直流電位差法による三次元き裂の形状評価法の提案

抄録

A new procedure is proposed to evaluate the 3D crack shape nondestructively with high accuracy by utilizing the direct current electrical potential method. The evaluation procedure is carried out by comparing the measured values of electrical potential distribution and those calculated from an analytical method where the crack is modeled as a continuous distribution of 3D double sources. The optimization method is used in order to find accurate solutions. An elliptical embedded crack and a semielliptical surface crack on the back wall in a plate for any aspect ratio of major to minor axes are evaluated especially with respect to location, length and inclination of the crack. The availability of the procedure is verified by some experiments using stainless steels.