Abstract
Ultrasonic guided waves method has some advantages including long-range inspection ability and high sensitivity to multiple types of defects in structures. Electromagnetic acoustic transducer is an attractive choice to achieve the excitation and reception of ultrasonic guided waves. This type of transducer can be easily designed and well control the purity of targeted ultrasonic guided waves modes. In common, traditional EMAT only consists of magnet and coil. In ferromagnetic material, the energy conversion efficiency of EMAT based on magnetostriction is higher than that of EMAT based on Lorentz force. For improving the energy conversion efficiency and adaptability of EMAT, a thin ferromagnetic patch (such as nickel and iron-cobalt alloy) is introduced and therefore magnetostrictive patch transducer (MPT) based on magnetostriction is developed regardless of the material properties of tested structures. In this paper, two types of MPTs for pipe inspection are introduced. These two MPTs can achieve the excitation and reception of longitudinal and torsional modes, respectively. Furthermore, a direction-tunable shear horizontal mode MPT is introduced and its characteristics are evaluated. Finally, the application potentials of MPTs in nondestructive testing and structural health monitoring are discussed.
How to Cite:
Liu, Z. ., Zhang, Y. ., Hu, Y. ., Fan, J. ., Wu, B. . & He , C. ., (2019) “Progress on the development of magnetostrictive patch transducers for ultrasonic guided waves inspection”, Review of Progress in Quantitative Nondestructive Evaluation .
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