## A General Boundary Integral Equation Approach to Eddy Current Crack Modeling

 dc.contributor.author Chao, J. dc.contributor.author Nakagawa, Norio dc.contributor.author Raulerson, D. dc.contributor.author Moulder, J. dc.date 2018-02-14T07:50:42.000 dc.date.accessioned 2020-06-30T06:47:54Z dc.date.available 2020-06-30T06:47:54Z dc.date.copyright Wed Jan 01 00:00:00 UTC 1997 dc.date.issued 1997 dc.description.abstract

Eddy current techniques have been widely used in the NDE inspection of aircraft engine components. Depending on the flaw characteristics and specimen composition, various EC probe designs have been employed to achieve the maximum probability of detection (POD). Traditionally, the effectiveness of a probe design for a given inspection is determined experimentally. In particular, parameters such as probe types, operating frequency, scan spacing, etc. are evaluated experimentally in terms of POD. It is obvious that this is a costly way of defining inspection parameters. A more cost-effective alternative is to evaluate the test parameters through the use of numerical simulation. This can be done by casting the entire EC inspection process in terms of a numerical model governed by a set of integral equations. By computing the solutions to the integral equations, outputs in the form of impedance changes due to flaws can be used to generate the POD. Previously, we have introduced a modified version of the Hertzian magnetic potential approach for eddy current probe design [1]–[3]. In those papers, it was shown that the formulation can be used to solve problems with arbitrary geometries including geometrical singularities such as edges and corners. In the present paper, we have modified the boundary integral equations (BIEs) formulation for computing the impedance change in the presence of ideal tight cracks. Some unique features of this model include the allowance for arbitrarily shaped air core probes and test components that include singular geometries.

dc.format.mimetype application/pdf dc.identifier archive/lib.dr.iastate.edu/qnde/1997/allcontent/36/ dc.identifier.articleid 3487 dc.identifier.contextkey 5810075 dc.identifier.s3bucket isulib-bepress-aws-west dc.identifier.submissionpath qnde/1997/allcontent/36 dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/61180 dc.language.iso en dc.source.bitstream archive/lib.dr.iastate.edu/qnde/1997/allcontent/36/1997_ChaoJ_GeneralBoundary.pdf|||Fri Jan 14 23:46:18 UTC 2022 dc.source.uri 10.1007/978-1-4615-5947-4_36 dc.subject.disciplines Electromagnetics and Photonics dc.subject.keywords CNDE dc.title A General Boundary Integral Equation Approach to Eddy Current Crack Modeling dc.type event dc.type.genre article dspace.entity.type Publication
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