In this paper structural adhesives for innovative bonded connections of aluminum structures are investigated by means of experimental and numerical modelling. Cylindrical specimens of different sections bonded with different adhesive joint thicknesses are tested under axial loading, using an Arcan Device. Thanks to X-ray micro-tomography, three-dimensional scan of the adhesive joints is performed in order to detect binder defects and to evaluate the porosity rate in volume, which are proved to affect the structural performance. Numerical simulations are carried out implementing the Imperfect Interface Approach (IIA), which coherently combines arguments of asymptotic theory and homogenization techniques for microcracked materials in the context of Non-Interacting Approximation (NIA). Experimental and numerical results are found to be in good agreement by adopting a Kachanov type material. Finally, a simple analytical validation of the numerical results is performed. The present investigation outcomes are addressed to contribute further developments, and to update the UE technical legislation in the field of aluminum bonded connections.

Bonded connections of aluminum structures: Experimental and numerical investigation

Lebon F.;Rigattieri F.
;
Rizzoni R.;Aprile A.
2020

Abstract

In this paper structural adhesives for innovative bonded connections of aluminum structures are investigated by means of experimental and numerical modelling. Cylindrical specimens of different sections bonded with different adhesive joint thicknesses are tested under axial loading, using an Arcan Device. Thanks to X-ray micro-tomography, three-dimensional scan of the adhesive joints is performed in order to detect binder defects and to evaluate the porosity rate in volume, which are proved to affect the structural performance. Numerical simulations are carried out implementing the Imperfect Interface Approach (IIA), which coherently combines arguments of asymptotic theory and homogenization techniques for microcracked materials in the context of Non-Interacting Approximation (NIA). Experimental and numerical results are found to be in good agreement by adopting a Kachanov type material. Finally, a simple analytical validation of the numerical results is performed. The present investigation outcomes are addressed to contribute further developments, and to update the UE technical legislation in the field of aluminum bonded connections.
9780429343292
Aluminium structures, Axial loading, Cylindrical specimens, Experimental investigations, Numerical investigations, Numerical results, Porosity rate, Structural adhesive, Structural performance, X-ray micro tomographies
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2470305
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