Issue 50

M. Belhamiani et alii, Frattura ed Integrità Strutturale, 50 (2019) 623-637; DOI: 10.3221/IGF-ESIS.50.53 623 J integral computation and limit load analysis of bonded composite repair in cracked pipes under pressure M. Belhamiani, D. E. Belhadri, W. Oudad, O. Mansouri, W. N. Bouzitouna Smart Structures Laboratory Univ Ctr of Ain Témouchent, Po Box 284,46000, Algeria mbelhamiani@gmail.com, https://orcid.org/0000-0001-8951-032X djamelins@hotmail.fr oudadw@gmail.com, https://orcid.org/0000-0002-3283-1322 omansouri81@gmail.com hibanesrine@outlook.fr A BSTRACT . In this paper an additional criterion was introduced to evaluate the composite repair systems using the limit load analysis. The plastic collapse pressure of API 5L X65 PSL2 steel pressure vessel structure with crack defect is numerically investigated after the structure was been repaired by composite overwrap. The objective of this study was the analysis of the efficiency of composite repair systems using this additional criterion to gain more confidence on it taking into account, the cracks and the overwrap geometries. The material of the pipe is elastic perfectly plastic for the plastic collapse pressure criterion and elastic-plastic using the Romberg Osgood model for fracture mechanic criterion. The additional criterion allows us to compare the uncracked and cracked pipe to estimate the repair efficiency. Moreover, the composite overwrap could restore 90% of the plastic collapse pressure for cracked pipes. K EYWORDS . J integral; API 5L X65; Limit load; Romberg Osgood model; crack; Pipe. Citation: Belhamiani, M., Belhadri, D. E., Oudad, W., Mansouri, O., Bouzitouna, W., N., J integral computation and limit load analysis of bonded composite repair in cracked pipes under pressure, Frattura ed Integrità Strutturale, 50 (2019) 623-637. Received: 09.08.2019 Accepted: 10.09.2019 Published: 01.10.2019 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 raditionally, mechanical defects in pipes and pipelines which have been detected either by working on the pipeline or by intelligent pigging have been repaired by replacing the defective areas. The use of thermosetting plastics and reinforcing fibers has a long and varied history of being used as a repair material for structural repairs. The fabric options consist primarily of Carbon, Kevlar or Glass fibers, which are bound together and bonded to the pipe with various resin options [1]. T