Abstract
The lowest-order shear horizontal model SH0 wave shows a great advantage in nondestructive testing (NDT) and structural health monitoring (SHM), due to the low-attenuation and non-disperse properties. In order to excite SH0 waves in non-ferromagnetic plate, this paper presents a modified design of the magnetostrictive patch transducer (MPT) based on Wiedemann Effect, which consists of an annular magnetostrictive patch, an electric toroidal coil and a permanent magnet. The cylinder permanent magnet is wider than the magnetostrictive patch to ensure the uniform distribution of the static magnetic field on directivity and amplitude. After presenting the configuration and its working principle, the governing equation of Wiedemann Effect are derived based on the theory of Joule Effect through coordinate transformation, which represents the relationship between the deformation behavior and the magnetic field. It is found that only shear stress and strain vary with additional static longitude and dynamic tangential magnetic field. The principle of the modified model is investigated by finite element simulation, which shows the optimization methods of the new model and verifies the validity of the derived equation.
How to Cite:
Guo, X. ., Xiang, Y. ., Zhu, W. . & Wang, X. ., (2019) “Design and calculation of the shear horizontal wave magnetostrcitive patch transducer based on wiedemann effect”, Review of Progress in Quantitative Nondestructive Evaluation .
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