Abstract
The present study provides a concise description of wave propagation in cellular sandwich panels. A novel approach of damage detection based on mode conversion is proposed which can be useful for detecting relatively small damages in cellular sandwich structures using high frequency guided waves. The new methodology applies the continuous wavelet transform (CWT) and the cosine formula to extract the damage location from the time signal of displacements. Experiments conducted on a honeycomb and a metallic hollow sphere sandwich plate highlight the feasibility of the novel technique.
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Acknowledgements
By means of this, the authors acknowledge the German Research Foundation for the financial support (GA 480/13-3). We would also like to thank Dr.-Ing. C. Willberg and Dr.-Ing. S. Ringwelski for their invaluable help in the execution of the experimental tests and Hollomet GmbH is also highly appreciated for providing the hollow sphere sandwich panel.
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Hosseini, S.M.H., Duczek, S. & Gabbert, U. Damage Localization in Plates Using Mode Conversion Characteristics of Ultrasonic Guided Waves. J Nondestruct Eval 33, 152–165 (2014). https://doi.org/10.1007/s10921-013-0211-y
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DOI: https://doi.org/10.1007/s10921-013-0211-y