Measurement of Material Constants for the Surface Impedance Boundary Condition Lewis, A. 2018-02-14T06:21:37.000 2020-06-30T06:38:41Z 2020-06-30T06:38:41Z Tue Jan 01 00:00:00 UTC 1991 1991
dc.description.abstract <p>The alternating current field measurement (acfm) technique of crack detection and measurement in metals is described elsewhere in these proceedings by Lugg [1] and by Dover [2]. In common with many eddy-current crack inspection probes, acfm probes are usually operated at a frequency f such that the electromagnetic skin-depth (1) δ=(μ,μ0σπf)−1/2 is much smaller than the depth of a significant crack. In this formula μr is the relative magnetic permeability of the test piece and σ its electric conductivity. Such thin-skin fields near a surface-breaking fatigue crack, with a uniform incident field, have been calculated by using a modified surface impedance boundary condition which includes a line source of magnetic flux to model the effect of the crack [3], [4].</p>
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dc.identifier archive/
dc.identifier.articleid 2749
dc.identifier.contextkey 5800411
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/1991/allcontent/77
dc.language.iso en
dc.relation.ispartofseries Review of Progress in Quantitative Nondestructive Evaluation
dc.source.bitstream archive/|||Sat Jan 15 01:52:20 UTC 2022
dc.source.uri 10.1007/978-1-4615-3742-7_77
dc.title Measurement of Material Constants for the Surface Impedance Boundary Condition
dc.type event
dc.type.genre article
dspace.entity.type Publication
relation.isSeriesOfPublication 289a28b5-887e-4ddb-8c51-a88d07ebc3f3
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