蒙脱土/二氧化硅改性环氧胶对复合材料-钢界面黏结性能的影响

doi:10.19936/j.cnki.2096-8000.20250728.009

复合材料科学与工程 ›› 2025, Vol. 0 ›› Issue (7): 71-78.DOI: 10.19936/j.cnki.2096-8000.20250728.009

蒙脱土/二氧化硅改性环氧胶对复合材料-钢界面黏结性能的影响

李梦晴, 吉新柱, 方园^*

南京工业大学土木工程学院,南京 211816

收稿日期:2024-06-28 出版日期:2025-07-28 发布日期:2025-08-22
通讯作者: 方园(1983—),女,博士,副研究员,主要从事复合材料结构方面的研究,yuanfang@njtech.edu.cn。
作者简介:李梦晴(2000—),女,硕士研究生,主要从事复合材料结构方面的研究。
基金资助:
“十四五”国家重点研发计划(2023YFB3711600)

Effect of montmorillonite/silica modified epoxy adhesive on the bonding properties of composite-steel interface

LI Mengqing, JI Xinzhu, FANG Yuan^*

College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China

Received:2024-06-28 Online:2025-07-28 Published:2025-08-22

摘要/Abstract

摘要： 为了提升复合材料-钢界面黏结性能,采用表面功能化纳米蒙脱土(MMT)和二氧化硅(SiO₂)对环氧胶进行改性,研究纳米粒子含量、胶层厚度、搭接长度等参数对复合材料-钢双搭接接头界面黏结性能的影响。试验结果表明:当纳米MMT和SiO₂质量比为7∶3、总添加含量为1%时,试件的拉伸强度、剪切强度达到最高,分别为46.13 MPa、12.79 MPa,相比于纯环氧胶试件,提升了53.2%和44.85%。胶层厚度的增加能够提高试件承载力和最大应变值;搭接长度的增加对于改善应变的分布梯度和提升最大剪应力、极限滑移量有明显效果,由于有效黏结长度的存在,搭接长度对试件承载力的增加呈现先快后慢的趋势。相比于纯环氧胶,采用表面功能化纳米MMT/SiO₂改性的环氧胶内部粒子分布均匀,断面粗糙度明显,能够减少应力集中,促进复合材料-钢界面相互作用,从而提升其黏结性能。

关键词: 复合材料-钢界面, 纳米改性环氧胶, 双搭接接头, 黏结性能

Abstract: In order to improve the bonding performance of composite-steel interface, epoxy adhesive was modified by surface functionalized nano-montmorillonite (MMT) and silica (SiO₂). The effects of nano-particle content, adhesive layer thickness and lap length on the interfacial bonding performance of composite-steel double lap joint were studied. The test results show that when the mass ratio of nano-MMT/SiO₂ is 7∶3 and the total addition content is 1%, the tensile strength (46.13 MPa) and shear strength (12.79 MPa) of the specimens reach the highest, which are 53.2% and 44.85% higher than those of the pure epoxy adhesive specimens. The increase of the thickness of the adhesive layer can improve the bearing capacity and the maximum strain value of the specimen. The increase of lap length has obvious effect on improving the distribution gradient of strain and increasing the maximum shear stress and ultimate slip. As the overlap length increases, the bearing capacity of the specimen first increases rapidly and then slowly increases, which can be attributed to the existence of an effective bond length. Compared with pure epoxy adhesive, the epoxy adhesive modified by surface functionalized nano-MMT/SiO₂ has uniform distribution of internal particles and obvious cross-section roughness. This can reduce stress concentration and promote composite-steel interface interaction, thereby improving its bonding performance.

Key words: composite-steel interface, nano modified epoxy adhesive, double lap joint, bond behavior

中图分类号:

TB332

李梦晴, 吉新柱, 方园. 蒙脱土/二氧化硅改性环氧胶对复合材料-钢界面黏结性能的影响[J]. 复合材料科学与工程, 2025, 0(7): 71-78.

LI Mengqing, JI Xinzhu, FANG Yuan. Effect of montmorillonite/silica modified epoxy adhesive on the bonding properties of composite-steel interface[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(7): 71-78.

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蒙脱土/二氧化硅改性环氧胶对复合材料-钢界面黏结性能的影响

Effect of montmorillonite/silica modified epoxy adhesive on the bonding properties of composite-steel interface

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