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Proceedings Paper

Experimental characterization of NiMnGa magnetic shape memory alloy rods under dynamic magnetic fields
Author(s): Ronald N. Couch; Inderjit Chopra
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Paper Abstract

A comprehensive, experimental characterization of single crystal, NiMnGa rods is the current subject of study. Static tests aimed at characterizing the force-deflection behavior show that the actuator has two stiffnesses, a low stiffness associated with the region of twin boundary motion and a high stiffness when the material is in the fully twinned condition. For a 2×3×16 mm specimen, a block force of 4.35 N and a free strain of 5.02% were determined experimentally. Dynamic test of the material exposed to a 0.85 T peak, AC, inductive field show that the strain and force generated by the actuator consist of mean and dynamic components. For peak performance, the recovery force acting on the NiMnGa actuator must be optimized. Experimental results indicate that NiMnGa has a maximum volumetric energy density of 12.15 kJ/m3 and a maximum weight defined energy density of 1.45 J/kg. Using energy density by weight as a metric, NiMnGa has an energy output on the same order of magnitude as commercial piezostacks.

Paper Details

Date Published: 13 August 2003
PDF: 12 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484744
Show Author Affiliations
Ronald N. Couch, Univ. of Maryland, College Park (United States)
Inderjit Chopra, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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