This paper presents experimental and simulation results on the performance of a new kind of linear actuator making use of the magnetic shape memory (MSM) effect. The actuation material is a Ni-Mn-Ga foil of 200 μm thickness that has been fabricated from a bulk Ni-Mn-Ga (100) single crystal consisting of 10 M martensite variants at room temperature. Stress-strain experiments on tensile test structures demonstrate that the stress needed for reorientation of martensite variants is about 1.2 MPa. The low twinning stress allows magnetic-field induced variant switching, the basic mechanism of MSM actuation. A Ni-Mn-Ga foil actuator is fabricated by lithography and hybrid integration. The actuator shows a maximum magneto strain of 4.9%, which is limited by the constraints of fixation and loading. Upon tensile loading at 1.5 MPa, linear actuation cycles are generated with an actuation stroke of 2.2%. The linear actuator is used as a benchmark system for modeling the coupled magneto-mechanical behavior of MSM actuation. We present finite element simulations based on a thermodynamic Gibbs free energy model that describes the observed tensile stress-dependence of magneto strain in many respects.
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ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 28–October 1, 2010
Philadelphia, Pennsylvania, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-4415-1
PROCEEDINGS PAPER
A Ferromagnetic Shape Memory Foil Actuator
Manfred Kohl,
Manfred Kohl
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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Berthold Krevet,
Berthold Krevet
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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Srinivasa R. Yeduru,
Srinivasa R. Yeduru
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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Alexei Sozinov
Alexei Sozinov
AdaptaMat Ltd., Helsinki, Finland
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Manfred Kohl
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Berthold Krevet
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Srinivasa R. Yeduru
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Yossi Ezer
AdaptaMat Ltd., Helsinki, Finland
Alexei Sozinov
AdaptaMat Ltd., Helsinki, Finland
Paper No:
SMASIS2010-3652, pp. 41-48; 8 pages
Published Online:
April 4, 2011
Citation
Kohl, M, Krevet, B, Yeduru, SR, Ezer, Y, & Sozinov, A. "A Ferromagnetic Shape Memory Foil Actuator." Proceedings of the ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1. Philadelphia, Pennsylvania, USA. September 28–October 1, 2010. pp. 41-48. ASME. https://doi.org/10.1115/SMASIS2010-3652
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