Development of a meso-scale thermo-magneto-mechanical free energy model for NiMnGa

Phillip Morrison; Stefan Seelecke; Berthold Krevet; Manfred Kohl

doi:10.1117/12.776457

2 April 2008 Development of a meso-scale thermo-magneto-mechanical free energy model for NiMnGa

Phillip Morrison, Stefan Seelecke, Berthold Krevet, Manfred Kohl

Proceedings Volume 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008; 692926 (2008) https://doi.org/10.1117/12.776457
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

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.

Citation Download Citation

Phillip Morrison, Stefan Seelecke, Berthold Krevet, and Manfred Kohl "Development of a meso-scale thermo-magneto-mechanical free energy model for NiMnGa", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 692926 (2 April 2008); https://doi.org/10.1117/12.776457

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