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Finite element model of natural crack in eddy current testing problem

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2 Author(s)
Tanaka, M. ; Dept. of Inf. Eng., Fukuyama Univ., Japan ; Tsuboi, Hajime

Eddy current testing (ECT) is one of the nondestructive inspection techniques to detect cracks and eddy current analysis is important for ECT. However, it is difficult to model a natural crack in finite element method (FEM), because of the narrow gap and the complex shape. In this paper, a finite element model for the natural crack is proposed. The conductivity for the finite element model is expressed by a tensor. In the proposed finite element, the change in crack shape and contact condition are simulated by changing the coefficients of the conductivity tensor. The proposed model is applied to a conductor plate model with a crack and a coil. The computation results are compared with the computation results of an artificial crack model. The validity of the proposed method is shown by the computation results

Published in:

Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 5 )