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

卷:

39卷

期数:

2022年05期

页码:

113-121

栏目:

结构工程

出版日期:

2022-09-30

文章信息/Info

Title:

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

文章编号:

1673-2049(2022)05-0113-09

作者:

阎 石¹,王 鲁^1,2,崔赛杰¹,王雪南¹,于水旺¹

(1. 沈阳建筑大学 土木工程学院,辽宁 沈阳 110168; 2. 菏泽交通投资发展集团有限公司,山东 菏泽 274000)

Author(s):

YAN Shi¹, WANG Lu^1,2, 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)

关键词:

Lamb波;  板状结构;  二次谐波;  微裂缝;  非线性系数;  损伤识别算法

Keywords:

Lamb wave;  plate structure;  second-order harmonic;  microcrack;  nonlinear coefficient;  damage detection algorithm

分类号:

TU973.2

DOI:

10.19815/j.jace.2021.02039

文献标志码:

A

摘要:

为了研究复合板微小剥离损伤诱发二次谐波机理,提出一种基于超声Lamb波非线性系数的水平向微裂缝识别方法。通过薄板结构的一维波动方程,推导并阐述了非线性系数的概念; 采用有限元数值分析法,研究了基于二次谐波的损伤识别原理,并对复合板微裂缝的宽度、长度和激励信号的幅值、频厚积等参数对超声Lamb波非线性系数β的影响进行模拟分析,通过试验验证了模拟结果的正确性。结果表明:随着微裂纹宽度增加,非线性系数呈非线性减小; 随着微裂纹长度增加,非线性系数值先增加后减小; 随着外部激励幅值的增加,非线性系数值基本不变; 随着频厚积的增加,非线性系数值在结构自振频率对应的频厚积处呈现最大值; 利用非线性系数β能够有效表征非线性应力波与微损伤几何特征之间的关系; 基于超声Lamb波非线性系数的水平向微裂缝识别方法是可行的。

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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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-02-08
基金项目:国家重点研发计划项目(2017YFC1503106)
作者简介:阎 石(1962-),男,辽宁沈阳人,教授,博士研究生导师,工学博士,E-mail:cesyan@sjzu.edu.cn。

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更新日期/Last Update: 2022-09-30