含分层损伤复合材料弯曲变形与破坏实验研究

玻璃钢/复合材料 ›› 2019, Vol. 0 ›› Issue (6): 30-36.

含分层损伤复合材料弯曲变形与破坏实验研究

秦礽¹, 李小童², 商雅静¹, 周伟^1*

1.河北大学无损检测研究所,保定071002;
2.国家知识产权局专利局专利审查协作河南中心,郑州450000

收稿日期:2018-09-11 出版日期:2019-06-25 发布日期:2019-06-28
通讯作者: 周伟(1980-),男,博士,教授,主要从事复合材料声学及光学无损检测技术方面的研究,zhouweihy@126.com。
作者简介:秦礽(1996-),女,在读硕士研究生,主要从事复合材料无损检测方面的研究。(注:第二作者所作贡献与第一作者相同。)
基金资助:
河北省教育厅重点项目(ZD2016097);河北大学精品实验项目(2017-BZ-JPSY23)

EXPERIMENTAL STUDY ON BENDING DEFORMATION AND FAILURE OF LAMINATED DAMAGE COMPOSITES

QIN Reng¹, LI Xiao-tong², SHANG Ya-jing¹, ZHOU Wei^1*

1.Non-destructive Testing Laboratory, Hebei University, Baoding 071002, China;
2.Patent Examination Cooperation Henan Center of the Patent Office, SIPO, Zhengzhou 450000, China

Received:2018-09-11 Online:2019-06-25 Published:2019-06-28

摘要/Abstract

摘要： 为研究含对称分层复合材料的损伤破坏特性,本文结合声发射(Acoustic Emission,简称“AE”)技术和数字图像相关(Digital Image Correlation,简称“DIC”)方法,对含对称多分层单向玻璃纤维增强复合材料试件在三点弯曲实验下的屈曲破坏行为和变形场信息进行了研究,并利用k-means聚类分析对试件的损伤模式进行了辨识。结果表明:分层的存在将导致材料的承载能力降低且抵抗变形的能力变弱,压缩载荷下的分层损伤比拉伸载荷下的分层损伤更明显,含分层损伤复合材料在加载过程中会产生更多的AE损伤信号;损伤过程的AE信号通过聚类分析,大致可分为低频、中频和高频信号三类,分别对应含对称分层试件的基体开裂与分层扩展、纤维脱粘和纤维断裂三种损伤模式;含分层损伤试件的位移场变化不稳定且应变场分布比空白对照试件更分散。AE技术可以实时监测材料内部损伤信息,DIC方法能够分析试件表面位移场的变化,两种技术的结合对复合材料的结构健康监测有重要价值。

关键词: 复合材料, 对称多分层, 声发射, 数字图像相关, 聚类分析

Abstract: In order to study the damage characteristic of composite with symmetric delamination, the buckling failure behavior and deformation field information of specimen containing symmetric multilayered unidirectional glass fiber reinforced composite specimens under three-point bending test were studied by using acoustic emission (AE) and digital image correlation (DIC) method. Then, the damage pattern of specimens was identified by k-means clustering analysis. The results showed that lamination damage led to the reduction of the bearing capacity of the material and the weakening of the resistance to deformation, and the layered damage under compression load was more obvious than that under tensile load. The layered damage composite material produced more AE damage signals during loading. The AE signals can be divided into three categories: low frequency, medium frequency and high frequency by cluster analysis, which were corresponding to matrix cracking and delamination, fiber debonding and fiber fracture of the symmetrical layered specimens. The displacement field of the specimen with stratified damage was unstable and the distribution of strain field was more dispersed than that of the blank control sample. AE technology can monitor internal damage information in real time, and DIC method can analyze the changes of specimen surface displacement field. Therefore, the combination of the two technologies is of great value for the structural health monitoring of composite materials.

Key words: composites, symmetric multiple delamination, acoustic emission, digital image correlation, cluster analysis

中图分类号:

TB332

秦礽, 李小童, 商雅静, 周伟. 含分层损伤复合材料弯曲变形与破坏实验研究[J]. 玻璃钢/复合材料, 2019, 0(6): 30-36.

QIN Reng, LI Xiao-tong, SHANG Ya-jing, ZHOU Wei. EXPERIMENTAL STUDY ON BENDING DEFORMATION AND FAILURE OF LAMINATED DAMAGE COMPOSITES[J]. Fiber Reinforced Plastics/Composites, 2019, 0(6): 30-36.

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