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20 April 2007 Multiscale theory of thin film magnetic shape memory alloy microactuators
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Abstract
This paper investigates the nano-macro transition in magnetic shape memory alloy(MSMA) thin films using a recently developed sharp phase front-based three-dimensional (3D) constitutive model outlined by Stoilov (JSMS 2007), and originally proposed in the 1D context by Stoilov and Bhattacharyya (Acta Mat 2002). The key ingredient in the model is the recognition of martensitic variants as separate phases in a MSMA domain. Evolution of the interface between these phases is taken as an indicator of the process of reorientation in progress. A formulation of the Helmholtz free energy potential based on Ising model has been derived. The implications of the external magnetic field on the initiation of phase transformation are studied for various mechanical loading modes.
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Vesselin Stoilov "Multiscale theory of thin film magnetic shape memory alloy microactuators", Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 65262A (20 April 2007); https://doi.org/10.1117/12.717893
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