基于Lamb波的复合材料结构分层损伤扩展监测研究

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (7): 20-26.

基于Lamb波的复合材料结构分层损伤扩展监测研究

王梓尧, 严刚^*

南京航空航天大学航空学院机械结构力学及控制国家重点实验室,南京210016

收稿日期:2019-12-03 出版日期:2020-07-28 发布日期:2020-07-28
通讯作者: 严刚(1981-),男,博士,副教授,主要从事复合材料结构健康监测方面的研究,yangang@nuaa.edu.cn。
作者简介:王梓尧(1995-),男,硕士研究生,主要从事复合材料结构健康监测方面的研究。
基金资助:
国家自然科学基金项目(11602104);江苏高校优势学科建设工程资助项目

MONITORING OF DELAMINATION GROWTH FOR COMPOSITE STRUCTURE BY USING LAMB WAVES

WANG Zi-yao, YAN Gang^*

State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2019-12-03 Online:2020-07-28 Published:2020-07-28

摘要/Abstract

摘要： 分层损伤会严重削弱复合材料结构的强度和稳定性,对其进行监测和识别对保证结构安全具有重要意义。本文提出一种基于Lamb波和时频分析的方法,对复合材料结构中的分层损伤扩展进行在线连续监测。首先研究了Lamb波在含分层复合材料层合板中的传播特性,建立了Lamb波传播时间与分层长度之间的关系,为分层损伤扩展监测提供理论基础;然后采用小波变换对由压电传感元件激励和接收的Lamb波信号在时频域进行分析,测量出Lamb波在压电传感元件之间的传播时间用于确定分层长度等扩展情况。数值仿真和试验研究结果表明,随着分层长度的增加,Lamb波的传播时间逐渐延长,并与分层长度呈线性关系,可以通过小波变换提取的传播时间信息监测出分层的扩展,验证了所提出方法的可行性。

关键词: 复合材料结构, 分层扩展监测, Lamb波, 时频分析

Abstract: Delamination damage can severely weaken the strength and stability of composite structures, so it is very important to monitor and identify it to ensure the structural safety. This paper proposes an approach to continuously monitor delamination growth in composite structures by using Lamb waves and time-frequency analysis. First, the propagation characteristic of Lamb waves in composite laminate containing delamination damage is studied, and the relationship between time of flights (TOFs) and the length of delamination is established to provide theoretical basis for delamination growth monitoring. Then the wavelet transform is applied to analyze the Lamb waves signal acquired by piezoelectric sensor in time and frequency domain to measure the TOFs between two sensors to determine the length of delamination. Numerical simulation and experimental results have demonstrated that the TOFs of Lamb waves between two sensors increase with the increase of the delamination length which is basically linear. And, through the TOFs extracted by wavelet transform, the delamination growth can be monitored, verifying the effectiveness of the proposed approach.

Key words: composite structures, monitoring of delamination growth, Lamb waves, time-frequency analysis

中图分类号:

TB332

王梓尧, 严刚. 基于Lamb波的复合材料结构分层损伤扩展监测研究[J]. 复合材料科学与工程, 2020, 0(7): 20-26.

WANG Zi-yao, YAN Gang. MONITORING OF DELAMINATION GROWTH FOR COMPOSITE STRUCTURE BY USING LAMB WAVES[J]. Composites Science and Engineering, 2020, 0(7): 20-26.

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