Fatigue resonant tests on S140 and S150 grade corroded drill pipe connections and pipe bodies

Santus, Ciro; Burchianti, A.; Inoue, Tomoya; Ishiguro, Hitoshi

doi:10.1016/j.ijpvp.2020.104107

Cited by 14 publications

(14 citation statements)

References 35 publications

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“…The fatigue test results of the polished pipe specimens in terms of stress amplitude and number of cycles to failure are reported in Figure 8, along with those of our previous research [50] for a direct comparison. Pipe specimen 1 failed after N f = 134,300 cycles and at a stress amplitude σ a = 260 MPa, while pipe specimen 2 failed after N f = 162,600 cycles and at a stress amplitude σ a = 268 MPa.…”

Section: Fatigue Strength Results and Crack Location Analysesmentioning

confidence: 99%

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Resonant Fatigue Tests on Polished Drill Pipe Specimens

Santus,

Romanelli,

Bertini

et al. 2024

Machines

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In this study, the fatigue strength of polished drill pipe specimens was investigated and compared with previous test results of corroded and not-corroded pipes. The resonant fatigue test rig, which was designed and implemented by the University of Pisa, is initially presented by providing a detailed description of the set-up of the machine, the calibration of the strain gauges, the control system, and the correct identification of the vibrational node locations. A polishing rig was also designed and put into operation to remove the corrosion pits from the outer surface of almost the entire length of the drill pipe specimens. After the fatigue tests with the resonant rig, and the observation of the fatigue fracture of the specimens, a few samples were extracted from different zones (corroded and not corroded) of the failed drill pipe specimens. This allowed for investigations to be carried out using a scanning electronic microscope. The obtained results were analyzed using the Murakami model, and a discussion is presented about the effect of the corrosion pits on the fatigue strength.

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Section: Fatigue Strength Results and Crack Location Analysesmentioning

confidence: 99%

“…The resonant fatigue test rig for long tubular structures was utilized by the authors of this research in previous studies, as in Refs. [50,51], and in subsequent years, some changes were proposed to improve the performance of the tests. This test rig is similar to other testing machines, as shown in Refs.…”

Section: Introductionmentioning

confidence: 99%

Resonant Fatigue Tests on Polished Drill Pipe Specimens

Santus,

Romanelli,

Bertini

et al. 2024

Machines

View full text Add to dashboard Cite

show abstract

“…From the beginning of the introduction, the advantages of seamless pipe (i.e., increased pressure ratings, uniformity of shape, and structural strength and fatigue under load) were highlighted. Especially, uniformity of geometry and material properties of the seamless pipe may help to reduce the possibility of stress concentration, initial deflection, and welding-induced residual stress [54] which can lead age-related structural damage [55], such as fatigue cracking and its propagation, localized dents [56], corrosion [57,58], and combined corrosion-fatigue [59,60] or corrosion stress and deformation issues [61,62]. In particular, seamless pipe is used for the drilling, rigid-production riser, and small size piping systems by considering fatigue and structural capacities subjected to various types of environmental loadings.…”

Section: Resultsmentioning

confidence: 99%

A Useful Manufacturing Guide for Rotary Piercing Seamless Pipe by ALE Method

Topa

Cerik

Kim

2020

JMSE

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The development of numerical simulations is potentially useful in predicting the most suitable manufacturing processes and ultimately improving product quality. Seamless pipes are manufactured by a rotary piercing process in which round billets (workpiece) are fed between two rolls and pierced by a stationary plug. During this process, the material undergoes severe deformation which renders it impractical to be modelled and analysed with conventional finite element methods. In this paper, three-dimensional numerical simulations of the piercing process are performed with an arbitrary Lagrangian–Eulerian (ALE) formulation in LS-DYNA software. Details about the material model as well as the elements’ formulations are elaborated here, and mesh sensitivity analysis was performed. The results of the numerical simulations are in good agreement with experimental data found in the literature and the validity of the analysis method is confirmed. The effects of varying workpiece velocity, process temperature, and wall thickness on the maximum stress levels of the product material/pipes are investigated by performing simulations of sixty scenarios. Three-dimensional surface plots are generated which can be utilized to predict the maximum stress value at any given combination of the three parameters.

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“…It was found by examining DPs used in real situations that die marks appear on the outer surface of the DP (shown in Fig. 1(b)), which may cause necking or even fractures leading to DP failures (Lu et al, 2005;Moradi and Ranjbar, 2009;Albdiry and Almensory, 2016;Damjanović et al, 2019;Santus et al, 2020). A DP failure not only creates significant safety hazards, but also reduces the drilling efficiency and consequently increases the drilling costs (Liu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%