Determination of Surface Crack Configuration by DC Potential Drop Method Assisted by Three-Dimensional Boundary Fitted Coordinates Transformation Technique

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  • HAYASHI Makoto
    Neutron Science Center, Comprehensive Research Organization for Science and Society

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  • 3次元Boundary Fit変換法を援用した直流ポテンシャル法による表面き裂形状の同定
  • 3ジゲン Boundary Fit ヘンカンホウ オ エンヨウ シタ チョクリュウ ポテンシャルホウ ニ ヨル ヒョウメン キレツ ケイジョウ ノ ドウテイ

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Abstract

<p>DC potential drop method enables to determine surface crack configurations. A batch processing program for the determination of surface crack configuration by DC potential drop method has been developed. The production of the mesh element has been considerably improved by the introduction of a three dimensional boundary fitted coordinates transformation technique. The curved grid can be automatically changed to correspond to the actual crack shape. The program is available for the plate like material and the pipes with the surface crack. The results of application to the simulated surface crack showed good agreement between the analyzed crack configuration and the actual one with an accuracy of about 0.1mm.</p>

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