Abstract
Adhesive bonding is mostly used in aerospace, aeronautical and automotive industries due to its advantages over traditional fastening methods, such as decreased weight, ease of production and less geometric discontinuities. Due to the high responsibility that bonded structures present in the aforementioned industries, a necessity to accurately predict the fracture behaviour under various and simultaneous loads was created. For strength prediction purposes, numerical simulations, recurring to Cohesive Zone Models (CZM), can be performed. In this work, a numerical analysis is carried out to verify the effect of the adhesive thickness (tA) variation on tensile fracture toughness (Gnc) of a bonded joint. The cohesive properties and geometric dimensions introduced as base properties in the simulation program were also experimentally obtained by the direct method. The present work consists of replicating the experimental data, namely the load-displacement (P-δ) curves, to validate the obtained cohesive laws for the different tested tA. The triangular CZM was selected for this work. As a result of this study, CZM laws for the Sikaforce® 7752 were proposed and validated for the design of bonded structures, thus expediting the entire process.
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