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Prediction of stiffness degradation in composite laminate with transverse cracking and delamination under hygrothermal conditions-desorption case

  • B. Boukert (Aeronautical Sciences Laboratory, Institute of Aeronautics and Space Studies, University of Blida 1) ;
  • M. Khodjet-Kesba (Aeronautical Sciences Laboratory, Institute of Aeronautics and Space Studies, University of Blida 1) ;
  • A. Benkhedda (Aeronautical Sciences Laboratory, Institute of Aeronautics and Space Studies, University of Blida 1) ;
  • E.A. Adda Bedia (Laboratory of Materials and Hydrology, University of Sidi Bel Abbes)
  • Received : 2023.12.16
  • Accepted : 2024.04.02
  • Published : 2024.03.25
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Abstract

The stiffness reduction of cross-ply composite laminates featuring a transverse cracking and delamination within the mid-layer is predicted through utilization of a modified shear-lag model, incorporating a stress perturbation function. Good agreement is obtained by comparing the prediction models and experimental data. The material characteristics of the composite are affected by fluctuations in temperature and transient moisture concentration distribution in desorption case, based on a micro-mechanical model of laminates. The transient and non-uniform moisture concentration distribution induces a stiffness reduction. The obtained results demonstrate the stiffness degradation dependence on factors such as cracks density, thickness ratio and environmental conditions. The present study underscores the significance of comprehending the degradation of material properties in the failure progression of laminates, particularly in instances of extensive delamination growth.

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References

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