Plastic damage analysis of oil and gas pipelines with unconstrained and constrained dents

Li, Chengbing; Dang, S.

doi:10.1016/j.engfailanal.2017.02.009

Cited by 21 publications

(3 citation statements)

References 11 publications

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“…The 120 • range of the bottom of the pipe model was restrained in the Y direction [26]. Symmetrical constraints were applied to the proximal boundary and symmetric boundary of the pipeline.…”

Section: Load Model and Boundary Conditionmentioning

confidence: 99%

Springback Coefficient Research of API X60 Pipe with Dent Defect

Zhang

Huang

2018

Energies

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Dent is a common form of defect on oil and gas pipeline. Some dents will undergo elastic or plastic recovery due to changes in internal pressure, also known as springback. To analyze the springback law of an API X60 pipeline with a dent defect, the secondary development technology of finite element software ABAQUS was used for parametric modeling of a dented pipeline. Using this model, the effects of various factors (wall thickness, internal pressure, indenter size, dent location, and dent depth) on the springback coefficient of a dented pipeline were analyzed. The significance of each factor was analyzed by combining an orthogonal experimental design with the Grey correlation degree. Finally, nonlinear regression analysis was used to obtain formulas for the springback coefficient as a function of the influential factors. The results show that the springback coefficient of the dented pipeline after pressurization was between 0.15 and 0.65, and the factor that had the largest effect on the springback coefficient was the dent location. The springback coefficient of the dented pipeline after de-pressurization was between 1.1 and 1.5, and the factor that had the largest effect on the springback coefficient was the internal pressure. The formulas that relate the springback coefficient and various influential factors can be used as a reference for estimating the springback of dented pipelines.

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Section: Load Model and Boundary Conditionmentioning

confidence: 99%

Springback Coefficient Research of API X60 Pipe with Dent Defect

Zhang

Huang

2018

Energies

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“…However, this model has some limitations for analyzing pipes under large lateral displacements or lateral cyclic loads. Li and Dang, 8 analyzed buried pipes by ABAQUA software and obtained strain distribution curves for pipes with different thickness to diameter ratios; Zhang et al 9 used ANSYS finite element method to simulate pipe and soil interactions for parameters such as landslide soil parameters, pipeline parameters and landslide scale were compared. The results show that there are three high stress zones in the cross section where the bending deformation of the buried pipeline is large.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of pipelines with corrosion defects under landslide

Hu,

Lu,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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As the total mileage of the pipeline and the years of operation are increasing, the threat of landslide and corrosion defects to the safety of pipeline operation is also increasing. In this paper, based on the nonlinear elastoplastic theory, a pipe-soil coupling model is established to determine the maximum stress location of the pipeline containing corrosion defects under the action of landslide, on the basis of this location, the internal pressure of pipeline operation and the factors such as landslide width and landslide displacement are analyzed. Through multivariate linear regression, the equation of the maximum stress of the pipeline with the change of landslide width and displacement is fitted. The results show that in the landslide area, the operating pressure has less influence on the safety of the pipeline and the existence of corrosion defects will lead to sudden stress changes here, which will lead to the perforation of the pipeline; with the increase of the landslide width and landslide displacement, the plastic deformation area will appear in the middle of the pipeline, which means that the pipeline in this area is prone to bending, rupture and flattening and other failures, and the safety of the pipeline has a greater risk. In the non-slippery area, the maximum stress of the pipeline will increase with the increase of operating pressure, landslide width, and landslide displacement. Through multiple linear regression, the correlation coefficients of fitting the maximum stress of the pipeline with the expressions of landslide width and displacement are 0.959 and 0.996 respectively to prove the reliability of the formula.

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“…To assess this problem, contact mechanics and nonlinearities in both material and geometry have to be considered in all phases of the dent life cycle. Recently these problems are addressed using FEA only [3,4]. Finite Element method is the most largely used method for solving problems of engineering but since it is a numerical study it does not give the total accurate understanding of the problem.…”

Section: Introductionmentioning

confidence: 99%

Stress-strain assessment of plain dents in gas pipelines

Dubyk¹,

Seliverstova

2019

Frattura Ed Integrità Strutturale

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This paper presents the analytical solution of the stress-strain state for a dented pipeline, based on the method of equivalent loads. Firstly, a solution for a harmonic imperfection was found, then using Fourier series expansion a semi-analytical procedure was proposed to assess a single dent. A comparison between analytical and numerical results for the axial force and pressure load were given. The influence of the dent dimensions, shell radius to thickness ratio and initial loading to stress concentration factor were discussed.

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Plastic damage analysis of oil and gas pipelines with unconstrained and constrained dents

Cited by 21 publications

References 11 publications

Springback Coefficient Research of API X60 Pipe with Dent Defect

Springback Coefficient Research of API X60 Pipe with Dent Defect

Failure analysis of pipelines with corrosion defects under landslide

Stress-strain assessment of plain dents in gas pipelines

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