纳米黏结剂修补复合材料的胶接界面损伤演化行为研究

doi:10.19936/j.cnki.2096-8000.20220428.012

复合材料科学与工程 ›› 2022, Vol. 0 ›› Issue (4): 73-80.DOI: 10.19936/j.cnki.2096-8000.20220428.012

纳米黏结剂修补复合材料的胶接界面损伤演化行为研究

姬晓龙^1,2,3, 周伟^1,2,3*, 杜永刚^1,2,3, 刘佳^1,2,3, 马连华^1,2,3

1.河北大学质量技术监督学院,保定071002;
2.计量仪器与系统国家地方联合工程研究中心,保定071002;
3.河北省能源计量与安全检测技术重点实验室(筹),保定071002

收稿日期:2001-06-01 出版日期:2022-04-28 发布日期:2022-06-02
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:姬晓龙(1996-),男,硕士研究生,主要从事胶接修补结构无损检测方面的研究。
基金资助:
河北大学研究生创新基金项目(HBU2021ss080)

The investigation of damage evolution behaviour on adhesive interface of composites using nano-adhesive

JI Xiao-long^1,2,3, ZHOU Wei^1,2,3*, DU Yong-gang^1,2,3, LIU Jia^1,2,3, MA Lian-hua^1,2,3

1. College of Quality and Technical Supervision, Hebei University, Baoding 071002, China;
2. National & Local Joint Engineering Research Center of Metrology Instrument and System, Hebei University, Baoding 071002, China;
3. Hebei Key Laboratory of Energy Metering and Safety Testing Technology, Hebei University, Baoding 071002, China

Received:2001-06-01 Online:2022-04-28 Published:2022-06-02

摘要/Abstract

摘要： 本文在环氧树脂中添加0.1wt%的纳米纤维素以制备纳米黏结剂,旨在改善环氧树脂黏结剂的机械强度以及柔韧性,从而提高其修补效率和耐久性。将声发射技术和数字图像相关技术结合,研究弯曲载荷下复合材料内部的力学行为和变形损伤。通过声发射特征信号的分析、聚类处理与全场/局部应变和位移的测量,对不同修补结构的失效机理进行深入讨论。结果表明:与环氧树脂黏结剂相比,纳米黏结剂具有更好的黏结效果,展现出较高的能量吸收和载荷转移能力,修补试件的失效载荷和最大位移分别提高了3.1%和6.1%。聚类分析结果和内部损伤的声发射响应可以用来评估修复性能并获得主要损伤模式,不同修补试件胶接界面上的变形场有助于监测胶层内损伤的起始和扩展。将声发射特征响应与内部变形损伤建立联系,成功实现了胶接修补界面的损伤行为演化。

关键词: 互补的无损检测技术, 纳米纤维素, 修补效率, 胶接界面损伤演化, 复合材料

Abstract: Adhesive plays an important role on the repair efficiency and durability in the field of composites patch repair. Thus, it is important to carry out the optimization studies of adhesive. In this study, aiming to improve the mechanical strength and flexibility of epoxy resin adhesive, 0.1wt% cellulose nanofibers were added into epoxy resin to make nano-adhesive, so as to increase its repair efficiency and durability. Mechanical behaviors and deformation damages of different repair configurations under three-point bending loads were investigated by a combination of acoustic emission and digital image correlation technologies. Failure mechanisms were deeply discussed through the analysis of characteristic signals, cluster results as well as the measurement of global and local strain/displacement fields. According to the cluster analysis results and acoustic emission response of interior damage, the repair performance could be assessed and the main damage modes could be obtained. The deformation fields on the adhesive interface of different repaired specimens obtained from digital image correlation method could help to monitor the damage initiation and extension within adhesive layer. The experiment results showed that nano-adhesive had better bonding effect and showed higher energy absorption and load transfer capacity. The failure load and maximum displacement of repaired specimens were increased by 3.1% and 6.1%, respectively, compared with epoxy resin adhesive. The amplitude, frequency, relative energy and cumulative hits of acoustic emission signals of different repaired composites could successfully reflect the damage changes from micro-scale to macro-scale. The real-time displacement fields and strain fields obtained from digital image correlation technology provided the information of damage accumulation on the adhesive interface. The experimental results of mechanics were in agreement with the analysis results of acoustic emission and digital image correlation technologies. The damage evolution behaviors on the adhesive interface were realized through establishing the correspondence of acoustic emission characteristic response and internal deformation damage.

Key words: complementary non-destructive testing technologies, cellulose nanofibers, repair efficiency, damage evolution of adhesive interface, composites

中图分类号:

TB332

姬晓龙, 周伟, 杜永刚, 刘佳, 马连华. 纳米黏结剂修补复合材料的胶接界面损伤演化行为研究[J]. 复合材料科学与工程, 2022, 0(4): 73-80.

JI Xiao-long, ZHOU Wei, DU Yong-gang, LIU Jia, MA Lian-hua. The investigation of damage evolution behaviour on adhesive interface of composites using nano-adhesive[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(4): 73-80.

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纳米黏结剂修补复合材料的胶接界面损伤演化行为研究

The investigation of damage evolution behaviour on adhesive interface of composites using nano-adhesive

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