Testing and modeling of NiMnGa ferromagnetic shape memory alloy for static and dynamic loading conditions

Ronald N. Couch; Jayant Sirohi; Inderjit Chopra

doi:10.1117/12.659665

5 April 2006 Testing and modeling of NiMnGa ferromagnetic shape memory alloy for static and dynamic loading conditions

Ronald N. Couch, Jayant Sirohi, Inderjit Chopra

Proceedings Volume 6173, Smart Structures and Materials 2006: Smart Structures and Integrated Systems; 617305 (2006) https://doi.org/10.1117/12.659665
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

The response of NiMnGa ferromagnetic shape memory alloy to static and dynamic magnetic fields was studied. Tests involving excitation of the samples up to 10 Hz for constant stress and constant strain conditions were conducted. Based on these results, performance parameters were measured and discussed including power density, total power output and electromechanical efficiency. The effects of strain rate and material damping were also measured. It was shown that both power density and total power output were strong functions of applied stress. A maximum volumetric power density of 31 MW/m³ was measured. Once the NiMnGa behavior was characterized, an analytical model based on four experimentally measured parameters was formulated to predict the induced strain in response to a dynamic magnetic field. Comparison of the analytical model to experimental data showed good correlation for applied stresses below 0.6 MPa and above 1.33 MPa. Although requiring further refinement, the model's results are encouraging, indicating that it could be developed into a useful analytical tool for predicting NiMnGa actuator behavior.

Citation Download Citation

Ronald N. Couch, Jayant Sirohi, and Inderjit Chopra "Testing and modeling of NiMnGa ferromagnetic shape memory alloy for static and dynamic loading conditions", Proc. SPIE 6173, Smart Structures and Materials 2006: Smart Structures and Integrated Systems, 617305 (5 April 2006); https://doi.org/10.1117/12.659665

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