JEC COMPOSITES MAGAZINE - Issue #145 - April/May 2022 - 99

ln-service inspection of damage in composite structures
Conclusion
The frequency spectrum of each AE burst recorded was retrieved using fast
Fourier transforms. The peak frequency of each AE event was represented
as a function of the number of hits recorded, on the same diagram. This approach
gives a global view of the frequency spectrum encountered during
the entire mechanical test. Subsequently, the significant frequencies on the
frequency-hits diagram were paired with the damage modes observed for
each specimen, taking into account all the results obtained in this testing
campaign. The use of standardised mechanical tests in controlled conditions
resulted in a high repeatability in terms of damage modes induced
and values. By diversifying the loading configurations, the present study
made it possible to identify the AE signal frequency for multiple types of
damage modes incurred by composite materials during their service life.
To conclude, this testing campaign proved the utility of using AE signal
frequency analysis to characterise damage in composite materials. Further
work will be conducted to support these conclusions.
More information:
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Acknowledgements
Cybernetix Compiègne is a Technip Energies company that specializes
in acoustic emission created under the name of AETECH more than
25 years ago. The company contributed to several complex projects
in various energy domains. The work presented in this paper would
not have been possible without the dedication, knowledge and
expertise of the current and former Cybernetix Compiegne team.
The authors especially thank Anh Tuan Do, TechnipFMC's Principal
Composite Expert, who strongly contributed to the value of this work
and paper.
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