Mode II fracture energy in the adhesive bonding of dissimilar substrates: carbon fibre composite to aluminium joints

The end-notched flexure (ENF) test calculates the value of mode II fracture energy in adhesive bonding between the substrates of same nature. Traditional methods of calculating fracture energy in the ENF test are not suitable in cases where the thickness of the adhesive is non-negligible compared wi...

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Bibliographic Details
Published in:Journal of adhesion science and technology 2013-11, Vol.27 (22), p.2480-2494
Main Authors: Alía, Cristina, Arenas, José M., Suárez, Juan C., Ocaña, Rosa, Narbón, Julián J.
Format: Article
Language:English
Subjects:
aluminium-composite joints
Application fields
Applied sciences
Composites
ENF test
Exact sciences and technology
Forms of application and semi-finished materials
fracture energy
Polymer industry, paints, wood
structural adhesives
Technology of polymers
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Summary:The end-notched flexure (ENF) test calculates the value of mode II fracture energy in adhesive bonding between the substrates of same nature. Traditional methods of calculating fracture energy in the ENF test are not suitable in cases where the thickness of the adhesive is non-negligible compared with adherent thicknesses. To address this issue, a specific methodology for calculating mode II fracture energy has been proposed in this paper. To illustrate the applicability of the proposed method, the fracture energy was calculated by the ENF test for adhesive bonds between aluminium and a composite material, which considered two different types of adhesive (epoxy and polyurethane) and various surface treatments. The proposed calculation model provides higher values of fracture energy than those obtained from the simplified models that consider the adhesive thickness to be zero, supporting the conclusion that the calculation of mode II fracture energy for adhesives with non-negligible thickness relative to their adherents should be based on mathematical models, such as the method proposed in this paper, that incorporate the influence of this thickness.
ISSN:0169-4243
1568-5616
DOI:10.1080/01694243.2013.787516