28 April 2011 Preliminary model of a 3D dynamically loaded galfenol based stress sensor using rate equations
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Abstract
The Villari effect of magnetostrictive materials, a change in magnetization due to an external stress, is used for sensing applications. For a dynamically loaded sensor, one measures the time-varying magnetization on the material. The question is, from these measurements, could information be extracted about all the applied stresses (the three axial and the three shear) on the material? In a previously developed rate-equation model [P. Weetman and G. Akhras, SPIE Proceedings Vol. 7644, 76440R], essentially the inverse of this problem was discussed where the input was a set of known stresses and the output was the calculated resulting magnetizations. A preliminary conceptual design of a Galfenol based 3D dynamical sensor is presented. In the proposed prototype sensing device, one can measure the time-varying magnetization and its derivative in all three directions. Incorporating the previously developed 3D rate equation model, a new model is developed pertaining to this sensor. It will be shown that, under certain conditions, all stresses can be found from the magnetization measurements. The required calculations are presented and then performed on a sample set of magnetization data for validation. From this model, the implications to future sensing devices are discussed as well as suggestions on improvements to the model and the prototype.
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Philip Weetman, George Akhras, "Preliminary model of a 3D dynamically loaded galfenol based stress sensor using rate equations", Proc. SPIE 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011, 79781B (28 April 2011); doi: 10.1117/12.880494; https://doi.org/10.1117/12.880494
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