マルチターミナルポテンシャル法による片側貫通き裂の検出に関する有限要素法による検討

概要

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The direct current potential drop method for on-line monitoring of side edge cracks was studied. In a plate with a single edge crack, the measured potential difference varies with crack position. Based on the distinctive distribution of potential difference, a multi-terminal DC potential technique was proposed for detecting crack length and position. In this technique, many potential difference measuring electrodes with the same spacing are fixed on the plate side. By comparing the many potential differences, the crack length and position can be calculated. The electrical field was analyzed by FEM, and the calibration curve and sensitivity were examined. The analyzed potential differences were classified based on the position. V_1 is the potential difference between the electrode pair with a crack. V_2 and V_3 are the potential differences between electrode pairs without a crack, and are on either side of the V_1 obtained electrode pair. V_2 is closer to the crack than V_3. V_0 is the reference potential difference obtained by averaging the potential differences except V_1, V_2 and V_3. The analysis shows that the potential difference ratio(V_1+V_2-V_0)/V_0 gives the accurate crack length, the difference of V_2 and V_3 gives the accurate crack position, and the sum of V_2 and V_3 gives the side on which the crack exists, that is, the surface or reverse-face.
社団法人日本材料学会の論文
1995-02-15