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Bistable Actuation Based on Antagonistic Buckling SMA Beams

Chen, Xi ORCID iD icon 1; Bumke, Lars; Quandt, Eckhard; Kohl, Manfred 1
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)

Abstract:

Novel miniature-scale bistable actuators are developed, which consist of two antagonistically coupled buckling shape memory alloy (SMA) beams. Two SMA films are designed as buckling SMA beams, whose memory shapes are adjusted to have opposing buckling states. Coupling the SMA beams in their center leads to a compact bistable actuator, which exhibits a bi-directional snap-through motion by selectively heating the SMA beams. Fabrication involves magnetron sputtering of SMA films, subsequent micromachining by lithography, and systems integration. The stationary force–displacement characteristics of monostable actuators consisting of single buckling SMA beams and bistable actuators are characterized with respect to their geometrical parameters. The dynamic performance of bistable actuation is investigated by selectively heating the SMA beams via direct mechanical contact to a low-temperature heat source in the range of 130–190 °C. The bistable actuation is characterized by a large stroke up to 3.65 mm corresponding to more than 30% of the SMA beam length. Operation frequencies are in the order of 1 Hz depending on geometrical parameters and heat source temperature. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000164216
Veröffentlicht am 13.11.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 11.11.2023
Sprache Englisch
Identifikator ISSN: 2076-0825
KITopen-ID: 1000164216
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Actuators
Verlag MDPI
Band 12
Heft 11
Seiten Art.-Nr.: 422
Vorab online veröffentlicht am 09.11.2023
Schlagwörter bistability; bistable actuation; shape memory actuator; antagonistic coupling; waste heat recovery
Nachgewiesen in Web of Science
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Scopus
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