Characteristics and life expression of fatigue fracture of G105 and S135 drill pipe steels for API grade

Luo, Sheji; Liu, Ming; Xiulin, Zheng

doi:10.1016/j.engfailanal.2020.104705

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…The tensile test was performed on a WDS-100 electronic universal testing machine (Guan Jing Electric Instrument Equipment Co., LTD, Beijing, China) with a loading rate of 0.2 mm/min and a strain rate of 10 −3 /s corresponding to sample spacing. In our previous work, we studied the uniaxial fatigue behaviors of S135 drill pipe steel in various conditions [21][22][23]. The results show that the fatigue limit of torsional fatigue compared to that of tension-compression fatigue is reduced by 31.84%.…”

Section: Methodsmentioning

confidence: 99%

“…Hence, for most cases, the fatigue failure of the drill pipe is considered to be caused by the I-III combined axial torsional loading [19,20]. In our previous work, we studied the uniaxial fatigue behaviors of S135 drill pipe steel in various conditions [21][22][23]. The results show that the fatigue limit of torsional fatigue compared to that of tension-compression fatigue is reduced by 31.84%.…”

Section: Introductionmentioning

confidence: 98%

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Fatigue and Life Prediction of S135 High-Strength Drill Pipe Steel under Tension–Torsion Multiaxial Loading

et al. 2022

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This paper investigates the fatigue behavior of S135 high-strength drill pipe steel under tension–torsion multiaxial loading. Based on the concept of critical plane during fatigue, the fatigue model under the combined loading of tension–torsion is established. The proposed model is validated, and the predicted results are in good agreement with the experimental testing results. The maximum relative errors between the estimation and the experiment are mostly within the range of factor two to three for proportional, and 90° non-proportional tension–torsion loading. Meanwhile, the failure mechanism is also discussed through fracture analysis.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Fatigue and Life Prediction of S135 High-Strength Drill Pipe Steel under Tension–Torsion Multiaxial Loading

et al. 2022

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“…As highlighted in Refs. [7][8][9][10][11], the fatigue strength of drill pipes is a widespread topic among researchers, and in Ref. [12] several factors that could trigger the initiation of cracks are highlighted, such as the stress concentration at the upset region and at the threaded connection zone and the effect of the corrosion pits.…”

Section: Introductionmentioning

confidence: 99%

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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“…Luo et al (2020) provided a modified model for the S-N data, revealing the correlation between the fatigue life and fatigue limit, equivalent stress amplitude reflecting the effect of stress ratio to predict the fatigue damage of drill-pipe. The research shows that the mechanism of the fatigue fracture was examined by scanning electron microscopy [9]. Zhang et al (2020) analyzed the chemical composition, mechanical properties and microstructures of the failed drill-pipe materials by experiments.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of Drill Pipe during Working Process in a Deep Well: A Case Study

2022

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The failure of a 101.6 mm drill pipe was studied by combining experimental testing and finite element simulation. The macro analysis, metallographic structure and energy spectrum, chemical composition and a mechanical property test of the failed drill pipe sample were firstly carried out. Then, a three-dimensional finite element model of drill pipe failure was established based on the experimental results. Finally, the failure mechanism of drill pipe was analyzed and the mitigation measures were put forward. The results showed that solids settling sticking was the direct cause of fracture failure of the drill pipe joint. Due to the violent friction and wear between the drill pipe joint and the settled sand, the large amount of heat generated caused the microstructure of the joint material to undergo phase transformation and the bearing capacity to be reduced. Finally, fracture occurs under tensile and torsional loads.

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Characteristics and life expression of fatigue fracture of G105 and S135 drill pipe steels for API grade

Cited by 10 publications

References 25 publications

Fatigue and Life Prediction of S135 High-Strength Drill Pipe Steel under Tension–Torsion Multiaxial Loading

Fatigue and Life Prediction of S135 High-Strength Drill Pipe Steel under Tension–Torsion Multiaxial Loading

Resonant Fatigue Tests on Polished Drill Pipe Specimens

Failure Analysis of Drill Pipe during Working Process in a Deep Well: A Case Study

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