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Experimental Investigation of Bonding Quality for CFRP Bonded Structures with Thick Adhesive Layers Based on Ultrasonic Transmission Coefficient Spectrums

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Abstract

The experimental study of ultrasonic transmission coefficient measurement method was carried out for the problem of bonding quality inspection of bonded structures of composites with thick adhesive layer. For the uniaxial CFRP bonded specimens, the ultrasonic waves’ phase velocity distribution and the ultrasonic transmission coefficient spectrums were measured by the water-immersion ultrasonic transmission method. Then their complex elastic constants were inversed by the particle swarm optimization algorithm based on simulated annealing. Based on this, CFRP bonded specimens in perfect bonding status and having single weak bonding interface, dual weak bonding interfaces were manufactured. Then the ultrasonic transmission coefficient spectrums were measured, and the distinction of bonding quality between different bonding specimens was predicted. At the same time, according to the shift characteristics of the measured ultrasonic transmission coefficient spectra, the influence of the symmetry of the CFRP bonded structures with thick adhesive layers on the ultrasonic transmission coefficient spectrums was investigated experimentally. In addition, by comparing the time-domain and coefficient spectra characteristics of transmitted waves, the advantage of using the coefficient spectrum measurement method in bonding quality detection was expounded.

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The data used in this research is available on reasonable request.

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Acknowledgements

This study is financially supported by the National Natural Science Foundation of China.

Funding

National Natural Science Foundation of China (Grant Nos. 11972052, 12172016).

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Authors and Affiliations

  1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China

    Yongkun Li & Zeqi Bian

  2. Faculty of Information Technology, Beijing University of Technology, Beijing, 100124, China

    Yan Lyu, Bin Wu, Jie Gao & Cunfu He

  3. China Electric Power Research Institute, Beijing, 100192, China

    Yongkun Li

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  1. Yongkun Li
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  2. Yan Lyu
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Contributions

The research was raised by YL, YL and other co-authors. And the research work was also conducted by YL, YL, who played a major part in the development of the method mentioned in this manuscript. YL and YL carried out the theoretical derivation, developed the relative programs, together with the main writing of this manuscript. JG and ZB put forward many constructive suggestions for the development of the approach, and established an experimental system to inspect the results of theoretical calculations. BW and CH joined the discussion for the development of the method, and offered some useful proposals. All authors reviewed the manuscript.

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Correspondence to Yan Lyu.

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Li, Y., Lyu, Y., Wu, B. et al. Experimental Investigation of Bonding Quality for CFRP Bonded Structures with Thick Adhesive Layers Based on Ultrasonic Transmission Coefficient Spectrums. J Nondestruct Eval 43, 17 (2024). https://doi.org/10.1007/s10921-023-01029-6

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