Crack propagation and burst pressure of longitudinally cracked pipelines using extended finite element method

Okodi, Allan; Lin, Meng; Yoosef-Ghodsi, Nader; Kainat, Muntaseer; Hassanien, Sherif; Adeeb, Samer

doi:10.1016/j.ijpvp.2020.104115

Cited by 35 publications

(15 citation statements)

References 13 publications

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“…To make a good calculation, the dimensions of the elements through the thickness of the wall (i.e., the path of propagation) is 0.1 mm, although the rest of the structure was meshed with coarser elements. For this study, crack propagation modelling is carried out by combining the XFEM method and cohesive segments approach [44], where this technique has been most recently employed [45,46]. This method was based on the traction separation law.…”

Section: Numerical Procedures and Resultsmentioning

confidence: 99%

Analysis of Crack Behaviour in Pipeline System Using FAD Diagram Based on Numerical Simulation under XFEM

et al. 2020

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For a long time, cracked structures have triggered various researchers to develop a structural integrity approach and design models to address the fracture problems. In the present study, a pipeline with an axial semi-elliptical surface defect was examined in detail. Recent works have highlighted the use of the classical finite element method (CFEM) as numerical tools to solve the fracture mechanics; however, this approach comes with a few difficulties in the modelling aspects. To overcome this issue, we proposed the use of the extended finite element method (XFEM), which was implemented in the commercial version of Abaqus software. Moreover, we have used the results based on this technique in the volumetric method to estimate the stress intensity factors (SIFs). Then, this parameter was employed to build the failure assessment diagram (FAD). The FAD curve was used in the current investigation because it is one of the conventional methods for the evaluation of flaws in steel pipes. The XFEM simulations enable us to draw an FAD curve that can be used as a practical reference for defect evaluation in pipeline systems in the industrial world.

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Section: Numerical Procedures and Resultsmentioning

confidence: 99%

Analysis of Crack Behaviour in Pipeline System Using FAD Diagram Based on Numerical Simulation under XFEM

et al. 2020

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“…Using this approach, the mesh conformance of crack geometry is avoided [27]. Okodi et al investigated the potential of XFEM to be used in crack propagation analysis and burst pressure prediction of pipelines [28]. It was found that XFEM can be effective in carrying out crack propagation analysis, as well as predicting pipeline burst pressure, but it was recommended that further parametric studies be done to come to a firm conclusion.…”

Section: Finite Element Methods (Fem) For Pipeline Failure Pressure P...mentioning

confidence: 99%

An Empirical Equation for Failure Pressure Prediction of High Toughness Pipeline with Interacting Corrosion Defects Subjected to Combined Loadings Based on Artificial Neural Network

2021

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Conventional pipeline corrosion assessment methods for failure pressure prediction do not account for interacting defects subjected to internal pressure and axial compressive stress. In any case, the failure pressure predictions are conservative. As such, numerical methods are required. This paper proposes an alternative to the computationally expensive numerical methods, specifically an empirical equation based on Finite Element Analysis (FEA). FEA was conducted to generate training data for an ANN after validating the method against full scale burst test results from past research. An ANN with four inputs and one output was developed. The equation was developed based on the weights and biases of an ANN model trained with failure pressure from the FEA of a high toughness pipeline for various defect spacings, defect depths, defect lengths, and axial compressive stresses. The proposed model was validated against actual burst test results for high toughness materials, with a R2 value of 0.99. Extensive parametric study was subsequently conducted to determine the effects of defect spacing, defect length, defect depth, and axial compressive stress on the failure pressure of the pipe. The results of the empirical equation are comparable to the results from numerical methods for the pipes and loadings considered in this study.

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“…They investigated the effects of the denting pressure as well as dent and crack sizes on the burst pressure and validated the predicted XFEM results with experiments [18]. Okodi et al [19] simulated the propagation of cracks in X60 grades of pipeline using the XFEM damage criterion, Maxpe, and G c and validated their results with small-scale and full-scale tests. They used proposed XFEM models to predict the burst pressure in pipes with external longitudinal rectangular cracks [19].…”

Section: Introductionmentioning

confidence: 92%

“…Okodi et al [19] simulated the propagation of cracks in X60 grades of pipeline using the XFEM damage criterion, Maxpe, and G c and validated their results with small-scale and full-scale tests. They used proposed XFEM models to predict the burst pressure in pipes with external longitudinal rectangular cracks [19]. Agbo et al [20] predicted the ductile fracture response of an X42 vintage pipe under biaxial loading using Maxpe and G c and obtained the TSC of this specific grade of pipe.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Tensile Strain Capacity for X52 Steel Pipeline Materials Using the Extended Finite Element Method

et al. 2021

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Strain-based design (SBD) plays an important role in pipeline design and assessment of pipelines subjected to geo-hazards. Under such hazards, a pipe can be subjected to substantial plastic strains, leading to tensile failure at locations of girth weld flaws. For SBD, the finite element method (FEM) can be a reliable tool to calculate the tensile strain capacity (TSC) for better design in pipelines. This study aims to investigate the ductile fracture properties for specific vintage pipeline steel (API 5L grade of X52) using the extended finite element method (XFEM). Eight full-scale tests were simulated using the commercial finite element analysis software ABAQUS Version 6.17. Maximum principal strain is used to assess the damage initiation using the cohesive zone model (CZM) when the crack evolution is evaluated by fracture energy release. A proper set of damage parameters for the X52 materials was calibrated based on the ability of the model to reproduce the experimental results. These experimental results included the tensile strain, applied load, endplate rotation, and crack mouth opening displacement (CMOD). This study describes a methodology for validation of the XFEM and the proper damage parameters required to model crack initiation and propagation in X52 grades of pipeline.

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Crack propagation and burst pressure of longitudinally cracked pipelines using extended finite element method

Cited by 35 publications

References 13 publications

Analysis of Crack Behaviour in Pipeline System Using FAD Diagram Based on Numerical Simulation under XFEM

Analysis of Crack Behaviour in Pipeline System Using FAD Diagram Based on Numerical Simulation under XFEM

An Empirical Equation for Failure Pressure Prediction of High Toughness Pipeline with Interacting Corrosion Defects Subjected to Combined Loadings Based on Artificial Neural Network

Prediction of Tensile Strain Capacity for X52 Steel Pipeline Materials Using the Extended Finite Element Method

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