Numerical and experimental study of the fatigue of threaded pipe couplings

Wittenberghe, Jeroen Van; Baets, Patrick De; Waele, Wim De; Autrève, Stijn Van

doi:10.2495/secm090151

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…In the paper (Kopei et al, 2019), it is proposed to simulate tapered threads in the FreeCAD environment using programming in Pithon. Modern CADs provide an opportunity to analyze the stress distribution between the surfaces of the box and the pin in conjunction (Wittenberghe et al, 2009) and (Wang et al, 2016). These studies confirm that the first and last turns of the subject are the most exposed.…”

Section: Previous Analytical Author Researches About Influence Of Inamentioning

confidence: 99%

Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

Onysko

Kopei

Medvid

et al. 2019

New Trends in Production Engineering

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The drill string consists of connected drill pipes and other elements. The connection is carried out by screwing of the drill string elements with the help of tool-joint tapered thread. The operational characteristics of the drill pipes depend of the manufacture precision of these tool-joints mostly. The accuracy of the thread is regulated by the accuracy of its profile and the accuracy of its pitch diameter value. The accuracy of the tapered thread manufacturing on the lathe in its depending on the values of the geometric parameters of the lathe tool and the values of deviations of its installation relatively to the workpiece axis is investigated. It is proved that for the tapered thread of form VI profile used for connection of drill pipes with the diameter from 30 mm to 44 mm the most influential factor, in relation to the accuracy of the thread profile is the value of the rake angle. Application of the rake angle value up to −5° according to the research data leads to a deviation from the specified profile of 0.3°, which is more than 35% of the declared standard tolerance on deviations from the profile. Also, the influence of the back rake angle value on the value of the deviation from the standard pitch diameter of the thread is proved. It is proved that the magnitude of the tangential displacement of the nose of the cutter relatively to the axis of the thread up to −0.2 mm can cause a deviation of the profile angle of 0.18°, which is 27% of the standard tolerance.

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Section: Previous Analytical Author Researches About Influence Of Inamentioning

confidence: 99%

Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

Onysko

Kopei

Medvid

et al. 2019

New Trends in Production Engineering

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show abstract

“…This resulted in a multi-linear elastic-plastic material model with kinematic hardening. The coefficient of friction between the pin and box threads was determined to be 0.12 [16].…”

Section: Finite Element Modelmentioning

confidence: 99%

Experimental determination of the fatigue life of modified threaded pipe couplings

Wittenberghe

Pauw

Baets

et al. 2010

Procedia Engineering

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To assemble tubular structures such as pipelines, risers,… , threaded couplings can be used. In service these couplings are often subjected to dynamic loads, and to maintain a secure connection, they are generally preloaded. The combination of preload and external dynamic loads results in a multiaxial stress distribution over the connection, where the coupling's threads act as stress raisers, initiating fatigue cracks. In this study the fatigue life of the standard API Line Pipe coupling and two modified coupling configurations is determined experimentally. This way the influence of the coupling's global geometry on the connection's fatigue life is studied. Threaded pipe samples with a nominal size of 1" are tested on a four-point bending fatigue test setup to obtain S-N curves. Both modified coupling configurations exhibit a fatigue life improvement. In the final part of this paper, these experimental observations are explained by a combination of a damage evolution law and a finite element model. NomenclatureA damage parameter S m mean stress [MPa] D damage parameter [-] S r stress range [MPa] E Young's modulus [MPa] STD standard deviation F force [N] damage parameter [-] N number of cycles [-] eq equivalent von Mises stress [MPa] N f number of cycles to failure H hydrostatic pressure [MPa] R load ratio [-] y yield stress [MPa] 2 J. V. Wittenberghe et al./ Procedia Engineering 00 (2010) 000-000 R V triaxiality function [-] UTS ultimate tensile stress [MPa] S a stress amplitude [MPa] Poisson's ratio [-] S f fatigue stress [MPa]

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“…Yu Wang et al [14] studied the stress distribution in the joint threaded by analyzing under axial tension and optimized the threaded structure of the joint. Wittenberghe et al [23] used fnite element analyses of conical threaded API line pipe couplings to quantify the infuence of their contact parameters (coefcient of friction, preload, and taper angle).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Shu

Zhao

Mei

et al. 2023

Mathematical Problems in Engineering

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With the wide application of directional drilling technology in coal mine predraining boreholes, the failure problem of the tool joint of the directional drill pipe has become one of the main factors restricting the drilling efficiency. The main reason for the failure problem of the tool joint of the directional drill pipe is the stress concentration. The stress test rig for the tool joint of the directional drill pipe is designed based on the resistance strain measurement method, and the stress of the tool joint of the directional drill pipe is tested. The tool joint’s 3D finite element model was established based on nonlinear contact theory. The experiment verified the accuracy of this model. The stress distribution of the tool joint of the directional drill pipe was obtained. The research shows that the stress of the tool joint of the directional drill pipe is concentrated at the root between the third and the fourth turn of the engaged thread. The work presented in this study is a reliable guide to the design and field use of the tool joint of the directional drill pipe.

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Numerical and experimental study of the fatigue of threaded pipe couplings

Cited by 6 publications

References 9 publications

Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

Experimental determination of the fatigue life of modified threaded pipe couplings

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

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