On adhesive properties of nano-silica/epoxy bonded single-lap joints

Helezi Zhou, Hong Yuan Liu, Huamin Zhou, Yun Zhang, Xiping Gao, Yiu Wing Mai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

107 Citations (Scopus)

Abstract

The effects of nano-silica on the adhesive properties of epoxy were systematically studied by single lap-shear tests under quasi-static and cyclic loadings. The adhesives were produced from different amount of nano-silica particles incorporated into diglycidyl ether of bisphenol A (DGEBA) epoxy. Stainless steel plates were chosen as adherends. Quasi-static tests were conducted on single lap-shear joints at ambient, with and without exposure to 100% RH at 60 °C for different times. Cyclic fatigue tests were also performed on these bonded joints under tension-tension loading. The fracture surface morphology was examined using scanning electron microscopy (SEM) to identify the failure mechanisms. Compared to neat epoxy, it was found that the adhesive strength is increased by 20% under quasi-static loadings. Even after hygrothermal treatment, the benefit of having nano-silica in neat epoxy on the adhesive joint strength was retained. In cyclic fatigue, without hygrothermal aging, nano-slica/epoxy adhesives have longer lifetimes than neat epoxy; but after hygrothermal treatment, they have similar lifetimes for given stress amplitudes.

Original languageEnglish
Pages (from-to)212-218
Number of pages7
JournalMaterials and Design
Volume95
DOIs
Publication statusPublished - 5 Apr 2016
Externally publishedYes

Keywords

  • Adhesive property
  • Epoxy resin
  • Fatigue
  • Hygrothermal
  • Lap-shear
  • Nano-silica

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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