含分层缺陷的叶片复合材料层合板损伤识别方法的研究  

A STUDY ON FATIGUE DAMAGE IDENTIFICATION METHOD OF A BLADE COMPOSITE LAMINATE WITH DELAMINATION DEFECTS

作　　者：俞方艾 周勃 张雪岩[2] 辛雯 YU FangAi;ZHOU Bo;ZHANG XueYan;XIN Wen(School of Architecture&Civil Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Mechanical Engineering,Liaoning Institute of Science and Technology,Benxi 117004,China)

机构地区：[1]沈阳工业大学建筑与土木工程学院,沈阳110870 [2]沈阳工业大学机械工程学院,沈阳110870 [3]辽宁科技学院机械工程学院,本溪117004

出　　处：《机械强度》2022年第6期1327-1334,共8页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(52175105);沈阳市中青年科技创新人才计划(RC190365);航空动力装备振动及控制教育部重点实验室开放课题(VCAME201905)资助。

摘　　要：声发射技术可以实时监测复合材料的损伤状态,而损伤状态识别的准确性依赖于声发射信号的处理和提取。提出了一种基于谐波小波功率谱和能量谱分析的声发射信号处理方法,以实现含分层缺陷的叶片复合材料损伤状态的识别。首先,对有无分层缺陷的叶片复合材料层合板试件进行单轴拉伸试验,记录损伤过程中的声发射信号参数。然后,依据谐波小波包分解法比较分析声发射信号的功率谱与能量谱特征,识别出含分层缺陷的叶片复合材料不同损伤模式对应的频率范围。与传统小波分析相比,谐波小波分析法能够准确有效地检测出含分层缺陷叶片复合材料的不同损伤特征和损伤模式,这对于实际工程中在役叶片的运行状态检测有一定的借鉴意义。Acoustic emission technique can monitor the fatigue damage state of composite materials in real time.The identification accuracy of damage state depends on the processing and extraction of acoustic emission signals.A method of the acoustic emission signal processing based on harmonic wavelet power spectrum and energy spectrum is proposed.The damage state of composite materials with delamination defects can be identified.First,the uniaxial tensile experiment was carried out on the composite laminates with or without delamination defects.The acoustic emission signals during the process of damage evolution were recorded.Then,the frequency distribution range of different damage modes based on the harmonic wavelet packet decomposition was obtained according to the damage characteristics analyzed by frequency spectrum and energy spectrum.Compared with the traditional wavelet analysis,the harmonic wavelet analysis can detect the different damage characteristics and damage modes of composite blade with delamination defects accurately.It can be used to detect the operated state for in⁃service blades in practical engineering.

关 键 词：风力机叶片 声发射信号 复合材料 谐波小波 损伤 

分 类 号：TH145􀆰[一般工业技术—材料科学与工程]