磁場中での等方強磁性材料の音弾性効果

概要

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The theory of acoustoelastic effects in soft -ferromagnets is formulated. The materials are assumed to be isotropic and magnetostrictive. The initial magnetization curve is set to be linear with respect to the applied magnetic field. General acoustoelastic formulae are obtained taking account of the effects of magnetic field, magnetostriction, and applied stress. The stress application has direct acoustoelastic effects and indirect effects due to the stress dependence of magnetic susceptibility. Special cases of simple geometries giving rise to analytical solutions for the elastic wave speed are examined. For the case of uniaxial stresses, magnetostriction causes a shift of stress vs. acoustic birefringence curve, and a slight no linearity of the curve arises from the stress dependence of the susceptibility. The case of plane stresses is also studied to show a possibility to specify both components of the plane stress using elastic waves propagating normally to the plane of a plate.
社団法人日本材料学会の論文
1988-07-15