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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kohl, Manfred
Karlsruhe Institute of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2024Finite‐Element Analysis of an Antagonistic Bistable Shape Memory Alloy Beam Actuator
- 2024SMA Film-Based Elastocaloric Cooling Devicescitations
- 2023Power Optimization of TiNiHf/Si Shape Memory Microactuatorscitations
- 2023Bistable Actuation Based on Antagonistic Buckling SMA Beamscitations
- 2021Bi-Directional Origami-Inspired SMA Folding Microactuatorcitations
- 2020Origami-Inspired Shape Memory Folding Microactuatorcitations
- 2018Coupled Simulation of Thermomagnetic Energy Generation Based on NiMnGa Heusler Alloy Filmscitations
- 2018Cobalt Gradient Evolution in Sputtered TiNiCuCo Films for Elastocaloric Coolingcitations
- 2018Miniaturization of Shape Memory Actuators (Invited Review)
- 2018SMA Foils for MEMS: From Material Properties to the Engineering of Microdevicescitations
- 2017Mesoscale simulation of elastocaloric cooling in SMA filmscitations
- 2017Simultaneous Measurement of Continuum Strain Field and Intermittent Martensite Band Nucleation in Single Crystal Ni-Mn-Ga Foils
- 2017Large Anhysteretic Deformation of Shape Memory Alloys at Postcritical Temperatures and Stressescitations
- 2017Structural and Magnetic Properties of Magnetic Shape Memory Alloys on Ni-Mn-Co-In Self-standing Filmscitations
- 2016Energy-efficient miniature-scale heat pumping based on shape memory alloyscitations
- 2015Thermal Energy Harvesting Based on Metamagnetic Shape Memory Alloys
- 2012From Highly Monodisperse Indium and Indium Tin Colloidal Nanocrystals to Self-Assembled Indium Tin Oxide Nanoelectrodescitations
- 2007New materials for micro-scale sensors and actuators:an engineering reviewcitations
Places of action
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article
Bistable Actuation Based on Antagonistic Buckling SMA Beams
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. The bistable actuation at low-temperature differences provides a route for waste heat recovery.