材料表面薄肉層非破壊評価への電位差法の適用

概要

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It is well known that high-frequency a. c. current flows along a surface due to the skin effect. A method for applying the a. c. potential drop technique is proposed to nondestructively evaluate the thickness and the electromagnetic properties of a thin layer on a material surface. First, Maxwell's equations are solved to obtain the potential drop on the surface of a layer for a cylindrical material. Next, a. c. potential drop is measured for a specimen with a thin layer of electroplating on its surface・Finally, the inverse problem is analyzed to determine the thickness and the electromagnetic properties of the electroplated layer, where measurements of the potential drop are compared with theoretical computations. It is verified that the present method can be used for the nondestructive evaluation of the thin layer.
一般社団法人日本機械学会の論文
1994-01-25