Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters

Kirin, Snežana; Sedmak, Aleksandar; Zaidi, Radzeya; Grbović, Aleksandar; Šarkoćević, Živče

doi:10.1016/j.engfailanal.2020.104600

Cited by 24 publications

(9 citation statements)

References 18 publications

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“…Finite element methods were used for numerical simulations due to their simplicity, efficiency, and repeatability, as shown in [6][7][8][9][10][11][12][13][14][15][16], where Abaqus 2017 was used in similar analyses. Both elastic and plastic behaviours were defined in these models, for the parent material and weld metal, using data from Tables 1 and 3 as the input data for the simulation of specimen behaviour under tensile loads.…”

Section: Methodsmentioning

confidence: 99%

Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects

et al. 2021

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Current standards related to welded joint defects (EN ISO 5817) only consider individual cases (i.e., single defect in a welded joint). The question remains about the behaviour of a welded joint in the simultaneous presence of several different types of defects, so-called multiple defects, which is the topic of this research. The main focus is on defects most commonly encountered in practice, such as linear misalignments, undercuts, incomplete root penetration, and excess weld metal. The welding procedure used in this case was metal active gas welding, a common technique when it comes to welding low-alloy low-carbon steels, including those used for pressure equipment. Different combinations of these defects were deliberately made in welded plates and tested in a standard way on a tensile machine, along with numerical simulations using the finite element method (FEM), based on real geometries. The goal was to predict the behaviour in terms of stress concentrations caused by geometry and affected by multiple defects and material heterogeneity. Numerical and experimental results were in good agreement, but only after some modifications of numerical models. The obtained stress values in the models ranged from noticeably lower than the yield stress of the used materials to slightly higher than it, suggesting that some defect combinations resulted in plastic strain, whereas other models remained in the elastic area. The stress–strain diagram obtained for the first group (misalignment, undercut, and excess root penetration) shows significantly less plasticity. Its yield stress is very close to its ultimate tensile strength, which in turn is noticeably lower compared with the other three groups. This suggests that welded joints with misalignment and incomplete root penetration are indeed the weakest of the four groups either due to the combination of the present defects or perhaps because of an additional unseen internal defect. From the other three diagrams, it can be concluded that the test specimens show very similar behaviour with nearly identical ultimate tensile strengths and considerable plasticity. The diagrams shows the most prominent yielding, with an easily distinguishable difference between the elastic and plastic regions. The diagrams are the most similar, having the same strain of around 9% and with a less obvious yield stress limit.

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Section: Methodsmentioning

confidence: 99%

Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects

et al. 2021

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“…Few other examples of XFEM application to solve practical problems were briefly described in previous review paper of this author 39 . Rather, we focus our attention on series of papers on XFEM application published recently by Grbovic and coworkers, in the scope of the activities of the Belgrade school of XFEM simulation, 82–134 presented as case studies in the following chapters, more or less in chronological order.…”

Section: Literature Overviewmentioning

confidence: 99%

Fatigue crack growth simulation by extended finite element method: A review of case studies

Sedmak

2024

Fatigue Fract Eng Mat Struct

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Numerical simulation of fatigue crack growth (FCG) is presented, based on the application of the extended finite element method (XFEM). Couple of case studies are presented, as a review of recent experience of the Belgrade school of XFEM simulations, established at the Faculty of Mechanical Engineering. Case studies comprised Charpy specimen with initial crack at the notch tip, oil rig pipe with an axial surface crack, pressure vessels with a crack at the welded joint with connecting pipe, turbine shaft with a crack at the transition radius, optimization of a wing spar in respect to FCG, the effect of mesh size on fatigue life estimation of a stringer panel, fatigue life estimation of wing‐to‐fuselage connecting lug, geometry effect on fatigue life of orthopedic plates and fatigue life of hip implant. Based on these case studies, XFEM is discussed in respect to its accuracy and efficiency. It is concluded that XFEM is a versatile tool for simulation of FCG, providing an excellent option for precise and reliable fatigue life of a cracked component.

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“…Experimental results of prototype testing are shown in Figure 7 in the form of J integral vs. pressure, and explained in more details in [20], including comparison with FEM, indicating safe operation at the design pressure of 10 MPa. One can note that failure did not occur for testing pressure as high as 22 MPa.…”

Section: Prototype Testingmentioning

confidence: 99%

“…Nevertheless, all of them lack a comprehensive approach, which would include experimental, numerical, and analytical approaches to the problem of corroded pipes and the remaining pipe strength. Toward this aim, several papers were published in the last decade by the authors of the present study, [18][19][20][21][22], including previous experimental investigation on the pipe taken from exploitation in an oil drilling rig after 70,000 hours (8 years) of service [23,24]. In the present paper, the new method, recently introduced and applied for pressure vessels, [25][26][27][28][29], is applied to assess structural integrity of API J55 steel pipes, damaged by corrosion, using risk-based approach.…”

Section: Introductionmentioning

confidence: 99%

Corrosion effects on structural integrity and life of oil rig drill pipes

Sedmak

Zaidi

Vujicic

et al. 2022

Hem Ind

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Corrosion effects on structural integrity and life of oil rig welded pipes are analysed by experimental, analytical, and numerical methods. Experiments were performed using standard tensile specimens and CT specimens for static loading, Charpy specimens for impact loading, and 3 Point Bending specimens for fatigue crack growth with amplitude loading. In each case new and old pipes were used to evaluate corrosion effects. Results indicated negligible corrosion effects in the case of tensile properties and impact toughness, and strong effects in the case of fracture toughness and especially fatigue crack growth rates, increasing the risk of static failure and reducing significantly structural life. Analytical expressions are used for oil rig pipe structural integrity and life assessment to quantify these effects. Recently introduced risk-based approach is applied to analyse oil rig drill pipe with a corrosion defect treated as a surface crack.

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Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters

Cited by 24 publications

References 18 publications

Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects

Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects

Fatigue crack growth simulation by extended finite element method: A review of case studies

Corrosion effects on structural integrity and life of oil rig drill pipes

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