A new criterion based on strain determination for dent assessment of pipelines

Zhao, Jian; Cheng, Y. Frank

doi:10.1016/j.jpse.2021.11.004

Cited by 12 publications

(1 citation statement)

References 16 publications

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“…Dents are one common type of mechanical damages on pipelines, where a permeant plastic deformation occurs locally. Dents can be produced by impact of rocks, soil movement or excavation (Garbatov and Soares 2017;Andrews et al 2022;Zhao and Cheng 2022a;Wang et al 2023). In addition, gas pipelines usually experience frequent pressure fluctuations (Liu et al 2016;Gu et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of the hydrogen atom distribution on dented pipeline for hydrogen transport under cyclic loading

Zhao

Cheng

2023

Preprint

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Repurposing existing natural gas pipelines for hydrogen transport requires an accurate assessment of the distribution of hydrogen (H) atoms at surface defects such as dents under frequent pressure fluctuations encountered on gas pipelines. In this work, a 3-dimensional finite element-based model was developed to determine the stress/strain and H atom concentrations at an unconstrained dent on an X52 steel pipe experiencing denting, spring-back and cyclic loading processes. As expected, a stress/strain concentration generates at the dent center, while the cyclic loading reduces the stress level and shifts the stress concentration zone from the dent center along the circumferential direction. As the dent depth increases, the maximum H atom concentration is further shifted from the dent center to the side. A coincident relationship between the maximum H atom concentration, von Mises stress, hydrostatic stress and plastic strain does not exist. Pressure fluctuations decrease both the stress and H atom concentrations, providing a beneficial effect on reduced risk of the dented pipelines to hydrogen embrittlement in high-pressure hydrogen gas environments. Further analysis shows that the indenter size has little influence on the H distribution in the dent area.

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