SCANNING AND IMAGING OF GFRP PLATES BY AIR-COUPLED ULTRASONIC LAMB WAVE

Abstract

Abstract: Aiming at the Air-coupled ultrasonic Lamb wave, a probability imaging method independent of signal velocity was used to study the multiple types of defects in Glass Fiber Reinforced Plate (GFRP). Firstly, the single mode Lamb waves are excited and received on the same side of the GFRP with an air-coupled probe, and the probe is scanned in two orthogonal directions. Then, we intercept the direct defect signal received by each scanning path and carry out Fast Fourier Transform (FFT). After obtaining the energy in the frequency domain, the relative difference between the energy in the frequency domain and the reference signal is defined as the energy damage factor. Finally, the energy damage factors of each scanning path were combined with the probability damage principle to conduct imaging of different types of defects, and the imaging results were compared with the results of air-coupled C-Scan. The results show that the imaging method based on the air-coupled Lamb wave can effectively localize and quantify multiple types of defects in GFRP.

Key words: GFRP, air-couple Lamb wave, damage index, probability imaging

CLC Number:

TB332

CHANG Jun-jie, WAN Tao-lei, WU Jun, ZENG Xue-feng. SCANNING AND IMAGING OF GFRP PLATES BY AIR-COUPLED ULTRASONIC LAMB WAVE[J]. Composites Science and Engineering, 2020, 0(4): 46-52.

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