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Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack
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| Zeitschriftentitel: | Journal of Applied Physics |
|---|---|
| Personen und Körperschaften: | |
| In: | Journal of Applied Physics, 76, 1994, 5, S. 3072-3080 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
AIP Publishing
|
| Schlagwörter: |
| author_facet |
Burke, S. K. Burke, S. K. |
|---|---|
| author |
Burke, S. K. |
| spellingShingle |
Burke, S. K. Journal of Applied Physics Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack General Physics and Astronomy |
| author_sort |
burke, s. k. |
| spelling |
Burke, S. K. 0021-8979 1089-7550 AIP Publishing General Physics and Astronomy http://dx.doi.org/10.1063/1.358454 <jats:p>A method for crack size determination using eddy-current nondestructive evaluation is presented for the case of a plate containing an infinitely long crack of uniform depth and uniform crack opening. The approach is based on the approximate solution to Maxwell’s equations for nonmagnetic conductors in the limit of small skin depth and relies on least-squares polynomial fits to a normalized coil impedance function as a function of skin depth. The method is straightforward to implement and is relatively insensitive to both systematic and random errors. The procedure requires the computation of two functions: a normalizing function, which depends both on the coil parameters and the skin depth, and a crack-depth function which depends only on the coil parameters in addition to the crack depth. The practical performance of the method was tested using a set of simulated cracks in the form of electro-discharge machined slots in aluminum alloy plates. The crack depths and crack opening deduced from the eddy-current measurements agree with the actual crack dimensions to within 10% or better. Recommendations concerning the optimum conditions for crack sizing are also made.</jats:p> Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack Journal of Applied Physics |
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Journal of Applied Physics |
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| title |
Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_unstemmed |
Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_full |
Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_fullStr |
Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_full_unstemmed |
Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_short |
Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_sort |
eddy-current inversion in the thin-skin limit: determination of depth and opening for a long crack |
| topic |
General Physics and Astronomy |
| url |
http://dx.doi.org/10.1063/1.358454 |
| publishDate |
1994 |
| physical |
3072-3080 |
| description |
<jats:p>A method for crack size determination using eddy-current nondestructive evaluation is presented for the case of a plate containing an infinitely long crack of uniform depth and uniform crack opening. The approach is based on the approximate solution to Maxwell’s equations for nonmagnetic conductors in the limit of small skin depth and relies on least-squares polynomial fits to a normalized coil impedance function as a function of skin depth. The method is straightforward to implement and is relatively insensitive to both systematic and random errors. The procedure requires the computation of two functions: a normalizing function, which depends both on the coil parameters and the skin depth, and a crack-depth function which depends only on the coil parameters in addition to the crack depth. The practical performance of the method was tested using a set of simulated cracks in the form of electro-discharge machined slots in aluminum alloy plates. The crack depths and crack opening deduced from the eddy-current measurements agree with the actual crack dimensions to within 10% or better. Recommendations concerning the optimum conditions for crack sizing are also made.</jats:p> |
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| container_issue | 5 |
| container_start_page | 3072 |
| container_title | Journal of Applied Physics |
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| description | <jats:p>A method for crack size determination using eddy-current nondestructive evaluation is presented for the case of a plate containing an infinitely long crack of uniform depth and uniform crack opening. The approach is based on the approximate solution to Maxwell’s equations for nonmagnetic conductors in the limit of small skin depth and relies on least-squares polynomial fits to a normalized coil impedance function as a function of skin depth. The method is straightforward to implement and is relatively insensitive to both systematic and random errors. The procedure requires the computation of two functions: a normalizing function, which depends both on the coil parameters and the skin depth, and a crack-depth function which depends only on the coil parameters in addition to the crack depth. The practical performance of the method was tested using a set of simulated cracks in the form of electro-discharge machined slots in aluminum alloy plates. The crack depths and crack opening deduced from the eddy-current measurements agree with the actual crack dimensions to within 10% or better. Recommendations concerning the optimum conditions for crack sizing are also made.</jats:p> |
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| spelling | Burke, S. K. 0021-8979 1089-7550 AIP Publishing General Physics and Astronomy http://dx.doi.org/10.1063/1.358454 <jats:p>A method for crack size determination using eddy-current nondestructive evaluation is presented for the case of a plate containing an infinitely long crack of uniform depth and uniform crack opening. The approach is based on the approximate solution to Maxwell’s equations for nonmagnetic conductors in the limit of small skin depth and relies on least-squares polynomial fits to a normalized coil impedance function as a function of skin depth. The method is straightforward to implement and is relatively insensitive to both systematic and random errors. The procedure requires the computation of two functions: a normalizing function, which depends both on the coil parameters and the skin depth, and a crack-depth function which depends only on the coil parameters in addition to the crack depth. The practical performance of the method was tested using a set of simulated cracks in the form of electro-discharge machined slots in aluminum alloy plates. The crack depths and crack opening deduced from the eddy-current measurements agree with the actual crack dimensions to within 10% or better. Recommendations concerning the optimum conditions for crack sizing are also made.</jats:p> Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack Journal of Applied Physics |
| spellingShingle | Burke, S. K., Journal of Applied Physics, Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack, General Physics and Astronomy |
| title | Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_full | Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_fullStr | Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_full_unstemmed | Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_short | Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| title_sort | eddy-current inversion in the thin-skin limit: determination of depth and opening for a long crack |
| title_unstemmed | Eddy-current inversion in the thin-skin limit: Determination of depth and opening for a long crack |
| topic | General Physics and Astronomy |
| url | http://dx.doi.org/10.1063/1.358454 |