Residual ultimate strength of damaged seamless metallic pipelines with combined dent and metal loss

Jie Cai*, Xiaoli Jiang, Gabriel Lodewijks, Zhiyong Pei, Weiguo Wu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)
11 Downloads (Pure)


The combination damage induced by mechanical interference, in reality, is more likely to happen. In this paper, numerical models on pipes with combined dent and metal loss in terms of a notch are developed and validated through tests (diameter-to-thickness ratio D/t of test pipes around 21), capable of predicting the residual ultimate strength of pipes in terms of bending moment (Mcr) and critical curvature (κcr). The effect of residual stress is explored, assuming a linear distribution in the pipe hoop direction. Investigations of damaged pipes with different D/t (15–50) are carried out. Through changing damage parameters in the combinations, i.e. dent depth (dd) or metal loss depth (dm), the corresponding effects of damage are clarified. Results show that the combined dent and notch damage is a more severe type of damage on pipe strength compared with other damage types (excluding fracture). The dent in combined damage plays a more dominant role on the pipe residual strength. Empirical formulas are proposed to predict residual ultimate strength of damaged metallic pipes (D/t around 21) with combined dent and metal loss under bending moment, which can be used for practical purposes. The application domain can be expanded to pipes with D/t up to 30 based on simulations.

Original languageEnglish
Pages (from-to)188-201
JournalMarine Structures
Publication statusPublished - 2018

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Combined dent and metal loss
  • Metallic pipelines
  • Nonlinear FEM
  • Pipe tests
  • Residual stress
  • Residual ultimate strength


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