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Proceedings Paper

Development of a meso-scale thermo-magneto-mechanical free energy model for NiMnGa
Author(s): Phillip Morrison; Stefan Seelecke; Berthold Krevet; Manfred Kohl
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Paper Abstract

This paper motivates a one-dimensional thermo-magneto-mechanical free energy model for NiMnGa. Following a discussion of material behavior and modeling purpose, we present what might be referred to as a meso-scale model, incorporating micro-scale physics while striving for macro-scale simplicity. Development of the model begins with the construction of a free energy landscape for the material, with strain and magnetization as its order parameters. This landscape includes paraboloidal energy wells - isolated from each other by energy barriers - to represent stable states of the material. The energy well positions and barrier heights are allowed to vary as functions of stress, magnetic field, and temperature. The resulting equations are employed within the theory of thermally activated processes to find the phase-fraction evolution of a sample. Previous results demonstrating the potential of the modeling approach are included.

Paper Details

Date Published: 2 April 2008
PDF: 12 pages
Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 692926 (2 April 2008); doi: 10.1117/12.776457
Show Author Affiliations
Phillip Morrison, North Carolina State Univ. (United States)
Stefan Seelecke, North Carolina State Univ. (United States)
Berthold Krevet, Forschungszentrum Karlsruhe (Germany)
Manfred Kohl, Forschungszentrum Karlsruhe (Germany)


Published in SPIE Proceedings Vol. 6929:
Behavior and Mechanics of Multifunctional and Composite Materials 2008
Marcelo J. Dapino; Zoubeida Ounaies, Editor(s)

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