Study on frequency response of chirp-excited Lamb wave in the localization of delamination damage in CFRP plate

doi:10.19936/j.cnki.2096-8000.20251128.004

Abstract

Abstract: Most current Lamb wave testing methods use a windowed narrow-band signal as the excitation signal to suppress the dispersion and facilitate the subsequent signal interpretation. A suitable center frequency should be selected to improve the signal-to-noise ratio during the measurement. However, the optimal detection frequency of the narrow-band signal often needs to be measured by several repeated experiments. A method for detecting delamination defects in carbon fiber reinforced composite plate is proposed, using a chirp signal as the excitation, which contains a broad frequency range, making more information contained in a single inspection. The narrow-band response of a series of frequencies is extracted using inverse convolution, and the optimal test frequency is selected for defect localization. It is verified by finite element simulation and experiment that the decomposed signal and the signal obtained from the direct excitation of the narrow-band signal are basically in agreement. The improved elliptical imaging algorithm is utilized for localization, and the effectiveness of the proposed method is verified experimentally.

Key words: Lamb waves, carbon fiber reinforced composites, delamination defects, chirp signal, defect localization

CLC Number:

TB332

WU Yilun, FENG Bo. Study on frequency response of chirp-excited Lamb wave in the localization of delamination damage in CFRP plate[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(11): 30-39.

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