COMPOSITES SCIENCE AND ENGINEERING ›› 2025, Vol. 0 ›› Issue (7): 71-78.DOI: 10.19936/j.cnki.2096-8000.20250728.009

• DESIGN AND TECHNIQUE • Previous Articles     Next Articles

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

LI Mengqing, JI Xinzhu, FANG Yuan*   

  1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
  • Received:2024-06-28 Online:2025-07-28 Published:2025-08-22

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

CLC Number: