Issue 46

S.M. Medjdoub et alii, Frattura ed Integrità Strutturale, 46 (2018) 102-112; DOI: 10.3221/IGF-ESIS.46.11 102 Developments in the fracture and fatigue assessment of materials and structures Optimization of the geometrical parameters of bonded composite wrap for repairing cracked pipelines Sidi Mohamed Medjdoub University of Djillali Liabes, Sidi Bel Abbes, Algeria medjdoubsm@gmail.com Belabbes Bachir Bouadjra University of Djillali Liabes, LPMM Laboratory, Sidi Bel Abbes, Algeria bachirbou@yahoo.fr Miloudi Abdelkader University of Djillali Liabes, LMSR Laboratory, Sidi Bel Abbes, Algeria miloudidz@yahoo.fr A BSTRACT . In this study the finite element method is used to analyze the performances of bonded composite wrap repair of cracked steel pipelines. Parametric analysis was performed in order to highlight the effects of the geometrical properties on the repair efficiency. The experimental design method is used to explore the effects of wrap dimensions (length, angle and thickness) in order to optimize the repair process. We showed in using the MOODE.5 software the most dominant geometrical parameters on stress intensity factor at the crack front which to determine the most important parameters on the repair efficiency. This optimization can help the composite wrap designers to improve the repair performance and rehabilitation. K EYWORDS . Fracture mechanics; Crack; Composite; Wrap; Pipelines. Citation: Medjdoub, S.M., Bachir Bouadjra, B., Miloudi, A., Optimization of the geometrical parameters of bonded composite wrap for repairing cracked pipelines, Frattura ed Integrità Strutturale, 46 (2018) 102-112. Received: 06.05.2018 Accepted: 28.06.2018 Published: 01.10.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he oil and gas are transported by steel pipelines in industry better than the storage tanks. The operating conditions are in subjected to hard environments and extreme loading conditions. Mechanical damages are common in operating pipelines. They are damage in the coating, erosion and corrosion which can lead principal problem met in industry to internal and external crack in the structure of the pipeline. According to the gravity of the problem, the harmful effects are the pressure bearing capability in the pipeline and they can reduce his lifespan or a failure of the structure [1-5]. The best means of reparation of canalization is the bonded composite wrap because he is installed during T