渦電流探傷問題の有限要素解析のための亀裂近似モデル

概要

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Eddy current testing (ETC) is one of the nondestructive inspection techniques to detect crack, and eddy current analysis is important for the development of ETC systems. It is difficult to model a natural crack in finite element method, because of the narrow gap and the complex shape. The number of finite elements to model the natural crack increases remarkably with complexity of the crack shape, and a large amount of the computer resources is necessary to compute the eddy current distributions. In this paper, a finite element model for approximation of the crack in the ETC problems is proposed. The anisotropic conductivity is introduced for the finite element method based on the hexahedral edge element. The complex shape of the crack is expressed by changing the coefficients of the conductivity. Therefore, the accurate finite element model for the crack is not necessary. The validity of the proposed model is verified by comparing both the numerical results and the experimental results.
福山大学の論文