Wavelength-Selective Shape Memory Alloy for Wireless Microactuation of a Bistable Curved Beam

Sajid Zaidi (1) , Frédéric Lamarque (1) , Jérôme Favergeon (1) , Olivier Carton (2, 1) , Christine Prelle (1)

1 Roberval - Roberval
2 LPMC - Laboratoire de Physique de la Matière Condensée

Wireless and/or sensorless components offer a great potential for friendly integration in mechatronic systems. This paper presents a wireless technique to actuate a bistable curved beam using wavelength-selective shape-memory-alloy (SMA) thin foils. The SMA thin foil is irradiated remotely by continuous-mode laser diodes of 785 and 658 nm wavelengths. First, a comparison between two numerical thermal models is done. These models obey the same conduction and convection equations but the effect of phase transformation is integrated in two different ways. A good agreement is found between the two simulation results. Then, the force generated by the SMA sample (size: 3 mm × 1 mm × 0.1 mm), during martensite-to-austenite phase transformation, is experimentally measured using a miniature force sensor. The force comes out to be 403 mN with 70 mW laser power. Using this force value, a bistable curved beam is designed and fabricated by rapid prototyping technique. Optical filtering layers, which are responsible for the wavelength-selective response, are directly deposited onto the SMA samples. Finally, two SMA samples are used to switch the curved beam between its two stable positions.

Mots clés: Bistable curved beam; laser actuation; mechatronics; microactuator; shape memory alloy (SMA); wavelength-selective response

Domaines: Sciences de l'ingénieur [physics]; Micro et nanotechnologies/Microélectronique

Sajid Zaidi, Frédéric Lamarque, Jérôme Favergeon, Olivier Carton, Christine Prelle. Wavelength-Selective Shape Memory Alloy for Wireless Microactuation of a Bistable Curved Beam. IEEE Transactions on Industrial Electronics, 2011, 58 (12), pp.5288 - 5295. ⟨10.1109/tie.2010.2046609⟩. ⟨hal-01911359⟩