期刊
SENSORS
卷 18, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/s18082451
关键词
structural health monitoring; nonlinear Lamb waves; zero-frequency mode
资金
- National Natural Science Foundation of China [11632004, 11602040, 11502036, 11604033]
- Key Program for International Science and Technology Cooperation Projects of Ministry of Science and Technology of China [2016YFE0125900]
- Key Project of Natural Science Foundation of CQ CSTC [cstc2017jcyjBX0063]
The symmetric zero-frequency mode induced by weak material nonlinearity during Lamb wave propagation is explored for the first time. We theoretically confirm that, unlike the second harmonic, phase-velocity matching is not required to generate the zero-frequency mode and its signal is stronger than those of the nonlinear harmonics conventionally used, for example, the second harmonic. Experimental and numerical verifications of this theoretical analysis are conducted for the primary S-0 mode wave propagating in an aluminum plate. The existence of a symmetric zero-frequency mode is of great significance, probably triggering a revolutionary progress in the field of non-destructive evaluation and structural health monitoring of the early-stage material nonlinearity based on the ultrasonic Lamb waves.
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