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Ultrasonic pulse signal resonance features in layered CFRP within voids

  • Organic materials
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Abstract

The ultrasonic pulse signal resonance features in layered carbon fiber reinforced plastic (CFRP) within voids were researched. The frequency domain model of acoustic wave propagation in multilayered medium was established. Then the reflection coefficient of multilayered CFRP within voids was numerically calculated. The results are as follows. When the CFRP laminate is tested by ultrasonic whose center frequency is close to the CFRP inherent resonant frequency, the ultrasonic may generate resonance phenomenon in CFRP. If CFRP contains evenly distributed voids, the frequency of resonant signal and its amplitude all decrease with the increase of porosity. For the thick section CFRP within local concentrated voids, the local concentrated voids near testing surface will cause signal frequency reduction and the decrease of its amplitude. But the voids which exist in layers far away from testing surface almost have no influence on signal resonance. The ultrasonic pulse echo testing was conducted for thick section CFRP specimen. The analysis results of testing signals were in accordance with the results of the numerical calculation, showing that the reflection coefficient frequency response model can effectively explain the ultrasonic resonance phenomenon in layered CFRP within voids.

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Authors and Affiliations

  1. The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Chenlong Yang  (杨辰龙), Yuechao Chen  (陈越超) & Zhe Wang

  2. Hangzhou Applied Acoustic Research Institute, Science and Technology on Sonar Laboratory, Hangzhou, 310023, China

    Yuechao Chen  (陈越超)

  3. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou, 310018, China

    Huifeng Zheng

Authors
  1. Chenlong Yang  (杨辰龙)
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  2. Yuechao Chen  (陈越超)
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  3. Zhe Wang
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  4. Huifeng Zheng
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Corresponding author

Correspondence to Yuechao Chen  (陈越超).

Additional information

Funded by the National Natural Science Foundation of China (Nos.5161101582 and 51575541), Zhejiang Provincial Natural Science Foundation of China (No. LY15E050012) and Zhejiang Provincial Public Projects on Industrial Technology (No. 2015C31052)

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Yang, C., Chen, Y., Wang, Z. et al. Ultrasonic pulse signal resonance features in layered CFRP within voids. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 32, 695–702 (2017). https://doi.org/10.1007/s11595-017-1654-2

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  • DOI: https://doi.org/10.1007/s11595-017-1654-2

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