Numerical investigation of the SIFs of the external surface crack in rigid pipe reinforced with FRP

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Abstract

Fatigue is one of the major challenges of offshore rigid pipes. The surface crack is the main manifestation. Fatigue cracks are evolved from surface cracks which are frequently appear in the external surface of rigid pipes. Under fatigue loads, the surface cracks may continue to propagate and finally develop into penetrated cracks, which may cause leakage and serious accidents.
Fiber-reinforced polymer (FRP) strengthening technology is already a reliable technique for structure maintenance in onshore pipelines and penetrated cracks in load-bearing circular hollow sections (CHS). Nevertheless, the research gap of surface crack in rigid pipes reinforced with FRP is seriously restricting the development of FRP reinforcement application.
This paper aims to investigate the surface crack growth in the external surface of rigid pipes reinforced with FRP under bending. Stress intensity factors along the crack front are computed through finite-element (FE) models. The numerical results show that under FRP reinforcement, surface crack growth rate decreases significantly which ensures the safety use of rigid pipes in offshore industry.
Original languageEnglish
Title of host publicationProceedings of the 32nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2018)
Pages1-6
Publication statusPublished - 2018
EventTEAM 2018: 32nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures - Wuhan, China
Duration: 15 Oct 201818 Oct 2018

Conference

ConferenceTEAM 2018: 32nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures
CountryChina
CityWuhan
Period15/10/1818/10/18

Keywords

  • offshore rigid pipe
  • external surface crack
  • stress intensity factor
  • finite element method

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