The nonlinear S0 Lamb mode in a plate with a linearly-varying thickness

被引：20
|
作者：
Hu, Zhongtao [1 ,2 ]
An, Zhiwu [1 ,2 ]
Kong, Yuanyuan [1 ,2 ]
Lian, Guoxuan [1 ]
Wang, Xiaomin [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Acoust, State Key Lab Acoust, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
ULTRASONICS | 2019年 / 94卷
关键词：
Nonlinear Lamb wave; S-0; mode; Varying thickness plates; CUMULATIVE 2ND-HARMONIC GENERATION; GUIDED-WAVES; 2ND HARMONICS; PROPAGATION; REFLECTION;
D O I：
10.1016/j.ultras.2018.11.013
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
The aim of this paper is to investigate propagation characteristics and the generation mechanism of the nonlinear lowest-order symmetric Lamb mode (S-0) which propagates downslope in free elastic plates with slowly linearly varying-thickness. From theoretical analyses, in a low frequency-thickness product (fd) range, the S-0 mode is slightly dispersive, it is easy to generate, and it approximately satisfies the principle of the phase velocity matching. Therefore, if a S-0 mode is excited at a proper frequency in the low fd range, the amplitude of the second harmonic wave is linearly increasing in a certain propagating-distance, which is valuable for the practical NDE application of the second harmonic wave. Moreover, numerical simulations and experiments have been carried out to validate theoretical results. Our investigation of properties of the second harmonic wave can be applied to characterize and evaluate micro-structural damages in varying-thickness waveguides.
引用
收藏
页码：102 / 108
页数：7
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