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Eddy Current Evaluation of Fatigue Crack Depths in Planar Metallic non-Ferromagnetic Materials

Ribeiro, A. L. ; Ramos, H. ; Pasadas, D. ; Rocha, T.

Eddy Current Evaluation of Fatigue Crack Depths in Planar Metallic non-Ferromagnetic Materials, Proc RELACRE - Conferência Nacional em Ensaios Não Destrutivos - CNEND, Lisboa, Portugal, Vol. Resumos, pp. 63 - 65, December, 2014.

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Abstract
his work estimates the depth of cracks using the eddy current method. After detection of one crack the material surface is scanned. The eddy currents are excited in the material using a special planar coil to produce a spatially invariant primary field. The secondary field, due to the eddy currents is measured using a high sensitivity giant magneto-resistor sensor. It is experimentally demonstrated that the maximum amplitude of the field perturbation due to the presence of a defect correlates with the depth of the crack.