10.14489/td.2019.07.pp.014-022

2019, 07 July

DOI: 10.14489/td.2019.07.pp.014-022

Komarov V. A.
MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. Part 5
(pp. 14-22)

Abstract. The analytical model of the applied and internal stresses influence on the efficiency of EMAT in the region of spontaneous magnetization vectors rotation processes (a saturation magnetostriction l_s < 0) in the case of strong polarizing field is considered.It has been shown analytically and confirmed experimentally that in the presence of applied s₀ or internal s_i stresses the region of maximum EMAT efficiency in the polarizing field changes. If the product l_ss₀ or l_ss_i is greater than zero then this region shifts to the weaker fields. If the product l_ss₀ or l_ss_i is less than zero then the maximum of EMAT efficiency shifts to the stronger fields region (magnetization process is difficult) compared to the stresses absence in the sample. The EMAT efficiency for materials with l_s < 0 increases with the tensile stresses increasing and decreas with the compressive stresses increasing. It has been shown analytically and confirmed experimentally that the presence of internal stresses in the material changes the efficiency of EMAT inversely related to the magnitude of these stresses. The functional relationship between EMAT efficiency and internal stresses is demonstrated.

Keywords: magnetoelasticity, Joule effect, applied and internal stresses, double conversion of electromagnetic and acoustic fields.

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V. A. Komarov (Physical-Technical Institute, Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

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