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Interaction of Lamb Wave Modes with Weak Material Nonlinearity: Generation of Symmetric Zero-Frequency Mode.

Authors :
Sun, Xiaoqiang
Ding, Xiangyan
Li, Feilong
Zhou, Shijie
Liu, Yaolu
Hu, Ning
Su, Zhongqing
Zhao, Youxuan
Zhang, Jun
Deng, Mingxi
Source :
Sensors (14248220). Aug2018, Vol. 18 Issue 8, p2451. 1p.
Publication Year :
2018

Abstract

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 S0 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14248220
Volume :
18
Issue :
8
Database :
Academic Search Index
Journal :
Sensors (14248220)
Publication Type :
Academic Journal
Accession number :
131400499
Full Text :
https://doi.org/10.3390/s18082451