The purpose of this program was to develop a reproducible, highly sensitive novel eddy current probe applying the technique of ferromagnetic resonance (FMR). The method developed must be suited to inspect test objects where access may be limited, for example bolt holes of turbine engine disks. This program studied the FMR probe in both its passive and active modes. An active probe was developed and tested that demonstrated that the FMR technique is a practical approach for inspection of metallic aerospace components. The program consisted of three tasks. In Task 1 the theoretical analysis and modeling was performed by Stanford University under subcontract with Battelle. This analysis and modelling served as a guide in probe design concepts for Battelle's experimental evaluation, which was performed in Task 2. Finally, a demonstration, comprising Task 3, was performed for Air Force Materials Laboratory personnel at Battelle's facility in which five FMR probes of the same design were tested. The results of the demonstration confirmed the FMR probe design's reproducibility and repeatable high sensitivity for detecting flaws located in a titanium bolt-hole specimen.
Research to develop and evaluate advanced eddy current sensors for detecting small flaws in metallic aerospace components
Entwicklung und Pruefung eines fortschrittlichen Wirbelstrompruefverfahrens fuer die Ortung kleiner Fehler in Metallteilen von Raumflugzeugen
US Government Reports ; Dez ; 1-101
1982
101 Seiten
Report
Englisch
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