塑性圧縮による弾性異方性の変化の超音波測定

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An elastic anisotropy produced by uni-axial plastic compression of a steel plate was studied with ultrasonic transverse waves.By taking into account an initial anisotropy of the plate,specimens were cut along four different directions in its plane.Giving them plastic compressive strains within about 10%,the velocities and polarization directions of transverse waves were measured by the sing-around method.For propagation in the transverse direction of specimens,it was shown that the polarization directions were patallel and perpendicular to the compression direction irrespective of plastic strain,and that the velocities varied linearly with plastic strain.Slopes of these linear velocity changes were nearly constant for each of the two polarization directions.For propagation in the thickness direction,the quite similar results were obtained on the specimens parallel and perpendicular to the rolling direction,while the rotations of polarization directions,and nonlinear velocity changes were confirmed in the other specimens.These experimental results were considered based on theoretical expressions for velocities and polarization directions,which were derived by assuming a slight anisotropy of a material to be the sum of an initial orthotropy and a strain-induced transverse isotropy.As a result,it was concluded that plastic compression produces a transverse isotropy,and,in general,rotates the anisotropy axes of materials.
社団法人日本材料学会の論文
1993-09-15

塑性圧縮による弾性異方性の変化の超音波測定

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