Investigation on Influence of PRFECT Probe Position on Detection Coil of Aircraft Riveted Components

• Published in: Journal of nondestructive evaluation 2022-09, Vol.41 (3), Article 51
• Main Authors: Song, Kai, Fang, Zhihong, Li, Zixuan, Wang, Libo, He, Xipeng, Cui, Ximing
• Format: Article
• Language: English
• Subjects: Air gaps; Aircraft; Aircraft detection; Amplitudes; Characterization and Evaluation of Materials; Classical Mechanics; Coils; Control; Defects; Dynamical Systems; Eddy current testing; Eddy currents; Engineering; Interlayers; Magnetic flux; Skin effect; Solid Mechanics; Ultrasonic testing; Vibration
• ISSN: 0195-9298; 1573-4862
• DOI: 10.1007/s10921-022-00881-2

The interlayer air gap of riveted components has less impact on the planar remote field eddy current testing (PRFECT) technology, compared with ultrasonic testing. PRFECT technology breaks through the limitation of skin effect and is suitable for the detection of deep hidden defects in the metal riveted components of the aircraft. Aiming at the PRFECT of aircraft metal riveted components, the PRFECT model is established when the detection coil is offset from the rivet center. The distribution law of magnetic field intensity in riveted components is analyzed. The offset distance of detection coil from the rivet center is optimized within the allowable range of adjacent rivet spacing. The influence of different sector defect radius on the offset distance of detection coil is compared and the detection signal characteristics of different buried depth defects are studied. The simulation and test results show that when the offset distance between the detection coil and the rivet center decreases from 15 to 7 mm, the amplitude of defect detection signal increases first and then decreases, and the signal amplitude reaches the peak when the offset distance is about 12 mm. The optimized probe can detect sector-shaped notch defects with a buried depth of 9 mm and a radius × width × depth of 5 × 0.2 × 3 mm, and the hidden defects can be located and quantitatively evaluated by the amplitude and phase of the detection signal.