Improvement in Subsurface Fatigue Cracks under Airframes Fasteners Detection Using Improved Rotating Giant Magneto- Resistance Magnetometer Head
نویسنده
چکیده
Abstract. Improved Giant MagnetoResistance Magnetometers (IGMRM) offers many advantages for subsurface cracks detection. This paper presents new detection opportunity of fatigue cracks close to fasteners or rivets with an improved rotating head. The latter was developed around an IGMRM and a well design electromagnetic flux focuser. The capabilities of the system for the one to the third aluminum layers (3 to 4 mm thick each) flaw detection will be highlighted. Experimental Electro Discharge Machined (EDM) crack sizes under fasteners are some millimeter long and ≈ 100 μm wide. Currently, results show the ability of the system to detect very easily 7 mm long machined crack near rivet under 6 mm of aluminum. The use of IGMRM as field detector, for improved low frequency response and sensitivity of the device, is discussed. A 2D finite element modeling results of electromagnetic field distribution about this newly designed rotating probe is presented. Also, the complete system configuration is described.
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