Journal
MATERIALS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/ma11112096
Keywords
ultrasonic nonlinearity; lamb waves; S-0 mode; numerical simulation; experiment
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Funding
- National Science Foundation of China [11632004, 11604033, 11602040]
- 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]
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This paper investigates the propagation of low-frequency S-0 mode Lamb waves in plates with quadratic nonlinearity through numerical simulations and experimental measurements. Both numerical and experimental results manifest distinct ultrasonic nonlinear behavior which is mainly presented by the second harmonics. Meanwhile, we find that both the acoustic nonlinearity parameter and dispersion distance show the exponential decay trend with the increase of frequency-thickness. Moreover, the results reveal that the frequency is key to affect the acoustic nonlinearity parameter and dispersion distance with the same frequency-thickness. This study theoretically and experimentally reveals that nonlinear Lamb waves of the low-frequency S-0 mode are feasible to quantitatively identify material weak nonlinearity in plates.
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