Numerical and experimental distribution of temperature and stress fields in API round threaded connection

Yuan, Guangyin; Yao, Zhenqiang; Wang, Qinghua; Zhentong, Tang

doi:10.1016/j.engfailanal.2005.11.006

Cited by 44 publications

(15 citation statements)

References 3 publications

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“…Meng et al [93] had performed numerous experiments and tried to validate the anti-friction, anti-wear and antigalling characteristics of NPAF coating, during which the NPAF coating material was prepared about 6 g of PTFE particles of diameter 591 nm and 15 g of Polyacrylic acid resin and then applied on manufactured buttress thread couplers and then tested for make-up torque as make-up torque is the function of the probability of galling in which higher the magnitude of make-up torque, the higher is the contingency of thread galling [30,91,[94][95][96][97][98][99]. After scrutinizing the data obtained by the after-experiment, they reported that there was a significant drop in the magnitude of make-up torque from 19,426 to 145,638 Nm i.e.…”

Section: Polytetrafluoroethylene (Ptfe)mentioning

confidence: 99%

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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Galling is the surface phenomenon which involves adhesion of local contact points and creation of protrusions on the juxtaposition of surfaces owing to high friction, inappropriate tribological loading, starved lubrication and high contact pressure (~ 1000 kPa). All these factors result in severe plastic deformation varying from 8000 to 10,000 µε (ε-strain) and diffusion of materials into one another, which consequently results in fatigue wear, surface roughness, tribocorrosion and seizing up of critical parts. The aim of the review is to analyze and summarizes the issue of galling, concurrently it also deals with the novel and economical mitigation method i.e. use of fluorine based coatings e.g. PTFE, owing to their lowest friction coefficient from 0.02 to 0.2 among other solids, high stiffness, high thermal stability and non-adherent characteristics that augments the mechanical and tribological properties and concurrently protect against hostile environments that eventually upsurges the life of components.

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Section: Polytetrafluoroethylene (Ptfe)mentioning

confidence: 99%

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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“…2 The use of IR monitoring combined with threaded connections has not been frequently performed yet. The only documented study containing this approach is conducted during make-up 13 where the temperature increase is initiated by the frictional energy. However, the resolution of the area of interest is considered too low to make actual claims about the mechanisms responsible for this heat production.…”

Section: Experimental Setup and Instrumentationmentioning

confidence: 99%

Evaluation of a numerical model for tapered threaded connections subjected to combined loading using enhanced experimental measurement techniques

Galle

Waele

Wittenberghe

et al. 2015

The Journal of Strain Analysis for Engineering Design

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Threaded connections used in the oil and gas industry have to withstand ever increasing axial and pressure loads. The structural behavior of these joints can be predicted by using numerical models, provided these are soundly validated. Within this paper, a finite element model of tapered, shoulderless connections containing a trapezoidal thread type is experimentally validated conducting a test load envelope experiment (TLE) and a tensile failure test. The evaluation is performed using both conventional and advanced measurement techniques. Surface strains are validated by comparing DIC and strain gage results with the numerical output. An almost perfect quantitative match between the numerically predicted axial strains and the experimentally measured strain gage data is obtained. In addition, a qualitative match can also be observed when considering the axial strains obtained by Digital Image Correlation (DIC). Furthermore, infrared thermography measurements are compared to the numerical deformation energy, assuming that temperature is an additional, but indirect parameter to evaluate the validity of the model. From the results, the proposed model has proven to be reliable when a combination of axial tension and internal pressure is applied. While the model is originally designed to predict the connection’s structural behavior for loads up to the yield strength, it is possible to estimate this behavior for higher loads by modifying the contact area

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“…As is common practice when modeling threaded couplings [11][12][13], a 2D axisymmetric finite element model is used. This has the advantage of a drastically reduced calculation time as compared to full 3D models.…”

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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Numerical and experimental distribution of temperature and stress fields in API round threaded connection

Cited by 44 publications

References 3 publications

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

Evaluation of a numerical model for tapered threaded connections subjected to combined loading using enhanced experimental measurement techniques

Experimental determination of the fatigue life of modified threaded pipe couplings

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