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Collapse analysis of imperfect subsea pipelines based on 2D high-order nonlinear model

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Abstract

To study the collapse of imperfect subsea pipelines, a 2D high-order nonlinear model is developed. In this model, the large deformation of the pipes is considered by retaining the high-order nonlinear terms of strain. In addition, the J 2 plastic flow theory is adopted to describe the elastoplastic constitutive relations of material. The quasi-static process of collapse is analyzed by the increment method. For each load step, the equations based on the principle of virtual work are presented and solved by the discrete Newton’s method. Furthermore, finite element simulations and full-scale experiments were preformed to validate the results of the model. Research on the major influencing factors of collapse pressure, including D/t, material type and initial ovality, is also presented.

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Authors and Affiliations

  1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China

    Jianxing Yu  (余建星), Zhibo Li  (李智博), Yuan Yang  (杨 源) & Zhenzhou Sun  (孙震洲)

Authors
  1. Jianxing Yu  (余建星)
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  2. Zhibo Li  (李智博)
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  3. Yuan Yang  (杨 源)
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  4. Zhenzhou Sun  (孙震洲)
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Corresponding author

Correspondence to Jianxing Yu  (余建星).

Additional information

Supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China (No. 2011ZX05026-005), the National Natural Science Foundation of China (No. 51239008) and the National Basic Research Program of China (“973” Program, No. 2014CB046800).

Yu Jianxing, born in 1958, male, Dr, Prof.

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Yu, J., Li, Z., Yang, Y. et al. Collapse analysis of imperfect subsea pipelines based on 2D high-order nonlinear model. Trans. Tianjin Univ. 20, 157–162 (2014). https://doi.org/10.1007/s12209-014-2116-y

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  • DOI: https://doi.org/10.1007/s12209-014-2116-y

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