Buried Crack Detection in Aircraft Multi-layer Structure Based on Pulsed Eddy Current
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.
Dual polarity low-frequency pulse excitation Time slice Array Imaging scan
Sheng Lai Hu Chen Yuewen Fu
Ningbo special equipment inspection & research institute, Ningbo, China Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University,Nancha
国际会议
济南
英文
536-541
2013-05-18（万方平台首次上网日期，不代表论文的发表时间）