Experimental characterization of NiMnGa ferromagnetic shape memory alloy bars under variable loading conditions

被引：11
作者：
Couch, RN [1 ]
Chopra, I [1 ]
Wuttig, M [1 ]
机构：
[1] Univ Maryland, Dept Aerosp Engn, College Pk, MD 20742 USA
来源：
SMART STRUCTURES AND MATERIALS 2002: SMART STRUCTURES AND INTEGRATED SYSTEMS | 2002年 / 4701卷
关键词：
Magnetic Shape Memory; magnetic anisotropy; actuator characterization; strain rate;
D O I：
10.1117/12.474684
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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 yeilded 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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收藏
页码：29 / 39
页数：11
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