RELIABLE DIMENSIONING OF DAMAGED CYLINDRICAL METALLIC STRUCTURES REINFORCED WITH BIOCOMPOSITES
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Date
2024-05-23
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HOCINE Abdelkader / MEDJDOUB Sidi Mohamed
Abstract
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.
Description
THESIS
Submitted in fulfillment of the requirements for the degree of:
DOCTORATE (SCIENCE)
Field: Mechanical Engineering
Specialty: Mechanical Construction