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Strength prediction of adhesively-bonded scarf repairs in composite structures under bending

By R. D. S. G. Campilho, M. F. S. F de Moura, A. M. G. Pinto, D. A. Ramantani, J. J. L. Morais and J. J. M. S. Domingues


This work reports on the experimental and numerical study of the bending behaviour oftwo-dimensional adhesively-bonded scarf repairs of carbon-epoxy laminates, bonded with theductile adhesive Araldite 2015®. Scarf angles varying from 2 to 45º were tested. The experimentalwork performed was used to validate a numerical Finite Element analysis using ABAQUS® and amethodology developed by the authors to predict the strength of bonded assemblies. Thismethodology consists on replacing the adhesive layer by cohesive elements, including mixed-modecriteria to deal with the mixed-mode behaviour usually observed in structures. Trapezoidal laws inpure modes I and II were used to account for the ductility of the adhesive used. The cohesive lawsin pure modes I and II were determined with Double Cantilever Beam and End-Notched Flexuretests, respectively, using an inverse method. Since in the experiments interlaminar and transverseintralaminar failures of the carbon-epoxy components also occurred in some regions, cohesive lawsto simulate these failure modes were also obtained experimentally with a similar procedure. A goodcorrelation with the experiments was found on the elastic stiffness, maximum load and failure modeof the repairs, showing that this methodology simulates accurately the mechanical behaviour ofbonded assemblies

Topics: Outras ciências da engenharia e tecnologias, Other engineering and technologies, Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias, Engineering and technology::Other engineering and technologies
Year: 2009
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