Affiliations: [a] School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu, China | [b] School of Electric and Automation Engineering, Nanjing Normal University, Nanjing, China | [c] State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, China | [d] Institute of Fluid Science, Tohoku University, Sendai, Japan
Correspondence:
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Corresponding author: Jun Cheng, School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, China; School of Electric and Automation Engineering, Nanjing Normal University, Nanjing 210023, China. E-mail: chengjun@njnu.edu.cn
Abstract: In carbon fiber reinforced plastic (CFRP) composite, the alignment of continuous carbon fibers guides the directional flow of eddy currents, which is beneficial to the structural and damage detection. In this study, for the purpose of impact damage repair, the transmitter-receiver (T-R) and the flat-tangent eddy current probes are used to determine the fiber orientations and stacking sequence in the CFRP laminate by surface scanning. Theoretical analysis shows that the T-R probe can flexibly pick up the magnetic field generated by the stretched eddy current in CFRP layers. In the meanwhile, the flat-tangent probe possesses layer selective characteristics. By calculating the fiber distribution images of individual directions based on two-dimensional fast Fourier transform (2D-FFT) and comparing the order of pixel intensity values of these images, the fiber orientation and the stacking sequence in the laminate plates can be obtained simultaneously, which provides guidance for damage detection and repair of the CFRP structures.
Keywords: Eddy current testing, carbon fiber reinforced plastic, directionality measurement, image processing, two-dimensional fast Fourier transform
