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Experimental identification of static and dynamic strength of epoxy based adhesives in high thickness joints

Garbiñe Fernandez, Dirk Vandepitte, Hodei Usabiaga, Brecht Van Hooreweder, Stijn Debruyne

Journal of Solids and Structures, Volume 120, 1 August 2017, Pages 292-303


Epoxy based adhesives already have a long history in structural joining. Commonly with this type of adhesive, the bond layer is thin. However, as the thickness of a joint increases (e.g. over 10 mm), its structural properties may alter very much. In such a case, both the interfacial strength and the intrinsic adhesive strength need to be verified in static and dynamic conditions. This research work identifies joint strength using a mainly experimental procedure. Coupons are subjected both to quasi-static and fatigue loads at different conditions. In order to take into account the variability present in the experimental campaign, a probabilistic approach identifies the most appropriate failure criterion. The strength prediction method considers a statistical size effect in the strength of the material by considering not only the magnitude of the stress distributions, but also the volume over which these act. Both quasi-static and fatigue results are analysed using probabilistic tools, leading to quite fine results.


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