摘要
针对含分层缺陷的玻璃纤维层合板进行室温单调拉伸试验,利用声发射技术对试样损伤演化进行动态监测。采用K均值聚类分析方法对小波降噪后的声发射信号的幅值、峰值频率等特征参数进行损伤模式识别,根据单调拉伸试验过程中声发射信号能量积累和计数积累的趋势特征,分析不同尺寸和位置的分层缺陷试件的损伤演化机理。结果表明,含分层缺陷的玻璃纤维层合板在拉伸载荷作用下主要存在4类损伤模式:基体开裂、纤维/基体剥离、纤维断裂和纤维束断裂。通过对声发射信号参数进行聚类分析得到各损伤模式的特征频率。此外,实验结果表明不同尺寸和位置的分层缺陷会不同程度降低玻璃纤维复合材料的力学性能。这项研究探索含分层缺陷的复合材料损伤演化机理,为实现风电机组关键部件的健康监测和损伤分析提供依据。
For the glass fiber laminates with layering defects,the room temperature monotonic tensile test was carried out,and the damage evolution of the samples was dynamically monitored by acoustic emission technology.The K-means clustering analysis method was used to identify the damage patterns of the amplitude and peak frequency of the acoustic emission signal after wavelet denoising.According to the trend of the energy accumulation and counting accumulation of acoustic emission signal during the monotonic tensile test,the damage evolution mechanism of layered defect specimens with different sizes and locations was analyzed.The results show that there are four types of damage modes of glass fiber laminates with delamination defects under tensile load:matrix cracking,interfacial debonding,interfacial slip,fiber breakage and fiber bundle breakage.The characteristic frequency of each damage mode is obtained by clustering the acoustic emission signal parameters.In addition,the experimental results show that the layered defects of different sizes and positions will reduce the mechanical properties of the glass fiber composites to varying degrees.This study explores the damage evolution mechanism of composites with delamination defects and,provides a basis for health monitoring and damage analysis of key components of wind turbines.
作者
张亚楠
周勃
俞方艾
陈长征
Zhang Ya’nan;Zhou Bo;Yu Fang’ai;Chen Changzheng(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第4期396-402,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51575361
51675350)
辽宁省百千万人才工程(2015049)
辽宁省高校创新人才项目(2017737)。
关键词
复合材料
声发射
聚类分析
风力机叶片
损伤机理
composite material
acoustic emission
cluster analysis
wind turbine blade
damage mechanism
