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Advances in Aircraft and Spacecraft Science
  Volume 6, Number 4, July 2019 , pages 315-331

Hygrothermal effect on the moisture absorption in composite laminates with transverse cracks and delamination
Mohamed Khodjet Kesba, A. Benkhedda, E.A. Adda bedia and B. Boukert

    The stiffness degradation of the cross-ply composite laminates containing a transverse cracking and delamination in 90o layer is predicted by using a modified shear-lag model by introducing the stress perturbation function. The prediction shows better agreement with the experimental results published by Ogihara and Takeda 1995, especially for laminates with thicker 90o plies in which extensive delamination occurs. A homogenised analytic model for average transient moisture uptake in composite laminates containing periodically distributed matrix cracks and delamination is presented. It is shown that the model well describes the moisture absorption in a cross-ply composite laminate containing periodically distributed transverse matrix cracks in the 90o plies. The obtained results represent well the dependence of the stiffness degradation on the crack density, thickness ratio and moisture absorption. The present study has proved to be important to the understanding of the degradation of the material properties in the failure process when the laminates in which the delamination grows extensively.
Key Words
    delamination; stiffness; hygrothermal effect; absorption; matrix cracks
Mohamed Khodjet Kesba, A. Benkhedda and B. Boukert: Laboratoire des Sciences Aéronautiques, Institut d\'Aéronautique et des études Spatiales, Université de Blida1, Blida, Algérie

E.A. Adda bedia: Laboratoire des Matériaux et Hydrologie, Université de Sidi Bel Abbes, Algérie, Sidi Bel Abbes, Algérie

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