Prediction of Corrosive Fatigue Life of Submarine Pipelines of API 5L X56 Steel Materials

Gao, Xudong; Shao, Yongbo; Xie, Liyuan; Wang, Yamin; Yang, Dejun

doi:10.3390/ma12071031

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…where a represents the crack length, N is the number of cyclic loads, K = K max − K min is the amplitude of the stress intensity factor, C and m are constants. The Paris' law had been mainly used in the metal fields [59][60][61][62][63]. Some bending experiments of notched concrete beams [64,65] were carried out to investigate the parameters in Paris' law applicable to plain concrete.…”

Section: The Modified Paris' Law For Concretementioning

confidence: 99%

Analytical Models of Concrete Fatigue: A State-of-the-Art Review

Wei¹,

Makhloof²,

Ren³

2023

Computer Modeling in Engineering &Amp; Sciences

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Fatigue failure phenomena of the concrete structures under long-term low amplitude loading have attracted more attention. Some structures, such as wind power towers, offshore platforms, and high-speed railways, may resist millions of cycles loading during their intended lives. Over the past century, analytical methods for concrete fatigue are emerging. It is concluded that models for the concrete fatigue calculation can fall into four categories: the empirical model relying on fatigue tests, fatigue crack growth model in fracture mechanics, fatigue damage evolution model based on damage mechanics and advanced machine learning model. In this paper, a detailed review of fatigue computing methodology for concrete is presented, and the characteristics of different types of fatigue models have been stated and discussed.

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Section: The Modified Paris' Law For Concretementioning

confidence: 99%

Analytical Models of Concrete Fatigue: A State-of-the-Art Review

Wei¹,

Makhloof²,

Ren³

2023

Computer Modeling in Engineering &Amp; Sciences

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“…Finally it penetrates the pipeline wall. 18 However, the interaction of multiple cracks can eventually lead to equal crack lengths in both the length and depth directions. 20 Compared with the crack length, a change in the crack depth is the main factor affecting the reliability of a multi-crack pipeline.…”

Section: Single Crack Propagation Modelmentioning

confidence: 99%

“…12,17 Statistical data show that pipeline cracks are one of the main reasons for pipeline corrosion-based leakage. 18 Due to the randomness of crack initiation and propagation, previous research has used homogeneous 12 or non-homogeneous 4 Poisson processes to model the initiation of new cracks, and monotonically increasing random processes such as Gamma 4 or Inverse Gaussian (IG) 19 processes to characterize the cracks propagation. Moreover, Multiple-crack propagation processes have been assumed to be independent of each other.…”

Section: Introductionmentioning

confidence: 99%

“…24,25 Some studies have established a pipeline reliability model based on the initiation and propagation mechanism of pipeline defects with the help of Paris’ law, finite element analysis, and the limit state equation. 18,26 However, using the mechanism model to predict pipeline reliability has several limitations: On the one hand, the mechanism model needs to understand the complex mechanism of pipeline defects, material parameters, and the surrounding environmental characteristics. It also has the disadvantage of being inconvenient to use.…”

Section: Introductionmentioning

confidence: 99%

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Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Zheng,

Dong,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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Cracks due to corrosion are one of the main reasons for natural-gas pipeline leaks. Making the reliability assessment, prediction, and maintenance decision of pipelines based on measurable crack data is a central issue at present. The failure of pipelines is usually a result of the cumulative impact of multiple cracks. The interaction between adjacent cracks accelerates crack propagation, and greatly affects the degradation mechanism of pipelines. In this study, the reliability prediction and maintenance decisions were studied by considering the dependent degradation between multiple cracks in pipelines. Firstly, the initiation and propagation of pipeline cracks were modeled using a non-homogeneous Poisson process and a Gamma process, respectively. The interaction between cracks was defined to be a function of the random crack distance, which could be reflected by the change of shape parameters in the Gamma process. Secondly, the pipeline’s failure was defined as the competitive failure of the number of cracks, the maximum crack depth, and the total crack depth. The reliability prediction model of a pipeline under this failure mode was determined. A non-periodic combined maintenance policy considering both the pipeline condition and its predictive reliability was then proposed, and an optimal predictive maintenance decision model was constructed to minimize the long-term average cost rate. Finally, the effectiveness of the proposed model and policy was verified by a numerical experiment and a crack dataset of a transnational pipeline.

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“…The later, assuming an existing crack in the structure initiated from manufacturing processes, employs fracture mechanics and crack growth methods to predict the rate of the crack growth under cyclic loadings. However, regarding that the fracture mechanics method takes relatively real assumptions and is able to realistically predict the fatigue life, this method is used here to determine the fatigue life of the TS structure (Wiesner et al, 2000, Gao et al, 2019, Wan et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

The Crack Resolution Required to Ensure Fatigue Life of a Rescue Submarine’s Transfer Skirt

Gandomkar

Moshref-Javadi

2022

IJME

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Transfer skirt (TS) is a structure with spherical asymmetric sectors, which is connected to a rescue submarine and used to transfer crew between two submarines in the depth of the sea. When this structure is connected to the disabled submarine in deep, it is under violent stresses that when repeated, cause fatigue damage at sensitive regions such as welded joints. In this article, based on the Paris crack growth equation and fracture mechanics criteria in BS 7910 standard, a code is developed, by which the fatigue life of the transfer skirt structure containing various initial crack sizes is evaluated. Stress analysis is performed in order to acquire the stress distribution and to determine the stress concentration spots at the welded joints. At last, regarding the relationship between crack length and prospected life under various conditions, the minimum resolution required for examination instruments to identify defects in the welds is resolved. It seems that a permissible size of an initial crack in the welds of a transfer skirt enduring 50000 fatigue cycles is the utmost 0.65mm.

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Prediction of Corrosive Fatigue Life of Submarine Pipelines of API 5L X56 Steel Materials

Cited by 13 publications

References 34 publications

Analytical Models of Concrete Fatigue: A State-of-the-Art Review

Analytical Models of Concrete Fatigue: A State-of-the-Art Review

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

The Crack Resolution Required to Ensure Fatigue Life of a Rescue Submarine’s Transfer Skirt

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