Research to Develop and Evaluate Advanced Eddy Current Sensors for Detecting Small Flaws in Metallic Aerospace Components.
Final technical rept. 20 Sep 80-31 Jul 82,
BATTELLE PACIFIC NORTHWEST LABS RICHLAND WASH
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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 I the theoretical analysis and modeling was performed by Stanford Universtiy under subcontract with Battelle. This analysis and modelling served as a guide in probe design concepts for Battelles experimental evaluation, which was performed in Task II. Finally, a demonstration, comprising Task III, was performed for Air Force Materials Laboratory personnel at Battelles facility in which five FMR probes of the same design were tested. The results of the demonstration confirmed the FMR probe designs reproducibility and repeatable high sensitivity for detecting flaws located in a titanium bolt-hole specimen. Author
- Test Facilities, Equipment and Methods
- Jet and Gas Turbine Engines