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Structural Engineering and Mechanics
  Volume 84, Number 6, December25 2022 , pages 799-811

Impact of bonding defect on the tensile response of a composite patch-repaired structure: Effect of the defect position and size
N. Kaddouri, K. Madani, S.CH. Djebbar, M. Belhouari and R.D.S.G. Campliho

    Adhesive bonding has seen rapid development in recent years, with emphasis to composite patch repairing processes of geometric defects in aeronautical structures. However, its use is still limited given its low resistance to climatic conditions and requirement of specialized labor to avoid fabrication induced defects, such as air bubbles, cracks, and cavities. This work aims to numerically analyze, by the finite element method, the failure behavior of a damaged plate, in the form of a bonding defect, and repaired by an adhesively bonded composite patch. The position and size of the defect were studied. The results of the numerical analysis clearly showed that the position of the defect in the adhesive layer has a large effect on the value of J-Integral. The reduction in the value of J-Integral is also related to the composite stacking sequence which, according to the mechanical properties of the ply, provides better load transfer from the plate to the repair piece through the adhesive. In addition, the increase in the applied load significantly affects the value of the J-Integral at the crack tip in the presence of a bonding defect, even for small dimensions, by reducing the load transfer.
Key Words
    bonding defect; J-integral; peel stress; repair patch; shear stress
N. Kaddouri, K. Madani, S.CH. Djebbar, M. Belhouari: Department of Mechanical Engineering, University of Sidi Bel Abbes, BP 89 Cité Ben M

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