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Integral Equation Method for Evaluation of Eddy-Current Impedance of a Rectangular, Near Surface Crack Inside a Cylindrical Hole

Lars Larsson (Institutionen för material- och tillverkningsteknik, Avancerad oförstörande provning) ; Anders Boström (Institutionen för tillämpad mekanik, Dynamik)
Journal of Nondestructive Evaluation (0195-9298). Vol. 35 (2016), 2,
[Artikel, refereegranskad vetenskaplig]

An integral equation method for solving the eddy-current nondestructive evaluation problem of a flat, rectangular, near surface crack inside of a cylindrical hole in a conducting material is presented. The method involves expanding the Green’s tensor, the incoming field, and the jump in electric potential over the crack in suitable basis functions. Here, plane waves, cylindrical waves, and basis functions related to the Chebyshev polynomials, are used. The way of discretization in this method leads to a formulation where the scattering is defined by a scattering matrix, independent of the incoming field. This presents an advantage, when conducting numerical simulations, since the scattering matrix does not have to be recalculated for every probe position. The numerical calculations are straightforward to perform and model predictions are compared with finite element results.

Nyckelord: Chebyshev polynomials , Eddy-current , Nondestructive evaluation , Surface integral equation



Denna post skapades 2016-05-11. Senast ändrad 2016-12-07.
CPL Pubid: 236298

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Avancerad oförstörande provning (2005-2017)
Institutionen för tillämpad mekanik, Dynamik (1900-2017)

Ämnesområden

Materialteknik

Chalmers infrastruktur