|Table of Contents|

Microcrack Recognition Mechanism and Algorithm of Plate Structures Based on Nonlinear Lamb Wave(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
113-121
Research Field:
结构工程
Publishing date:

Info

Title:
Microcrack Recognition Mechanism and Algorithm of Plate Structures Based on Nonlinear Lamb Wave
Author(s):
YAN Shi1;  WANG Lu1; 2;  CUI Sai-jie1;  WANG Xue-nan1;  YU Shui-wang1
(1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China; 2. Heze Communications Investment Development Group Co., Ltd, Heze 274000, Shandong, China)
Keywords:
Lamb wave;  plate structure;  second-order harmonic;  microcrack;  nonlinear coefficient;  damage detection algorithm
PACS:
TU973.2
DOI:
10.19815/j.jace.2021.02039
Abstract:
To study the mechanism of second-order harmonic induced by micro-peeling damage of composite plates, a method to identify horizontal microcrack based on ultrasonic Lamb nonlinear coefficient was proposed. The concept of nonlinear coefficient was introduced and deduced through the one-dimensional wave equation of motion. The detection principle of second-order harmonic was studied by using finite element method. The impacts of width and length of composite plate microcrack and amplitude and product of frequency and thickness of excitation signal on the nonlinear coefficient β were simulated and studied. The simulation results were validated through the experiments. The results show that the nonlinear coefficient decreases with the increase of microcrack width. The nonlinear coefficient firstly increases and then decreases with increase of the microcrack length. With increase of the external excitation amplitude, the nonlinear coefficient is basically unchanged. As the product of frequency and thickness increases, the nonlinear coefficient shows the maximum value at the product of frequency and thickness corresponding to the natural frequency of the structure. The relationship between nonlinear stress wave and geometric characteristics of microdamage can be effectively characterized by nonlinear coefficient β. The proposed horizontal microcrack detection method based on ultrasonic Lamb nonlinear coefficient is feasible.

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Last Update: 2022-09-30