Inspection of impact damage on CFRP by lock-in induction thermography

Ting Liu; Yu Zhang; Udo Netzelmann; Jianguang Guo; Wang Zhang

doi:10.1117/12.2549987

20 December 2019 Inspection of impact damage on CFRP by lock-in induction thermography

Ting Liu, Yu Zhang, Udo Netzelmann, Jianguang Guo, Wang Zhang

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 1120954 (2019) https://doi.org/10.1117/12.2549987
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

Abstract

In this paper, carbon fiber reinforced polymer (CFRP) is tested using lock-in thermography, which is excited by an induction coil. A impact-damaged CFRP plate was available and measured as a function of the angle between a linear excitation coil and the main fiber directions. The amplitude and phase images of high signal-to-noise ratio (SNR) was obtained by Fast Fourier Transform (FFT). The relationship between angle sensitivity of included angle and crack shape is analyzed. The results show that the circular symmetry is basically maintained when the defect is linear. When the structure of defects is similar to that of bifurcated trees, the angular distribution is quite different, which are consistent with the results of X-ray imaging.

Citation Download Citation

Ting Liu, Yu Zhang, Udo Netzelmann, Jianguang Guo, and Wang Zhang "Inspection of impact damage on CFRP by lock-in induction thermography", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120954 (20 December 2019); https://doi.org/10.1117/12.2549987

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