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 ls < 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 si stresses the region of maximum EMAT efficiency in the polarizing field changes. If the product lss0 or lssi is greater than zero then this region shifts to the weaker fields. If the product lss0 or lssi 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 ls < 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.
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