TY - JOUR
T1 - Off-axis estimation of lay-up orientation in CFRP laminated composites using eddy current testing
AU - Xu, Xiaojuan
AU - Ji, Hongli
AU - Qiu, Jinhao
AU - Takagi, Toshiyuki
N1 - Funding Information:
This work was supported by the Major State Basic Research Development Program of China (973 Program, No. 2015CB057501), the “333” project of Jiangsu Province (No. BRA2015310), the Fundamental
Funding Information:
Research Funds of the Central Universities (Nos. NE2015001& NS2017033), the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nos. MCMS-0517K04 & MCMS-0115K01) the Six talent peaks project in Jiangsu Province (JXQC-002), the Key Project of National Natural Science Foundation of Jiangsu Province (BK20150061), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
Publisher Copyright:
© 2019 IOS Press and the authors. All rights reserved.
PY - 2019
Y1 - 2019
N2 - This paper presents a traditional eddy current testing (ET) method to estimate the off-axis of lay-up in the cross-ply and multidirectional carbon fiber reinforced polymer (CFRP) laminates. The transmitter receiver (TR) probe equipped with two identical circular coils was utilized to scan surface of the CFRPs with artificially induced off-axis layers in different depths. A 2D fast Fourier transform (2D-FFT) was applied to the C-scan experimental images for determining the layer orientation. It was observed that several highlighted lines are located at different directions in the Fourier transform images, which correspond to the higher energy and indicate a periodicity in the corresponding direction. From these images, the layer orientation with a minimum -5° off-axis was measured, and the actual fibers direction 40° can be obtained by subtracted 90° from the frequency angle in the Fourier transform image. Additionally, mechanism of the output signal change caused by the off-axis lamina was analyzed using the finite element (FE) analysis. Numerical results showed that deformation of the space magnetic field occurs because of the redistribution eddy current induced in the off-axis lamina, which implies the possibility to measure and estimate the deviated fibers orientation of the CFRPs using the traditional ET method.
AB - This paper presents a traditional eddy current testing (ET) method to estimate the off-axis of lay-up in the cross-ply and multidirectional carbon fiber reinforced polymer (CFRP) laminates. The transmitter receiver (TR) probe equipped with two identical circular coils was utilized to scan surface of the CFRPs with artificially induced off-axis layers in different depths. A 2D fast Fourier transform (2D-FFT) was applied to the C-scan experimental images for determining the layer orientation. It was observed that several highlighted lines are located at different directions in the Fourier transform images, which correspond to the higher energy and indicate a periodicity in the corresponding direction. From these images, the layer orientation with a minimum -5° off-axis was measured, and the actual fibers direction 40° can be obtained by subtracted 90° from the frequency angle in the Fourier transform image. Additionally, mechanism of the output signal change caused by the off-axis lamina was analyzed using the finite element (FE) analysis. Numerical results showed that deformation of the space magnetic field occurs because of the redistribution eddy current induced in the off-axis lamina, which implies the possibility to measure and estimate the deviated fibers orientation of the CFRPs using the traditional ET method.
KW - Eddy current testing
KW - carbon fibers
KW - electrical properties
KW - lay-up orientation
KW - off-axis
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U2 - 10.3233/JAE-171060
DO - 10.3233/JAE-171060
M3 - Article
AN - SCOPUS:85063316058
VL - 59
SP - 1195
EP - 1202
JO - International journal of applied electromagnetics in materials
JF - International journal of applied electromagnetics in materials
SN - 1383-5416
IS - 4
ER -