Electromagnetic acoustic transducers (EMATs) can generate and detect ultrasonic waves in a conductive specimen by electromagnetic coupling without any contact with a specimen. Moreover, theoretical modeling and formulation of the process based on elastodynamics and electromagnetics can be obtained. This feature makes it possible to analyze the inspection process in detail theoretically or numerically. In this research, effects of a flaw on the propagation of ultrasonic waves and on receiver signals of EMAT testing were evaluated by using numerical analysis. Predicted receiver signals agree well with the experimental ones, which validates our analysis. The numerical result of the wave propagation explains the effects of the flaw, i. e. interruption, diffraction and multiple reflection. Among the three effects, the peak of receiver signals due to multiple reflection is well influenced by the parameters of the flaw. These results can be useful to establish a method of quantitative flaw identification by EMAT testing.
|ジャーナル||Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C|
|出版ステータス||Published - 2001|
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