Analysis of Repaired Cracks With Bonded Composite Wrap in Pipes Under Bending

[+] Author and Article Information
Aida Achour

Department of Mechanical Engineering,
University Ibn Badis of Mostaganem,
Mostaganem 27000, Algeria
e-mail: ar.aida@yahoo.fr

Abdulmohsen Albedah, Faycal Benyahia

Mechanical Engineering Department,
College of Engineering,
King Saud University,
Riyadh 11421, Saudi Arabia
e-mail: albedah@ksu.edu.sa

Bel Abbes Bachir Bouiadjra

Department of Mechanical Engineering,
University of Sidi Bel Abbes,
BP 89, Cité Ben M'hidi,
Sidi Bel Abbes 22000, Algeria
e-mails: bachirbou@yahoo.fr;

Djamel Ouinas

Department of Mechanical Engineering,
University Ibn Badis of Mostaganem,
Mostaganem 27000, Algeria

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 25, 2015; final manuscript received April 13, 2016; published online July 18, 2016. Editor: Young W. Kwon.

J. Pressure Vessel Technol 138(6), 060909 (Jul 18, 2016) (6 pages) Paper No: PVT-15-1171; doi: 10.1115/1.4033449 History: Received July 25, 2015; Revised April 13, 2016

Composite materials have been used to structurally repair piping and other facilities for many years. However, the original use of composite materials was for repairing corroded pipelines where the intent was to restore strength to the damaged section of the pipeline. In addition to repairing corrosion, composite materials have successfully been used to repair dents, wrinkle bends, induction bends, and pipe fittings including elbows and tees as well as repair of offshore risers. In this study, the behavior of circumferential through cracks in repaired pipe with bonded composite wrap subjected to bending moment is investigated using three-dimensional finite-element analysis. The stress intensity factor (SIF) is utilized as a fracture criterion. The effects of the mechanical and geometrical properties of the adhesive on the variation of the SIF at the crack front were also analyzed. The obtained results show that the presence of the bonded composite repair significantly reduces the SIF, which can improve the residual lifespan of the pipe. Meanwhile, the SIF is also reduced as the elastic and the geometrical wrap properties are improved, particularly when the Young's modulus of the adhesive and the wrap thickness are increased.

Copyright © 2016 by ASME
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Fig. 1

Repaired pipe under moment

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Fig. 2

Geometrical model of the pipe and the crack

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Fig. 3

Typical mesh model of the global structure

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Fig. 4

Mesh model at the crack front

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Fig. 5

Distribution of the SIF along the crack front for repaired and unrepaired cracks

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Fig. 6

SIF versus crack angle at the external crack tip

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Fig. 7

SIF versus crack angle at the internal and external tips of the crack

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Fig. 8

SIF distribution along the crack front for various Young's modulus of the adhesive

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Fig. 9

SIF versus the adhesive Young's modulus

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Fig. 10

SIF versus adhesive thickness at the external crack tip

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Fig. 11

SIF versus plies number of the composite wrap at the external crack tip




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