Phenomenological modeling of ferromagnetic shape memory alloys

Bjorn Kiefer; Dimitris C. Lagoudas

doi:10.1117/12.540081

21 July 2004 Phenomenological modeling of ferromagnetic shape memory alloys

Bjorn Kiefer, Dimitris C. Lagoudas

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.540081
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

A thermodynamically consistent phenomenological model is presented which captures the ferromagnetic shape memory effect, i. e. the large macroscopically observable shape change of magnetic shape memory materials under the application of external magnetic fields. In its most general form the model includes the influence of the microstructure for both the volume fraction of different martensitic variants and magnetic domains on the described macroscopic constitutive behavior. A phase diagram based approach is taken to postulate functions governing the onset and termination of the reorientation process. A numerical example is given for an experiment on a NiMnGa single crystal specimen reported in the literature, for which the model is reduced to a two-dimensional case of an assumed magnetic domain structure.

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Bjorn Kiefer and Dimitris C. Lagoudas "Phenomenological modeling of ferromagnetic shape memory alloys", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.540081

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