The end-notched flexure (ENF) test calculates the value of mode II fracture energy in adhesiveudbonding between the substrates of same nature. Traditional methods of calculatingudfracture energy in the ENF test are not suitable in cases where the thickness of the adhesiveudis non-negligible compared with adherent thicknesses. To address this issue, a specificudmethodology for calculating mode II fracture energy has been proposed in this paper. Toudillustrate the applicability of the proposed method, the fracture energy was calculated byudthe ENF test for adhesive bonds between aluminium and a composite material, which consideredudtwo different types of adhesive (epoxy and polyurethane) and various surface treatments.udThe proposed calculation model provides higher values of fracture energy thanudthose obtained from the simplified models that consider the adhesive thickness to be zero,udsupporting the conclusion that the calculation of mode II fracture energy for adhesives withudnon-negligible thickness relative to their adherents should be based on mathematical models,udsuch as the method proposed in this paper, that incorporate the influence of this thickness.
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