Abstract
Magnetically induced changes in the velocity of 4.5-MHz ultrasonic shear waves have been measured as a function of tensile stress in polycrystalline A-36 steel. The velocity changes are dependent on the relative orientations of the shear wave polarization, the magnetic field, and the external tensile stress. When the shear wave is polarized and propagated perpendicular to the tensile stress, the velocity changes induced by a magnetic field applied parallel to either stress or polarization were found to decrease with stress. This stress dependence of the magnetically induced velocity change shows potential for the nondestructive evaluation of stress in ferromagnetic materials.
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