強磁性体における音弾性定数の外部磁場による変化

概要

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The dependence of acoustoelastic constants on external magnetic fields was experimentally investigated for JIS-SS41 steel specimens. In the case of ferromagnetic materials, the elastic wave velocities at a demagnetized state are slightly smaller than purely elastic velocities pertaining to a highly magnetized state. This occurs due to magnetoelastic interaction, which in turn depends on the stress state. In the present study, We measured the propagation velocities of longitudinal and shear waves in steel specimens as functions of uniaxial stress and external magnetic field. We found that in the demagnetized state, the velocity change with stress showed different slopes for compression and tension. This difference decreased as the specimens were magnetized, approaching its saturation. As for acoustoelastic birefringence, which measures the principal stress difference, the effect of magnetoelastic interactions is relatively weak, while for the longitudinal/shear wave velocity ratio, which is proportional to the sum of principal stresses, this effect may induce considerable errors. Magnetization of steel components can therefore improve the accuracy of acoustoelastic stress measurements. A discussion is given for the strength of magnetization required.
一般社団法人日本機械学会の論文
1990-11-25