Local buckling and method for predicting ultimate compressive strain of pipeline with kinked dent

ABSTRACT

Bending loads can lead to local buckling in pipelines with kinked dents. The Finite Element Method is adopted to establish the numerical model of the pipeline with kinked dent. The local buckling failure mechanism of pipeline with kinked dent under bending load is investigated. In addition, the influence of parameters such as the dent depth, dent angle and pipe properties on the failure mode and ultimate compressive strain is analysed. It is found that the depth of the dent depth significantly affects the buckling failure mode and ultimate compressive strain. In addition, the larger the dent angle and the yield ratio, the smaller the ultimate compressive strain capacity. The larger the internal pressure and pipeline diameter thickness ratio, the larger the ultimate compressive strain. Based on the numerical results, the method for predicting the ultimate compressive strain of pipeline with kinked dent is proposed.

KEYWORDS:

• Oil and gas pipeline
• kinked dent
• local buckling
• ultimate compressive strain
• integrity assessment

Acknowledgements

The work was financially supported by National Science Foundation of China (Grant Number 52171285), Open Project Program of State Key Laboratory of Structural Analysis for Industrial Equipment (Grant Number GZ19119), Science Foundation of China University of Petroleum, Beijing (Grant Number 2462020YXZZ045).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Science Foundation of China: [Grant Number 52171285].