音弾性スペクトル法による残留応力の非破壊測定

概要

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A residual stress state was produced in a circular plate of steel by welding a small hole in the middle of the plate, and nondestructive determination of this stress distribution was studied by the acoustoelastic spectrum method. The amplitude spectra of reflected transverse waves were first analyzed to obtain the polarization directions and the velocity difference of two transverse waves, and it was noticed that, in the resulting distribution of the velocity difference, apparent peaks existed near the elastic-plastic boundary. The results of the polarization directions and velocity difference were then applied to the acoustoelastic law, and the stress distribution in the elastic region was determined, either employing the shear difference method or assuming axial symmetry of the distribution. These results were shown to agree well with those of destructive measurements by the strain gauge method, and the peak locations in the velocity difference distribution were also confirmed to be very close to the elastic-plastic boundary. From this, it was concluded that the present method was very useful for nondestructive stress measurements.
1999-05-25