Mode-I and II fracture behavior of metal-to-composite bonded interfaces with a graphene nanoplatelet-reinforced structural epoxy adhesive

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Sistani, AJ (Author) Other; Shariati, M (Author) Other; Zamani, P (Author) Other; da Silva, LFM (Author) FEUP

Journal

Title: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications

Vol. 238

Pages: 1538-1556

ISSN: 1464-4207

Publisher: SAGE

Indexing

ISI Web of Knowledge - 0 Citations

Other information

Authenticus ID: P-00Z-YCY

DOI: 10.1177/14644207241226609

Abstract (EN): Epoxy adhesive joints are increasingly being used to bond structural components in automotive, marine, and aircraft bodies. However, poor fracture toughness energy and low resistance to crack growth in structural epoxy adhesives are important drawbacks of these adhesives. To overcome this challenge, this paper aims to investigate the influence of dispersing graphene nanoplatelets (GNPs) into Axson-Sika Adekit A 140-1 structural epoxy adhesive on the fracture behavior of aluminum-to-glass fiber-reinforced polymer composite joints under mode-I and mode-II fracture tests. Double cantilever beam (DCB) and end-notched flexure specimens were fabricated to perform mode-I and mode-II fracture tests. For each specimen, three specimen groups including neat and graphene nanoplatelet reinforced with 0.05 wt.%, 0.1 wt.%, and 0.2 wt.% were considered. Results revealed that, for both of mode-I and mode-II tests, the optimum fracture toughness energy was obtained by inserting 0.1 wt.% of nanoparticles. By addition of 0.05 wt.% and 0.1 wt.% of GNPs, mode-I fracture toughness energy was improved by 90% and 115% compared with neat DCB specimens, while mode-II energy release rate increased by 55% and 83%, respectively. Finally, debonded surfaces were examined using optical microscope and scanning electron microscopy in order to find failure patterns and microstructural reinforcing mechanisms.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 19