Eddy Current for Detecting Second Layer Cracks Under Installed Fasteners

The detection of second layer Cracks Under Fasteners (CUF) persists as an Air Force Logistics need. This work seeks to extend technology developed for detecting cracks in aluminum alloy substructure below graphite-epoxy skins, to structures with an aluminum first layer. Improvements to the design of...

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Bibliographische Detailangaben
1. Verfasser:	Sheppard, William R
Format:	Report
Sprache:	eng
Schlagworte:	AIR FORCE ALGORITHMS ALUMINUM ALLOYS Attack and Fighter Aircraft COILS CONFIGURATIONS CRACKS DEFECTS(MATERIALS) EDDY CURRENTS Electricity and Magnetism F/A-18 AIRCRAFT FASTENINGS FATIGUE(MECHANICS) FIGHTER AIRCRAFT GRAPHITE EPOXY COMPOSITES LOGISTICS LOW FREQUENCY MAGNETIC FIELDS MILITARY AIRCRAFT NOISE NONDESTRUCTIVE TESTING PE62102F PROBES SKIN(STRUCTURAL) WUWL24180252
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Beschreibung
Zusammenfassung:	The detection of second layer Cracks Under Fasteners (CUF) persists as an Air Force Logistics need. This work seeks to extend technology developed for detecting cracks in aluminum alloy substructure below graphite-epoxy skins, to structures with an aluminum first layer. Improvements to the design of the Northrop Low Frequency Eddy Current Array (LFECA) system are identified to improve sensitivity to CUFs in aluminum-over-aluminum structures. The probe core shape, dimensions, and coil configurations were optimized for detection with installed fasteners and metallic skin. A multiparameter analysis algorithm is applied to enable flaw discrimination from centering variations, edge responses and other sources of noise. The study also quantifies the capabilities and limitations of the LFECA system. Eddy current, Low frequency eddy current, Cracks, CUFs, Nondestructive Evaluation (NDE).