLI: Bi-Directional Origami-Inspired SMA Folding Microactuator

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Bi-Directional Origami-Inspired SMA Folding Microactuator

Content Provider	MDPI
Author	Seigner, Lena Tshikwand, Georgino Wendler, Frank Kohl, Manfred
Copyright Year	2021
Description	We present the design, fabrication, and characterization of single and antagonistic SMA microactuators allowing for uni- and bi-directional self-folding of origami-inspired devices, respectively. Test devices consist of two triangular tiles that are interconnected by double-beam-shaped SMA microactuators fabricated from thin SMA foils of 20 µm thickness with memory shapes set to a 180° folding angle. Bi-directional self-folding is achieved by combining two counteracting SMA microactuators. We present a macromodel to describe the engineering stress–strain characteristics of the SMA foil and to perform FEM simulations on the characteristics of self-folding and the corresponding local evolution of phase transformation. Experiments on single-SMA microactuators demonstrate the uni-directional self-folding and tunability of bending angles up to 180°. The finite element simulations qualitatively describe the main features of the observed torque-folding angle characteristics and provide further insights into the angular dependence of the local profiles of the stress and martensite phase fraction. The first antagonistic SMA microactuators reveal bi-directional self-folding in the range of −44° to +40°, which remains well below the predicted limit of ±100°.
Starting Page	181
e-ISSN	20760825
DOI	10.3390/act10080181
Journal	Actuators
Issue Number	8
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2021-08-03
Access Restriction	Open
Subject Keyword	Actuators Software Engineering Self-folding Origami Microactuation Shape Memory Alloy Foils Micro Technology
Content Type	Text
Resource Type	Article

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