Research of layered CFRP ultrasonic resonance characteristics based on reflection coefficient modeling

CHEN Yue-chao1 YANG Chen-long1 ZHOU Xiao-jun1 ZHENG Hui-feng2

Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (12) : 147-154.

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PDF(2938 KB)
Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (12) : 147-154.

Research of layered CFRP ultrasonic resonance characteristics based on reflection coefficient modeling

  • CHEN Yue-chao1   YANG Chen-long1   ZHOU Xiao-jun1  ZHENG Hui-feng2
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Abstract

The ultrasonic reflection coefficient model for layered carbon fiber reinforced polymer (CFRP) was built and the characteristics of ultrasonic resonance in CFRP were studied. First the reflection coefficient frequency response model of acoustic wave propagation in multilayered medium was established. Then the frequency response of multilayered CFRP reflection coefficient was numerically calculated based on the model and the influence of CFRP layer number to frequency response characteristics was analyzed. The results are as follows. When the ultrasonic probe whose center frequency is close to the resonant frequency of layered CFRP is used to test the CFRP, the ultrasonic wave resonance phenomenon will appear. If the layer number of CFRP is small, the resonance structure noise will be mixed with signal components of other frequencies. With the increase of CFRP layer number, the proportion of resonance structure noise in signal resonance region will increase. When the CFRP layer increases to a certain number, the resonance structure noise will only appear in the region close to the ultrasonic incidence surface. As the ultrasonic spread away from the incidence surface, the resonant structure signal will gradually disappear. At last the experimental signals of thin plate CFRP and thick section CFRP were analyzed respectively. The experimental results were the same as the numerical calculation results.

Key words

carbon fiber reinforced polymer / ultrasonic pulse-echo signal / reflection coefficient / frequency response / resonance

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CHEN Yue-chao1 YANG Chen-long1 ZHOU Xiao-jun1 ZHENG Hui-feng2. Research of layered CFRP ultrasonic resonance characteristics based on reflection coefficient modeling[J]. Journal of Vibration and Shock, 2016, 35(12): 147-154

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