Numerical Simulation Method for Failure Pressure of Buried Dented Pipeline

Abstract

In view of the important influence of mechanical damage on the bearing capacity of buried pipelines, the residual strength of dented pipelines has become a hot issue in the pipeline industry. In this paper, X52 steel grade, commonly used in buried pipelines, is taken as the research object. The material properties are obtained by tensile test. The difference of curvature radius at the tip of the dent is accurately considered. Based on finite element method, the limit depth and the failure pressure of the dented pipelines are studied. Results have shown that the ultimate displacement load increases exponentially with the increase in the radius of curvature. When dent depth is small, the dent will not reduce the failure pressure, no matter it is smooth or sharp. As the dent depth increases, the influence of the radius of curvature at the tip of the dent becomes significant. The critical radius of curvature from sharp dent to smooth dent is analyzed. And the corresponding relationship between it and dent depth is obtained. It is found that when the radius of curvature exceeds 50 mm, the dent depth does not affect the failure pressure of the pipeline. An expression about the two parameters is put forward, providing supplementary suggestions for the depth-based evaluation criterion. This paper affords a strong support for better assessment of dented pipelines.

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Abbreviations

\(D\) :

The outside diameter of the pipe (mm)

\(t\) :

The wall thickness of the pipe (mm)

\(h_{0}\) :

Dent depth without spring back/displacement load of the indenter (mm)

\(h\) :

Dent depth after spring back (mm)

\(h_{\lim }\) :

The ultimate displacement load (mm)

\(h_{\text{crit}}\) :

The critical dent depth (mm)

\(E\) :

Elastic modulus (GPa)

\(\mu\) :

Poisson’s ratio

\(\sigma_{\text{s}}\) :

Engineering yield strength (MPa)

\(\sigma_{\text{u}}\) :

Engineering tensile strength (MPa)

\(\sigma_{\text{u}}^{\prime }\) :

True tensile strength (MPa)

\(r\) :

Radius of curvature of the indenter/dent (mm)

\(r_{\text{crit}}\) :

The critical radius of curvature (mm)

\(p\) :

Internal pressure (MPa)

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Tian, X., Lu, M. & Chen, Y. Numerical Simulation Method for Failure Pressure of Buried Dented Pipeline. J Fail. Anal. and Preven. (2020). https://doi.org/10.1007/s11668-020-00897-8

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Keywords

  • Ultimate displacement load
  • Failure pressure
  • Finite element method
  • Critical radius of curvature
  • Evaluation methods