Journal of Failure Analysis and Prevention

, Volume 19, Issue 1, pp 212–218 | Cite as

Failure Analyses of Propagation of Cracks in Repaired Pipe Under Internal Pressure

  • M. SalemEmail author
  • B. Mechab
  • M. Berrahou
  • B. Bachir Bouiadjra
  • B. Serier
Technical Article---Peer-Reviewed


In this study, the analysis of the behavior of circumferential through-wall cracks in repaired elbow with bonded composite patch subjected to internal pressure is performed using three-dimensional finite element analyses. The effect of length cracks, the wall thickness (Rm/t), angle of the elbow (ψ) and properties of the patch is presented for calculating the stress intensity factors. The obtained results show that the bonded composite repair significantly reduces the stress intensity factors at the tip of repaired cracks. The Monte Carlo method is used to predict the distribution function of the mechanical response. According to the obtained results, we note that the crack length variations are important factors influencing the distribution function of KI. The uncertainty in this parameter has a significant effect on increasing the probability of failure of pipe and reducing the durability of structure.


Failure Pipe Composite Fracture mechanics Safety 

List of symbols




Stress intensity factors (SIF)


Strain hardening index in the (R–O) Ramberg–Osgood


Internal pressure


Wall thickness of the cylinder


Coefficient for the (R–O) Ramberg–Osgood


Normalizing strain


Angle of the elbow


Half circumferential angle of a circumferential crack


Mean cross-sectional radius of the elbow


Mean diameter of elbow cross section


Poisson’s ratio


Yield stress


Ultime stress


Finite element method



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Copyright information

© ASM International 2019

Authors and Affiliations

  • M. Salem
    • 1
    Email author
  • B. Mechab
    • 1
  • M. Berrahou
    • 1
  • B. Bachir Bouiadjra
    • 1
  • B. Serier
    • 1
  1. 1.LMPM, Department of Mechanical EngineeringUniversity of Sidi Bel AbbesSidi Bel AbbèsAlgeria

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