Dynamic behavior and stiffness tuning in solenoid-based Ni-Mn-Ga transducers

LeAnn E. Faidley; Marcelo J. Dapino; Gregory N. Washington; Thomas A. Lograsso

doi:10.1117/12.540039

21 July 2004 Dynamic behavior and stiffness tuning in solenoid-based Ni-Mn-Ga transducers

LeAnn E. Faidley, Marcelo J. Dapino, Gregory N. Washington, Thomas A. Lograsso

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.540039
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

Ferromagnetic shape memory nickel-manganese-gallium (Ni-Mn-Ga) has shown tremendous promise as an actuator material due to its large strain and high bandwidth. However, current Ni-Mn-Ga devices are electromagnet based as this configuration allows for an externally applied force perpendicular to the applied field, and are therefore bulky, energy inefficient, and narrowband. We investigate the dynamic response of Ni-Mn-Ga driven by a solenoid transducer in which the magnetic field is aligned collinearly with the loading stress. The work focusses on the quasistatic and dynamic testing of a Ni₅₀Mn_28.7Ga_21.3 sample which is believed to have an internal stress field which plays the role of the restoring force necessary for reversible strains. This sample is shown to exhibit reversible compressive strains of -0.41% with no external forces applied. Several experimental apparatus are used in order to verify these results. The measurements demonstrate a 231% change in stiffness with applied dc magnetic fields.

Citation Download Citation

LeAnn E. Faidley, Marcelo J. Dapino, Gregory N. Washington, and Thomas A. Lograsso "Dynamic behavior and stiffness tuning in solenoid-based Ni-Mn-Ga transducers", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.540039

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