External surface cracked offshore steel pipes reinforced with composite repair system subjected to cyclic bending: An experimental investigation

Zongchen Li, Xiaoli Jiang, Hans Hopman, Ling Zhu, Zhiping Liu

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In this paper, we experimentally studied the external surface crack growth in steel pipes reinforced with Composite System Repaired (CRS). CRS reinforced surface cracked API 5L X65 pipes were tested, containing three initial notch sizes and four reinforcement schemes. During the tests, the crack growth results, as well as the strain on the external mid-bottom composite laminate around the cracked area, and the vertical deflection of the specimens were recorded. The results showed that within the surface crack growth stage, the composite laminates were adequately bonded on the steel substrate, which significantly decreased the crack growth rate and prolonged the residual fatigue life. In addition, CRS reinforcement has increased the stiffness of the surface cracked pipes. Through the analysis on applying different reinforcement schemes, we indicated that increasing the amount of composite layers evidently facilitated the reinforcement effectiveness, while increasing the bond length did not; and the inversely diagonal wrapping pattern performance less effective.

Original languageEnglish
Article number102703
Number of pages13
JournalTheoretical and Applied Fracture Mechanics
Volume109
DOIs
Publication statusPublished - 2020

Keywords

  • Composite repair system
  • Experimental investigation
  • External surface crack
  • Fatigue crack growth rate
  • Offshore steel pipes
  • Structural integrity

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