Mechanical Properties and Component Behaviour of X80 Helical Seam Welded Large Diameter Pipes

Knoop, Franz Martin; Flaxa, Volker; Zimmermann, Steffen; Groß-Weege, Johannes

doi:10.1115/ipc2010-31602

Cited by 4 publications

(4 citation statements)

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“…For carbon steels, the Zhu-Leis flow solution of burst pressure agrees well with the test data on average [6,12]. Many other investigators [13][14][15][16] also validated the Zhu-Leis solution using different full-scale burst pressure data for a wide range of pipeline steels, including steel grades from Grade A to X120. All validations demonstrated that the Zhu-Leis solution is the best burst pressure prediction for thin-wall line pipes.…”

Section: Introductionsupporting

confidence: 61%

New Strength Theory and Its Application to Determine Burst Pressure of Thick-Wall Pressure Vessels

Zhu¹,

WIERSMA²,

Sindelar³

et al. 2022

Volume 4B: Materials and Fabrication

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The classical Tresca and von Mises strength theories have been utilized extensively for pressure vessel and pipeline design. For pressure vessel design, ASME B&PV code was developed using both Tresca and von Mises strength theories, where the yield strength (YS) was used for an elastic design and the ultimate tensile strength (UTS) was used for an elastic-plastic design. For pipeline design, ASME B31.3, B31G, or other codes were developed using the Tresca strength theory coupled with the YS or a flow stress. The flow stress was introduced to reduce over conservatism from the YS and avoid overestimation from the UTS for many steels. It has been widely accepted that the burst strength of pipelines depends on the UTS and strain hardening rate, n, of the ductile steel. The average shear stress yield theory was thus developed, and the associated burst pressure solution was obtained as a function of UTS and n. Experiments showed that the Zhu-Leis solution provides a reliable prediction of the burst pressure for defect-free thin-wall pipes. In order to extend the Zhu-Leis solution to thick-wall pressure vessels, this work modified the traditional strength theories and obtained new burst pressure solutions for thick-wall pressure vessels. Three new flow stresses were proposed to describe the tensile strength and plastic flow response for a strain hardening material. The associated strength theories were then developed in terms of the Tresca, von Mises and Zhu-Leis yield criteria. From these new strength theories, three burst pressure solutions were obtained for thick-wall cylinders, where the von Mises solution is an upper bound prediction, Tresca solution is a lower bound prediction, and the Zhu-Leis solution is an averaged prediction of burst pressure for thick-wall vessels. Subsequently, the proposed burst solutions were validated by a large dataset of full-scale burst tests.

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Section: Introductionsupporting

confidence: 61%

New Strength Theory and Its Application to Determine Burst Pressure of Thick-Wall Pressure Vessels

Zhu¹,

WIERSMA²,

Sindelar³

et al. 2022

Volume 4B: Materials and Fabrication

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show abstract

“…For carbon steels, the Zhu-Leis solution predicts a burst pressure result that is close to the average of the von Mises and Tresca solutions, and thus matches well with the averaged test data [8]. Since the Zhu-Leis solution was published, many researchers [9][10][11][12] have used and validated it using different fullscale burst data for pipeline steels and concluded that the Zhu-Leis solution is the best prediction of burst pressure for thin-wall line pipes. This conclusion was further confirmed by Zhu and Leis [13] through comparison with test data from more than 100 full-scale burst tests for pipeline grades ranging from Grade B to X120, and by Zhou and Huang [14] through a model error assessment of existing burst models using another full-scale test database for line pipes.…”

Section: Introductionsupporting

confidence: 52%

Machine Learning Models of Burst Strength for Defect-Free Pipelines

Zhu

Johnson

Sindelar

et al. 2022

Volume 4B: Materials and Fabrication

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Burst strength of line pipes is essential to pipeline design and integrity management. The simple Barlow equation with the ultimate tensile strength (UTS) was often used to estimate burst strength of line pipes. To consider the plastic flow effect of ductile steels, Zhu and Leis (2006, IJPVP) developed an average shear stress yield criterion and obtained the Zhu-Leis solution of burst strength for defect-free pipelines in term of UTS and strain hardening exponent, n, of materials. The Zhu-Leis solution was validated by more than 100 burst tests for various pipeline steels. The Zhu-Leis solution, when normalized by the Barlow strength, is a function of strain hardening rate, n, only, while the experimentally measured burst strength, when normalized by the Barlow strength, is a strong function of n and a weak function of UTS and pipe diameter to thickness ratio D/t. Due to difficulty of three-parameter regressions, this paper adopts the machine learning technology to develop alternative models of burst strength based on a large database of full-scale burst tests. In comparing to the regression, the machine learning method works well for both single and multiple parameters by introducing an artificial neural network (ANN), activation functions and learning algorithm for the network to learn and make predictions. Three ANN models were developed for predicting the burst strength of defect-free pipelines. Model 1 has one input variable and one hidden layer with three neurons; Model 2 has three input variables and one hidden layer with five neurons; and Model 3 has three input variables and two hidden layers with three neurons for the first hidden layer and two neurons for the second hidden layer. Those ANN models were then validated by the full-scale test data and evaluated through comparison with the Zhu-Leis solution and the linear regression result. On this basis, the best ANN model is recommended.

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“…Recent developments in steel coil production facilities have enabled the possibility to manufacture spiral welded pipes with sufficient wall thickness and of adequate steel grade quality (strength and toughness properties) [2][3][4]. Based on the work of several research groups it can be concluded that in comparison to UOE-pipes, spiral pipes can perform equal or better when considering the following elements: cold field bending [5], buckling resistance [6], fracture arrest [7,8], ductile tearing [9], plastic collapse [10], bending [11], and burst fracture tests [12]. However, the evaluation of spiral pipe performance and its applicability in a tensile strain-based design context has received little attention [13].…”

Section: Introductionmentioning

confidence: 99%

Effects of specimen geometry and anisotropic material response on the tensile strain capacity of flawed spiral welded pipes

Minnebruggen

Hertelé

Thibaux

2015

Engineering Fracture Mechanics

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Mechanical Properties and Component Behaviour of X80 Helical Seam Welded Large Diameter Pipes

Cited by 4 publications

References 0 publications

New Strength Theory and Its Application to Determine Burst Pressure of Thick-Wall Pressure Vessels

New Strength Theory and Its Application to Determine Burst Pressure of Thick-Wall Pressure Vessels

Machine Learning Models of Burst Strength for Defect-Free Pipelines

Effects of specimen geometry and anisotropic material response on the tensile strain capacity of flawed spiral welded pipes

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