Results 211 to 220 of about 2,905,814 (268)

Internal Antisymmetric Lamb Waves

Акустический журнал, 2023
A class of antisymmetric solutions of Lamb wave equations with zero strains and stresses on the surface, so-called internal Lamb waves, is studied. Two types of such solutions are found: the first corresponds to the Lamé phase velocity; the second, to phase velocities exceeding the velocity of the expansion wave in an unbounded medium.
openaire   +1 more source

Time-frequency damage index of Broadband Lamb wave for corrosion inspection

, 2020
The method based on Lamb wave shows great potential for structural health monitoring (SHM) and nondestructive testing (NDT). Damage index (DI) is a series of features extracted from Lamb wave signal that can be linked with damage, which can serve as an ...
J. Hua, Xuwei Cao, Yinggang Yi, Jing Lin
semanticscholar   +1 more source

LAMB WAVES IN A POROELASTIC PLATE

Journal of Computational Acoustics, 2013
In this paper we consider the propagation of Lamb waves in a poroelastic plate containing a linear crack, the special case where the surface of the plate is unloaded, by employing the Wiener-Hopf technique. The problem we solve here is a mathematically interesting toy problem. Physically speaking the more reasonable problem would be to consider there
Gilbert, Robert P., Lee, Doo-Sung, Ou, M. Yvonne   +2 more
openaire   +1 more source

Impact damage assessment in orthotropic CFRP laminates using nonlinear Lamb wave: Experimental and numerical investigations

, 2020
In this study, experimental and numerical approaches based on the nonlinear ultrasonic Lamb wave are used to detect the barely visible impact damages (BVID) in orthotropic CFRP laminates due to low velocity impact (LVI).
Y. Tie, Zhang Qingsong, Yuliang Hou, Cheng Li   +3 more
semanticscholar   +1 more source

Dispersion curve analysis method for Lamb wave mode separation

Structural Health Monitoring, 2020
The Lamb wave inspection has emerged as a promising method for structural health monitoring and nondestructive testing. However, because of the highly dispersive and multimodal features, the Lamb wave mode separation has become a challenging problem ...
Yue Hu, Yanping Zhu, Xiaotong Tu, Jingchao Lu, Fucai Li   +4 more
semanticscholar   +1 more source

Deep learning based crack damage detection technique for thin plate structures using guided lamb wave signals

Smart materials and structures (Print), 2019
In this paper, convolutional neural network (CNN) is employed for crack damage detection in thin aluminum plates. Identifying a successful damage feature is a critical step in computationally efficient damage detection and characterization process ...
Heng Liu, Yunfeng Zhang
semanticscholar   +1 more source

Long-Wave Asymptotics of Lamb Waves

Mechanics of Solids, 2017
The six-dimensional complex formalism is used to obtain equations for determining long-wave asymptotics of symmetric fundamental modes of Lamb waves in an anisotropic layer. Analytic expressions are obtained for long-wave asymptotics of phase velocities of Lamb waves propagating in an isotropic layer.
R. V. Goldstein, S. V. Kuznetsov
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Efficient Lamb-wave based damage imaging using multiple sparse Bayesian learning in composite laminates

, 2020
Lamb wave techniques have been widely used for structural health monitoring (SHM) and nondestructive testing (NDT). To deal with dispersive and multimodal problems of Lamb wave signals, many signal processing methods have been developed.
Han Zhang, J. Hua, Fei Gao, Jing Lin
semanticscholar   +1 more source

Soliton-like lamb waves

Journal of Applied Mathematics and Mechanics, 2009
The author presents results of an analysis of the velocity and the polarization of acoustic Lamb waves propagating in the directions of elastic symmetry of one- and two-layer anisotropic media at small vanishing frequencies (soliton-like waves). The method of fundamental matrices is used for the construction of a solution.
openaire   +2 more sources

Identification of matrix cracking in cross-ply laminated composites using Lamb wave propagation

, 2020
The purpose of the present study is to develop a nondestructive evaluation method and propose a model-independent viscoelastic characterization approach for the identification and classification of the matrix cracking in polymeric composites using the ...
A. Mardanshahi, M. Shokrieh, S. Kazemirad   +2 more
semanticscholar   +1 more source