Buried Crack Detection in Aircraft Multi-Layer Structure Based on Pulsed Eddy Current

Abstract:

The fatigue cracks of key parts, as one of the main damages of multilayer structure in aircraft, are important objects for aircraft structural health monitoring. Conventional electromagnetic testing which uses sinusoidal signal is high sensitive to surface cracks, but it is typically difficult to measure or predict embedding cracks. A novel electromagnetic detection technique is proposed in this paper, and dual polarity low-frequency pulse is used to excite the coil. A time-domain analysis method called time-slice is utilized to obtain the transient amplitude matrix from array signal. Good results have been presented by such dynamic imaging of simulating buried cracks in multi-layer riveted structure. Experimental results show that the new electromagnetic testing has the advantages of hidden defects detection and rapid detection, and it can effectively detect buried defects in multilayer structures of aircraft, and determine damage position.

• Periodical: Applied Mechanics and Materials (Volume 330)
• Pages: 536-541
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.330.536
• Online since: June 2013
• Authors: Sheng Lai, Hu Chen, Yue Wen Fu
• Keywords: Array, Dual Polarity Low-Frequency Pulse Excitation, Imaging Scan, Time Slice

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