Finite Element Model study of the Effect of Corner Rounding on Detectability of Corner Cracks using Bolt-Hole Eddy Current

dc.contributor.author Underhill, P.
dc.contributor.author Krause, T.
dc.date 2018-02-17T22:47:53.000
dc.date.accessioned 2020-06-30T06:53:09Z
dc.date.available 2020-06-30T06:53:09Z
dc.date.issued 2016-01-01
dc.description.abstract <p>Recent work has shown that the detectability of corner cracks in bolt-holes is compromised when rounding of corners arises, as might occur during bolt-hole removal. Probability of Detection (POD) studies normally require a large number of samples of both fatigue cracks and electric discharge machined notches. In the particular instance of rounding of bolt-hole corners, the generation of such a large set of samples representing the full spectrum of potential rounding would be prohibitive. In this paper, the application of Finite Element Method (FEM) modeling is used to supplement the study of detection of cracks forming at the rounded corners of bolt-holes. FEM models show that rounding of the corner of the bolt-hole reduces the size of the response to a corner crack to a greater extent than can be accounted for by loss of crack area. This reduced sensitivity can be ascribed to a lower concentration of eddy currents at the rounded corner surface and greater lift-off of pick-up coils relative to that of a straight-edge corner. A rounding with a radius of 0.4 mm (.016 inch) showed a 20% reduction in the strength of the crack signal. Assuming linearity of the crack signal with crack size, this would suggest an increase in the minimum detectable size by 25%. Modeling results are consistent with measurements performed on cracks grown on bolt-hole samples extracted from service.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/qnde/2016/abstracts/183/
dc.identifier.articleid 4970
dc.identifier.contextkey 9252072
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/2016/abstracts/183
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/61931
dc.language.iso en
dc.relation.ispartofseries Review of Progress in Quantitative Nondestructive Evaluation
dc.source.bitstream archive/lib.dr.iastate.edu/qnde/2016/abstracts/183/178_Finite_Element.pdf|||Fri Jan 14 21:39:55 UTC 2022
dc.subject.disciplines Electrical and Computer Engineering
dc.subject.disciplines Electromagnetics and Photonics
dc.subject.disciplines Numerical Analysis and Computation
dc.subject.disciplines Partial Differential Equations
dc.title Finite Element Model study of the Effect of Corner Rounding on Detectability of Corner Cracks using Bolt-Hole Eddy Current
dc.type event
dc.type.genre event
dspace.entity.type Publication
relation.isSeriesOfPublication 289a28b5-887e-4ddb-8c51-a88d07ebc3f3
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