Issue 49

E. Abdelouahed et alii, Frattura ed Integrità Strutturale, 49 (2019) 690-697; DOI: 10.3221/IGF-ESIS.49.62

Pipeline repair by composite patch under temperature and pressure loading

E. Abdelouahed, H. Benzaama Laboratoire LABAB, Ecole Nationale Polytechnique Maurice Audin, Oran, Algeria heabamine@gmail.com, habenza@yahoo.fr M. Mokhtari Laboratoire LaRTFM, Ecole Nationale Polytechnique Maurice Audin, Oran, Algeria mokhtarimohamed44@yahoo.fr B. Aour Laboratoire LABAB, Ecole Nationale Polytechnique Maurice Audin, Oran, Algeria ben_aour@yahoo.fr A BSTRACT . In this study, the three-dimensional finite element method is used to analyze an API 5L X70 steel cylindrical pipeline subjected to an internal pressure load by calculating the stress intensity factors and the integral J at the peak of crack in elastic and elastoplastic behavior. The effectiveness of composite patch repair bonded to the cracked surface is highlighted. The effects of the geometrical and mechanical properties of the composite patch and the adhesive on the effectiveness of the repair were highlighted. The variation of the stress intensity factor at the crack tip is used to evaluate the repair performance. The results obtained show that the residual heat stress significantly increases the stress intensity factor at the bottom of the crack, which reduces the effectiveness of the repair. K EYWORDS . FEM; Repair by composite patch; Pipeline; Cracking; Thermal stress; Internal pressure; Temperature; Stress intensity factor.

Citation: E. Abdelouahed, H. Benzaama, M. Mokhtari, B. Aour, Pipeline repair by composite patch under temperature and pressure loading, Frattura ed Integrità Strutturale, 49 (2019) 690-697.

Received: 21.04.2019 Accepted: 15.05.2019 Published: 01.07.2019

Copyright: © 2019 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

lobal energy demands continue to rise with the rapid development of the global economy. [1] Pipeline transportation of oil and gas is the safest and cheapest way for hydrocarbon transportation companies. [2] To increase the profitability of a pipeline, the flow is often increased by increasing the service pressure. [3] Considerable research work is available in the literature on the various aspects of bonded composite joints. Several design parameters play an important role in the technology of composite patches, [4] such as patch size, patch shape, material selection, patch, ambient temperature, size of heating zones, etc.., the importance and effects of some of the design parameters discussed. G

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