Dynamics of Extended Pipeline Failure

Shtremel, M. A.; Арабей, А. Б.; Глебов, А. Г.; Аbakumov, A. I.; Есиев, Т. С.; Pyshmintsev, I. Yu.

doi:10.1134/s0036029520100249

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The second reason is that the gas pressure is inhomogeneous in the pipe cross-section, where the crack tip is located. In the upper zone (near the crack), the pressure is significantly less than in lower zone, which is diametrically distant from the crack [11]. This follows from Bernoulli's law: the pressure difference is proportional to the square of the gas velocity, and the gas escapes upward through the crack.…”

Section: Discussionmentioning

confidence: 99%

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Two types of the crack arrest during full-scale pneumatic testing of main gas pipelines

Капуткин

Arabey

2021

Lett. Mater.

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With the running fracture of the main gas pipeline, a longitudinal crack can stop propagating in one of two ways. The first way is arresting the crack without changing its direction due to the energy transferred from the expansion of the gas becomes less than the energy required to continue opening the crack. The second way is more common, when the crack changes the direction of its propagation from longitudinal to circumferential and forms a loopback. The known mathematical models describe and can predict only the first way to arrest the crack propagation, but so far they cannot simulate the second way. This paper shows that the reason for the realization of the second way is a change in the configuration ("flattening") of the cross-section of the pipe when a crack approaches. This leads to the appearance of radial normal stresses in the pipe wall. If the radial normal stresses exceed longitudinal ones, the planes of maximum tangential stresses change their positions from longitudinal to placing at an angle of 45° to the axis of the pipe. Since the metal is ductile, and the fracture results from tangential stresses, the crack changes its direction and is looped back. This situation takes place when the radius of curvature of flattening becomes less than the pipe diameter.

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Section: Discussionmentioning

confidence: 99%

“…Such tests of pipes for main gas pipelines are carried out by GAZPROM at a specially equipped test site in the Chelyabinsk Region, Russia. The order of these testes is the following [11]:…”

Section: Methodsmentioning

confidence: 99%

Two types of the crack arrest during full-scale pneumatic testing of main gas pipelines

Капуткин

Arabey

2021

Lett. Mater.

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“…Consequently, it was observed that for shorter cracks, the fracture pressure decreased with increasing the initial crack depth. In situ experimental studies of cracks and defect propagations were instead investigated by Shtremel et al [50] and Zhangabay et al [51]. Besides, a method for stopping cracks along gas pipelines by changing the configuration (flattening of the pipeline wall) of the pipe cross-section when a crack is approaching was proposed by Kaputkin and Arabey [52].…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Modeling of the Dynamic Behavior of a Crack-like Defect in an Internally Pressurized Thin-Walled Steel Cylinder

Zhangabay,

Ibraimova,

Bonopera

et al. 2024

Applied Sciences

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This article presents one part of a study on the dynamic deformation and fracture of sections of steel gas pipelines with an external crack-like defect under the action of internal pressure. This work was performed on the basis of finite-element simulations using a cylindrical shell model executed by ANSYS-19.2 on the example of the section of the steel gas pipeline “Beineu–Bozoy–Shymkent” in the Republic of Kazakhstan. The propagation of the incipient crack-like defect along the pipeline and the resulting dynamic fracture in its tip area were investigated. The options of pipeline loading by working and critical internal pressure were both considered. It was found that, within the time of 1.0 ms, the formed crack expanded in the circumferential direction up to the maximum value, which depended on the value of the internal pressure. A further growth of cracks occurred along the longitudinal direction. At the operating pressure, the initial length of the crack increased by a factor of 5.6, while the equivalent stresses increased by a factor of 1.53 within 3.5 ms. Within the time of 3.75 ms, the equivalent stresses stopped growing due to the gas decompression. Specifically, there was a stop to the crack growth along the longitudinal direction. Vice versa, at the maximum pressure, the pipeline fracture did not change qualitatively, while at the time of the process, it decreased up to 3.5 ms. The finite-element results of the stress–strain state and pipeline fracture in the crack tip area at the working pressure showed that, within the time of 1.0 ms, the distance between the crack walls reached 23 mm at the free edge. Conversely, within the time periods of 2.25 and 3.5 ms, it increased two and three times, respectively. The crack elongation in the longitudinal direction occurred 5.8 times with time. Together, within the time of 3.5 ms, the equivalent stresses increased twice, after which the growth of the crack stopped due to the gas decompression. Moreover, studies on the growth of the crack-like defect in its tip area at the maximum pressure showed that additional considerations on the pressure on the crack edges led to an increment of 3.6% of the crack length. The results of this work can be used for the development of measurements for operating gas pipelines in the field of structural reinforcement.

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Influence of crystallographic texture of TMCP pipe steel on the nature of deformation and fracture during tensile testing

Данилов

Хотинов

Urtsev³

et al. 2022

Procedia Structural Integrity

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Dynamics of Extended Pipeline Failure

Cited by 6 publications

References 3 publications

Two types of the crack arrest during full-scale pneumatic testing of main gas pipelines

Two types of the crack arrest during full-scale pneumatic testing of main gas pipelines

Finite-Element Modeling of the Dynamic Behavior of a Crack-like Defect in an Internally Pressurized Thin-Walled Steel Cylinder

Influence of crystallographic texture of TMCP pipe steel on the nature of deformation and fracture during tensile testing

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