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Steel and Composite Structures
  Volume 20, Number 4, March20 2016, pages 951-962

Numerical analysis of the Influence of the presence of disbond region in adhesive layer on the stress intensity factors (SIF) and crack opening displacement (COD) in plates repaired with a composite patch
Aicha Benchiha, Kouider Madani, Sebastien Touzain, Xavier Feaugas and Mohan Ratwani

    The determination of the stress intensity factor at the crack tip is one of the most widely used methods to predict the fatigue life of aircraft structures. This prediction is more complicated for repaired cracks with bonded composite patch. This study is used to compute the stress intensity factor (SIF) and crack opening displacement (COD) for cracks repaired with single and double-sided composite patches. The effect of the presence of disbond region in adhesive at the crack was taken into consideration. The results show that there is a considerable reduction in the asymptotic value of the stress-intensity factors and the crack opening displacement at the crack tip. The use of a double-sided patch suppresses the bending effect due to the eccentricity of the patch on one side only.
Key Words
    stress intensity factor (SIF); crack opening displacement (COD); crack; bonded composite repair; disbond
(1) Aicha Benchiha, Kouider Madani:
LMPM, Department of Mechanical Engineering, University of Sidi Bel Abbes, Cité Ben M'hidi, Sidi Bel Abbes, Algeria;
(2) Sebastien Touzain, Xavier Feaugas:
La Rochelle University, Laboratoire des sciences pour l'ingénieur pour l'environnement (LASIE), La Rochelle, France;
(3) Mohan Ratwani:
R-Tec, Rolling Hills Estates, CA 90274, USA.

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