Hole crack damage detection of CFRP plate based on super-magneto-strictive transducer

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 202-210.

WANG Xiaoyu1, LIU Hailong1, GAO Sijia1, LI Jian2

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Abstract

Hole crack damage is the main damage form of carbon fiber reinforced plastics (CFRP) plate in service.Due to the anisotropy of CFRP material, ultrasonic guided wave signals are greatly attenuated and multiple mode wave packets are overlapped, so it is difficult to realize the quantitative detection of hole crack damage of CFRP bolted or riveted.Here, aiming at the damage quantification of CFRP hole cracks, Galfenol transducer was developed as the high-energy excitation source of ultrasonic guided wave, and PZT-5 was used as the receiving end to detect ultrasonic guided wave of hole cracks.The dynamic model of transducer was established, and the optimal excitation frequency was determined with the sweep frequency method combined with S0 mode capture comparison.Wavelet decomposition and short-time Fourier transform (STFT) were performed for the obtained ultrasonic guided wave signals, and the color threshold of the control cloud chart was calculated to highlight information of S0 mode and damage mode, and obtain the time-frequency cloud atlas.The mechanical model of CFRP plate was established, and the natural periodicity of Floquet boundary was adopted to gain the dispersion curve through scanning plate element wavelength Brillouin region.The time-domain location of crack damage was obtained by calculating the group velocity of dispersion curve on the cloud atlas.According to the threshold chromaticity of cloud atlas, the amplitude of wave packet was quantized, and the information of damage degree was obtained.The experimental results showed that there is a good discernibility between crack damage mode and the original mode; according to the obtained dispersion curve, the time errors for S0 mode to directly reach and reflect are 2.3 μ s and 0.6 μ s, respectively.

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carbon fiber reinforced plastics (CFRP) plate / ultrasonic guided wave / Galfenol / hole crack / super-magneto-strictive transducer

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WANG Xiaoyu1, LIU Hailong1, GAO Sijia1, LI Jian2. Hole crack damage detection of CFRP plate based on super-magneto-strictive transducer[J]. Journal of Vibration and Shock, 2020, 39(23): 202-210

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