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(SiO_(2))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SiO_(2)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/SiO_(2)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。
In order to improve the bonding performance of composite-steel interface,epoxy adhesive was modi-fied by surface functionalized nano-montmorillonite(MMT)and silica(SiO_(2)).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/SiO_(2) is 7∶3 and the total addi-tion 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/SiO_(2) has uniform dis-tribution of internal particles and obvious cross-section roughness.This can reduce stress concentration and promote composite-steel interface interaction,thereby improving its bonding performance.
作者
李梦晴
吉新柱
方园
LI Mengqing;JI Xinzhu;FANG Yuan(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《复合材料科学与工程》
北大核心
2025年第7期71-78,98,共9页
Composites Science and Engineering
基金
“十四五”国家重点研发计划(2023YFB3711600)。
作者简介
第一作者: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。;通信作者: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。
