R-curve behavior of adhesively bonded composite joints with highly toughened epoxy adhesive under mixed mode conditions

Yousuke Kouno, Makoto Imanaka, Ryutaro Hino, Masaki Omiya, Fusahito Yoshida

Research output: Contribution to journalArticlepeer-review

Abstract

The fracture toughness of an adhesively bonded carbon fiber reinforced plastic joint under mixed mode (I and II) conditions was determined by means of the Fernlund–Spelt type double cantilever beam (DCB) test, where a rubber-modified epoxy adhesive was used. The R curves were determined by calculating the energy release rates, GI and GII, based on the beam theory, along with a finite element analysis. The total energy release rate GT (= GI + GII) strongly depended on the I–II mixed mode. This means that it remarkably increased with increasing mode-II component; furthermore, it varied with crack growth from GTC (at the onset of cracking) to GTS (at the steady crack-propagation region). The difference between GTC and GTS increased with the increase in the mode II component. Such R-curve characteristics were discussed based on observation of the fracture surfaces with a scanning electron microscope and the corresponding crack propagation-path behavior.

Original languageEnglish
Article number102762
JournalInternational Journal of Adhesion and Adhesives
Volume105
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • Adhesively bonded CFRP joint
  • Mixed-mode fracture
  • R-curve
  • Toughened epoxy adhesive

ASJC Scopus subject areas

  • Biomaterials
  • Chemical Engineering(all)
  • Polymers and Plastics

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