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

Journal Article (2018)
Author(s)

Jie Cai (TU Delft - Transport Engineering and Logistics)

X Jiang (TU Delft - Transport Engineering and Logistics)

Gabriel Lodewijks (University of New South Wales)

Zhiyong Pei (Wuhan University of Technology)

Weiguo Wu (Wuhan University of Technology)

Research Group
Transport Engineering and Logistics
Copyright
© 2018 J. Cai, X. Jiang, G. Lodewijks, Zhiyong Pei, Weiguo Wu
DOI related publication
https://doi.org/10.1016/j.marstruc.2018.05.006
More Info
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Publication Year
2018
Language
English
Copyright
© 2018 J. Cai, X. Jiang, G. Lodewijks, Zhiyong Pei, Weiguo Wu
Research Group
Transport Engineering and Logistics
Volume number
61
Pages (from-to)
188-201
Reuse Rights

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Abstract

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.

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