Issue << content << Determining the Degree of Anisotropy of Thin-Sheet Rolled Steel Using Electromagnetic Acoustic Transducers and Lamb Waves


DOI:

2014. . No. 2(64) - Jun 2014, pp. 62-65

Determining the Degree of Anisotropy of Thin-Sheet Rolled Steel Using Electromagnetic Acoustic Transducers and Lamb Waves

V. V. Muravjev, O. V. Muravjeva, V. A. Britvin, A. M. Kashin, I. N. Utkin

The results of theoretical and experimental studies of ultrasonic Lamb waves propagation in rolled sheets of carbon steels are presented. Based on research, measurements of the acoustic anisotropy and its distribution over the surface of the sheet were carried out using electromagnetic acoustic method. The dependences of sensitivity to changes in the speed elastic moduli of symmetric, antisymmetric, SH-waves on the ratio of the rolled thickness and wavelength are calculated. It is shown that the competent choice of the frequency range for a given rolled thickness provides maximum sensitivity of selected Lamb wave mode to acoustic properties anisotropy, and increase estimation accuracy of the anisotropy factor. The analysis of acoustic anisotropy coefficient changes subject to the sheet thickness and unevenness. Distinctive features of the proposed method are presented in comparison with waves of horizontal polarization traditionally used to evaluate the acoustic anisotropy.
 
Keywords: ultrasonic inspection, electromagnetic acoustic transducer, Lamb waves, thin-sheet rolled steel, anisotropy
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