Browsing by Author "Fouad Sodki KARA ACHIRA"

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    RELIABLE DIMENSIONING OF DAMAGED CYLINDRICAL METALLIC STRUCTURES REINFORCED WITH BIOCOMPOSITES
    (HOCINE Abdelkader / MEDJDOUB Sidi Mohamed, 2024-05-23) Fouad Sodki KARA ACHIRA
    In order to optimise the repair of corroded pipes by reinforcement and to replace conventional synthetic solutions, this thesis focuses primarily on the determination of the optimal geometric parameters of a multi-layer natural fibre-based composite wrap. In the first part, a deterministic numerical prediction of the failure pressure for a corroded pipeline before and after repair using synthetic and natural composite materials is developed, incorporating non-linear behaviour. The effects of the length, width and depth of the corroded area on the failure pressure are investigated and a comparison is made between the performance of synthetic patches and biocomposite wraps. The second and final part of the thesis deals with the optimisation of geometric parameters for a multi-layer natural fibre-based composite wrap used in the repair of corroded pipelines. The aim is to replace conventional synthetic solutions with natural wraps using Design of Experiment (DoE), Multiple Nonlinear Regression Analysis (MNRA) and Stochastic Search approaches. The performance of the proposed natural fibre solution is evaluated by assessing Von Mises Stresses (VMS). Three geometric parameters of the composite winding and their interactions are considered: Length (Lp), Number of Plies (NPp) and Recovery Angle (RAp). A comparison between the optimal configurations of the biocomposite patch is developed using MODDE and Differential Evolution. Where an optimal reinforcement of the corroded area of the pipe, the following parameters are proposed.