Journal
CHINESE PHYSICS B
Volume 29, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/ab81f7
Keywords
Lamb waves; higher harmonics; time reversal; damage location
Categories
Funding
- National Key Research and Development Program of China [2016YFF0203000]
- State Key Program of the National Natural Science Foundation of China [11834008]
- National Natural Science Foundation of China [11774167]
- State Key Laboratory of Acoustics, Chinese Academy of Sciences [SKLA201809]
- Science Fund from the Key Laboratory of Underwater Acoustic Environment, Chinese Academy of Sciences [SSHJ-KFKT-1701]
- Natural Science Fund for AQSIQ Technology Research and Development Program, China [2017QK125]
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A promising tool to detect micro-cracks in plate-like structures is used for generating higher harmonic Lamb waves. In this paper, a method combining nonlinear S(0)mode Lamb waves with time reversal to locate micro-cracks is presented and verified by numerical simulations. Two different models, the contact acoustic nonlinearity (CAN) model and the Preisach-Mayergoyz (PM) model, are used to simulate a localized damage in a thin plate. Pulse inversion method is employed to extract the second and fourth harmonics from the received signal. Time reversal is performed to compensate the dispersion of S(0)mode Lamb waves. Consequently, the higher harmonics generated from the damaged area can be refocused on their source. By investigating the spatial distribution of harmonic wave packets, the location of micro-cracks will be revealed. The numerical simulations indicate that this method gives accurate locations of the damaged area in a plate. Furthermore, the PM model is proved to be a suitable model to simulate the micro-cracks in plates for generation of higher harmonics.
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