Abstract
This paper presents a study of the mechanical and thermal properties of SMA microvalves, which are driven by a microactuator of a NiTi foil or a Ni 2MnGa thin film. By coupled finite element simulations, von Mises stress profiles and resulting actuation forces are determined, which are compared with experimental force-displacement characteristics. The relatively high phase transformation temperatures of the used Ni2MnGa specimens Mf / Af of 92 / 125°C, give rise to cooling times of about 25 ms compared to 90 ms for NiTi. Thus, Ni2MnGa microvalves show a superior switching performance. However, due to brittleness and buckling instability, Ni2MnGa microvalves only allow a maximum controllable pressure difference of 70 kPa, which is more than a factor of 7 smaller compared to NiTi microvalves.
Original language | English |
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Pages (from-to) | 333-342 |
Number of pages | 10 |
Journal | Journal De Physique. IV : JP |
Volume | 115 |
DOIs | |
Publication status | Published - 2004 Dec 1 |
Event | EUROMECH-MECAMAT'2003: 7th European Mechanics of Materials Conference on Adaptive Systems and Materials: Constitutive Materials and Hybrid Structures - Frejus, France Duration: 2003 May 18 → 2003 May 23 |
ASJC Scopus subject areas
- Physics and Astronomy(all)