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Proceedings Paper

Magnetomechanical performance and mechanical properties of Ni-Mn-Ga ferromagnetic shape memory alloys
Author(s): Steven J. Murray; Samuel M. Allen; Robert C. O'Handley; Thomas A. Lograsso
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Paper Abstract

A Ni-Mn-Ga ferromagnetic shape memory alloy was tested for strain versus applied field and strain versus stress. Field- induced strains up to 6 percent were measured with a hysteresis of about 160 kA/m. The results are compared with the predictions of modeling with a focus on hysteresis. The model is applied to the case in which the magnetic external field and external load are orthogonal to each other. It predicts the magneto-mechanical hysteresis as a function of the yield stress in a twinned martensite. Magnetization versus applied field was measured on a sample that was mechanically constrained in order to understand the magnetization behavior of the sample in the absence of twin motion. These measurements give the magnetic anisotropy and are used to estimate the demagnetization fields. The measured behavior of strain with stress at constant field is approximated by the model.

Paper Details

Date Published: 14 June 2000
PDF: 9 pages
Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388253
Show Author Affiliations
Steven J. Murray, Massachusetts Institute of Technology (United States)
Samuel M. Allen, Massachusetts Institute of Technology (United States)
Robert C. O'Handley, Massachusetts Institute of Technology (United States)
Thomas A. Lograsso, Ames Lab. (United States)

Published in SPIE Proceedings Vol. 3992:
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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