基于声发射信号的三维针刺C/SiC复合材料拉伸损伤演化研究  

Evaluating Damage Evolution of Three-dimension Needled C/SiC Composite Based on Acoustic Emission Signal Analysis

作　　者：黄喜鹏 王波[2] 杨成鹏[1] 潘文革[1] 刘小瀛[3] HUANG Xi-Peng;WANG Bo;YANG Cheng-Peng;PAN Wen-Ge;LIU Xiao-Ying(School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi＇an 710129, China;School of Aeronautics, Northwestern Polytechnical University, Xi＇an 710072, China;Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnieal University, Xi＇an 710072, China)

机构地区：[1]西北工业大学力学与土木建筑学院,西安710129 [2]西北工业大学航空学院,西安710072 [3]西北工业大学超高温结构复合材料重点实验室,西安710072

出　　处：《无机材料学报》2018年第6期609-616,共8页Journal of Inorganic Materials

基　　金：超高温结构复合材料重点实验室创新基金(6142911050116);国家自然科学基金(51275422)~~

摘　　要：本研究对三维针刺C/SiC(3-dimension needled C/SiC,3D-NC/SiC)复合材料进行室温单调拉伸和拉伸加载-卸载试验,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进行了损伤模式识别,结合试样断口扫描电镜观测,发现3D-NC/SiC复合材料在拉伸载荷作用下主要存在五类损伤模式:基体开裂、界面脱粘、界面滑移、纤维断裂和纤维束断裂。通过快速傅里叶变换(FFT)方法对小波降噪后的信号进行频谱分析得出:3D-NC/SiC复合材料在拉伸载荷作用下主要存在240、370和455 k Hz三种频率的损伤信号,分别对应于界面损伤、基体损伤和纤维损伤。结合单调拉伸试验过程声发射信号能量柱分布和加卸载过程累积能量曲线特征,分析了试样损伤演化机理。Static tensile test of three dimension needled C/SiC composite material （3D-N C/SiC） was carried out at room temperature and damage processes of the composite was monitored online by an acoustic emission （AE） instrument. Noise information in the AE signals was removed according to Wavelet theory, and K-means clustering was used to analyze the AE signals. Combined with SEM observation, five damage modes were found during the tension： matrix cracking, interfacial debonding, interfacial sliding, individual fiber breakage, and fiber bundle rupture. The damage signal of 3D-N C/SiC composite contained three main frequencies at 240, 370 and 455 kHz, corresponding to interface damage, matrix damage and fiber fracture, respectively. Damage evolutionary mechanism was proposed through AE events and cumulative energy variation with loading time.

关 键 词：C/SIC复合材料 声发射 聚类分析 损伤机理 

分 类 号：TB332[一般工业技术—材料科学与工程]