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Browsing by Author "Carbas, R.J.C."

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  • Experimental and numerical failure analysis of aluminium/composite single-L joints
    Publication . Domingues, N.R.E.; Campilho, Raul; Carbas, R.J.C.; Silva, L.F.M. da
    Adhesive bonding is frequently used to manufacture complex-shaped structures. Fibre-reinforced composite materials are extensively used in many industries, such as boat building, automotive and aeronautical. Although the manufacturing methods reduce the connections to the minimum, these are still necessary due to component size and design, technological and logistical limitations. Frequently, the combination of composites with metals such as aluminium or titanium brings design benefits. This work aims to study, by experimentation and cohesive zone modelling (CZM), single-L adhesive joints between aluminium components and carbon-epoxy composites under a peel loading, considering different joint configurations and adhesives of distinct ductility. The addressed geometric parameter is the L-part thickness (tP2). The numerical analysis included the stress distributions, damage evolution, strength and failure modes. The experimental tests validated the numerical results and provided design guidelines for single-L joints. It was shown that the L-part geometry and adhesive type highly influence the joints׳ strength.
    2016Journal article Restricted access Show more
  • Strength and damage growth in composite bonded joints with defects
    Publication . Ribeiro, F.M.F.; Campilho, Raul; Carbas, R.J.C.; Silva, L.F.M. da
    The use of adhesive joints is increasing in various industrial applications because of their advantages such as weight reduction, reduction of stress concentrations and ease of manufacture. However, one of the limitations of adhesive joints is the difficulty in predicting the joint strength due to the presence of defects in the adhesive. This paper presents an experimental and numerical study of single-lap joints (SLJ) with defects centred in the adhesive layer for different overlap lengths (LO) and adhesives. The numerical analysis by cohesive zone models (CZM) included the analysis of the peel (σy) and shear (τxy) stress distributions in the adhesive layer, the CZM damage variable study and the strength prediction. The joints’ behaviour was accurately characterized by CZM and showed a distinct behaviour as a function of the defect size, depending on the adhesive.
    2016Journal article Restricted access Show more