Numerical Study on Rehabilitation of the Pressurized Pipes Containing Longitudinal External Crack using CFRP under Service Load

Document Type : Solid Mechanics

Author

Assistant Professor, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran

Abstract

In recent years, there has been a substantial growth in the utilization of CFRP (Carbon Fiber Reinforced Polymer) composite materials for repairing and reinforcing pipes. This method offers notable advantages, including rapid installation, the feasibility of implementation under service conditions, and cost-effectiveness. The repair and reinforcement of pressurized pipes, particularly in cases where taking the pipe out of service is not feasible, present challenges. Traditional options such as replacing damaged sections or welding on pipes in service become impractical. CFRP emerges as a valuable solution in such scenarios. Nevertheless, the distinct properties of steel and composite materials pose significant challenges to their efficacy. This research employs numerical modeling to investigate the repair and strengthening of pipes with longitudinal cracks under different internal pressures and service conditions. The findings indicate that the presence of initial pressure before applying CFRP diminishes the pipe's capacity. This reduction is attributed to the limited contribution of CFRP to load-bearing at low pressures, owing to the disparate modulus of elasticity between CFRP and steel. However, the rate of capacity reduction decreases with higher initial pressures, highlighting the complexities involved in effectively utilizing CFRP for repairing pressure pipes.

Highlights

  • Rehabilitation of cracked pressurized pipe
  • Rehabilitation of pressurized pipes under service load
  • Investigation of plastic deformation on bearing load of CFRP

Keywords

References

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Aerospace Mechanics
Volume 20, Issue 2 - Serial Number 76
Serial No. 75, Summer
July 2024
Pages 29-38

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History

  • Receive Date: 30 December 2023
  • Revise Date: 10 January 2024
  • Accept Date: 25 February 2024
  • Publish Date: 21 June 2024

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