Shear induced toughening in bonded joints: experiments and analysis

J.G. Swadener, K.M. Liechti, Y.-M. Liang

Research output: Contribution to journalArticlepeer-review


Bonded joint specimens were fabricated from composite adherends and either an epoxy or a urethane adhesive. In mixed-mode fracture experiments, the epoxy bonded specimens generally failed by subinterfacial fracture in the composite, while specimens bonded with urethane failed very close to the adhesive/substrate interface. For the epoxy bonded specimens, fracture toughness did not change significantly with mode-mix, but for urethane bonded joints, fracture toughness increased with increasing shear load. Finite element analysis, which modeled specimens bonded with the two adhesives, showed similar trends. The different toughening behaviors for the two bonded joints can be attributed to dissipation of energy through inelastic deformation, which was insignificant in the epoxy-bonded joints but substantial when the urethane was used as the bonding agent.
Original languageEnglish
Pages (from-to)113-132
Number of pages20
JournalInternational Journal of Fracture
Issue number2
Publication statusPublished - 1 Mar 2002


  • fracture
  • adhesively bonded joints
  • cohesive zone model
  • geometric moiré
  • finite element analysis
  • mixed-mode fracture toughness


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