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Lena Seigner
Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany

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Journal article
Published: 03 August 2021 in Actuators
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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°.

ACS Style

Lena Seigner; Georgino Tshikwand; Frank Wendler; Manfred Kohl. Bi-Directional Origami-Inspired SMA Folding Microactuator. Actuators 2021, 10, 181 .

AMA Style

Lena Seigner, Georgino Tshikwand, Frank Wendler, Manfred Kohl. Bi-Directional Origami-Inspired SMA Folding Microactuator. Actuators. 2021; 10 (8):181.

Chicago/Turabian Style

Lena Seigner; Georgino Tshikwand; Frank Wendler; Manfred Kohl. 2021. "Bi-Directional Origami-Inspired SMA Folding Microactuator." Actuators 10, no. 8: 181.

Conference paper
Published: 20 November 2020 in Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications
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This paper presents the design, fabrication and performance of origami-based folding microactuators based on NiTi films showing the one-way shape memory effect. Freestanding NiTi films are micromachined by laser cutting or photolithography to achieve double-beam structures allowing for direct Joule heating with an electrical current. The NiTi microactuators are interconnected to rigid sections (tiles) forming an initial planar system that self-folds into a predetermined 3D shape upon heating. A thermo-mechanical treatment is used for shape setting of as-received specimens to approach a maximum folding angle of 180°. The bending moments, bending radii and load-dependent folding angles upon Joule heating are evaluated. The shape setting process is particularly effective for small bending radii, which, however, generates residual plastic strain. After shape setting, unloaded beam structures show recoverable bending deflection between 0° and 140° for a maximum heating power of 900 mW. By introducing additional loads to account for the effect of the tiles, the smooth folding characteristic evolves into a sharp transition, whereby full deflection up to 180° is reached.

ACS Style

Lena Seigner; Olha Bezsmertna; Sebastian Fähler; Georgino Kaleng Tshikwand; Frank Wendler; Manfred Kohl. Origami-Inspired Shape Memory Folding Microactuator. Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications 2020, 64, 6 .

AMA Style

Lena Seigner, Olha Bezsmertna, Sebastian Fähler, Georgino Kaleng Tshikwand, Frank Wendler, Manfred Kohl. Origami-Inspired Shape Memory Folding Microactuator. Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications. 2020; 64 (1):6.

Chicago/Turabian Style

Lena Seigner; Olha Bezsmertna; Sebastian Fähler; Georgino Kaleng Tshikwand; Frank Wendler; Manfred Kohl. 2020. "Origami-Inspired Shape Memory Folding Microactuator." Proceedings of 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications 64, no. 1: 6.