近接端子を用いた直流電位差法による二次元傾斜き裂の非破壊評価

概要

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The object of the present study is to develop a method for enhancing the sensitivity of the DCPD technique for evaluation of length and inclination of an inclined crack on the surface of materials. A method using extremely adjacent probes is proposed for this purpose. The potential drop technique uses four probes which are a set of two probes for current input and output and another set of two probes for measuring potential drop. In the present method, potential drop measuring probes are located near the crack and current input and output probes are set close to them. Some experiments conducted on laboratory specimens validate the use of this method for nondestructive evaluation of cracks based on the utilization of a small sensor composed of the probes. It is shown that the sensitivity of the present method is higher than that of the method locating current input and output probes far from the crack.
1996-01-25