15 July 2002 Experimental characterization of NiMnGa ferromagnetic shape memory alloy bars under variable loading conditions
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Abstract
A comprehensive experimental characterization of single crystal, martensite, NiMnGa rods is the current subject of study. Preliminary actuator force-displacement curves for DC magnetic fields up to 0.6 T in the static regime have been developed. A peak static actuation force of 5.5N at 0.4 mm in was observed. The effects AC magnetic fields below magnetic saturation were also examined. The dynamic force-displacement characteristics of the NiMnGa alloy in the presence of mechanical preloads was studied. Dynamic testing at AC fields of 0.3 T yielded strains of up to 1.2% and dynamic loads of up to 7 N. A possible material dependence on strain-rate and was observed from the experimental dynamic stress-strain curves.
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Ronald N. Couch, Inderjit Chopra, Manfred R. Wuttig, "Experimental characterization of NiMnGa ferromagnetic shape memory alloy bars under variable loading conditions", Proc. SPIE 4701, Smart Structures and Materials 2002: Smart Structures and Integrated Systems, (15 July 2002); doi: 10.1117/12.474684; https://doi.org/10.1117/12.474684
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