Model for the magnetomechanical behavior of NiMnGa driven with collinear field and stress

Xiang Wang; Marcelo J. Dapino

doi:10.1117/12.658292

6 April 2006 Model for the magnetomechanical behavior of NiMnGa driven with collinear field and stress

Xiang Wang, Marcelo J. Dapino

Proceedings Volume 6170, Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics; 617016 (2006) https://doi.org/10.1117/12.658292
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

This paper presents a model for NiMnGa transducers driven with collinear magnetic fields and stresses. Prior work by the authors demonstrates the existence of reversible strains under the application of collinear magnetic fields and stresses oriented along the [001] crystallographic axis of a cylindrical rod of single-crystal Ni₅₀Mn_28.7Ga_21.3. Internal bias stresses from pinning sites in the material are believed to provide the restoring force which allows for the reversibility of the strain. A constitutive model to describe the motion of twin boundaries in the presence of energetically strong pinning sites is presented. The effective pinning strength is represented by an internal bias stress oriented transversely. Stochastic homogenization is then used to account for variability in the bias stresses throughout the material and inhomogeneity in the interaction field intensity. The internal rod dynamics are modeled through force balancing with boundary conditions dictated by the constructive details of the transducer and mechanical load. The model is formulated in variational form, resulting in a second-order temporal system with magnetic field induced strain as the driving mechanism. Model result for unloaded conditions is compared with experimental measurements.

Citation Download Citation

Xiang Wang and Marcelo J. Dapino "Model for the magnetomechanical behavior of NiMnGa driven with collinear field and stress", Proc. SPIE 6170, Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics, 617016 (6 April 2006); https://doi.org/10.1117/12.658292

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