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Proceedings Paper

Bistable shape memory thin film actuators
Author(s): Tobias Sterzl; Bernhard Winzek; Martina Mennicken; Rene Nagelsdiek; Helmut Keul; Hartwig Hoecker; Eckhard Quandt
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Paper Abstract

Shape memory alloys (SMA) are able to provide high work output when they undergo the martensitic transformation. Therefore, they present a favorable actuation mechanism for microsystems, e.g. for microvalves, switches or microgrippers. Sputter deposited thin SMA films are already in use as free-standing films or as composites in combination with a substrate. In the case of a composite, the substrate works as a bias spring and enables the SMA actuator to show a two way behavior. To enlarge the potentialities of shape memory based actuators a bistable principle is presented. This is realized by the combination with a polymer exhibiting a glass transition temperature (Tg) between the hysteresis loop of the shape memory composite. The fabrication of this composite is described with a special emphasis on the development of suitable polymer samples.

Paper Details

Date Published: 13 August 2003
PDF: 9 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484696
Show Author Affiliations
Tobias Sterzl, Ctr. of Advanced European Studies and Research (Germany)
Bernhard Winzek, Ctr. of Advanced European Studies and Research (Germany)
Martina Mennicken, RWTH Aachen (Germany)
Rene Nagelsdiek, RWTH Aachen (Germany)
Helmut Keul, RWTH Aachen (Germany)
Hartwig Hoecker, RWTH Aachen (Germany)
Eckhard Quandt, Ctr. of Advanced European Studies and Research (Germany)


Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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