Finding a crack's position and its parameters on the basis of non-destructive testing, using eddy currents

• Marko Jesenik ^[1] ; Anton Hamler ^[1] ; Milos Bekovic ^[1] ; Mladen Trlep ^[1]
  1. [1] University of Maribor

     University of Maribor

     Eslovenia

     
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 33, Nº 6 (Special Issue: Theoretical Electrical Engineering), 2014, págs. 1978-1989
• Idioma: inglés
• Enlaces
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• Resumen

  • Purpose – The purpose of this paper is to find the geometry of a crack within a conductive plate and its parameters, on the basis of non-destructive testing, using eddy currents. The input data represents the measured values of magnetic flux density within the centre of the excitation coil.

    Design/methodology/approach – The position of a crack can be determined by taking into consideration any change in the magnetic flux density between the measured points. The depth and width are determined through the use of a finite element model.

    Findings – These calculations are the basis for determining a function that explains how magnetic flux density changes if the depth or width has changed. Jacobi's matrix is calculated using the determined functions’ analytical derivatives.

    Originality/value – After wards, through the Newton-Raphson iterative procedure using the finite element method calculation results, the crack-depth and width can be obtained, this being one of the objectives in this paper. The suitability of the presented method was verified by the experimental example.