Pulsed Eddy Current (PEC) characterization of material loss in multi-layer structures


  1. Giguere, S.
  2. Lepine, B.A.
  3. Dubois, J.M.S.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Visual inspection is currently the primary means for detecting corrosion in fuselage multi-layered aircraft structures, such as lap splices. This method detects the surface deformation that arise between the rivers (i.e., pillowing) due to the increased volume of the corrosion products between the plates. Enhanced visual inspection methods, generally based on the same principle, provide a more reliable and sensitive means of detecting corrosion and monitoring its condition over time. Deformation not due to corrosion, such as poor quality control during manufacture or previous repairs, however, can give false indications. In addition, as corrosion becomes more of a structural integrity issue, there is the need for more quantitative assessment capabilities in nondestructive evaluation. Recent advances in the pulsed eddy current technique have shown the potential to give a new tool to characterize the material loss in a multi-layer structure. This technique provides the ability to assess a large number of parameters including defect size and its depth location, in a way far superior to that achievable with conventional eddy current instruments and techniques. This paper will present the current capabilities and developments of the pulsed eddy current technique applied to fuselage lap splices inspections.
Multi-layer structures;Lap splice;Pulsed eddy current;Transient response
Report Number
DCIEM-SL-2000-064 — Scientific Literature
Date of publication
31 Aug 2000
Number of Pages
Reprinted from
Canadian Aernautics and Space Journal, vol 46, no 4, 2000, p 204-208
Hardcopy;Document Image stored on Optical Disk

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