Comparative study of the growth of single-crack and double-crack samples under tensile fatigue loads

Liu, Dejun; Tian, Gan; Yang, Zhengwei; Jin, Guofeng

doi:10.1007/s00419-021-01986-2

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…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. 27 Consequently, crack depth is considered in this paper.…”

Section: Single Crack Propagation Modelmentioning

confidence: 99%

“…12 However, in the same pipeline or between adjacent pipelines, there is always the interaction between cracks, which increases the driving force of crack propagation and the crack propagation rate. 20 In previous studies, such dependencies were modeled using implicit methods. Copula functions or multivariate random processes have been used to describe the degradation dependency between multiple cracks.…”

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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Section: Single Crack Propagation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Paris law can reflect crack stable growth rates which was confirmed in [43]. However, for considering the effects of multiparameters, NASGRO formula, evolved from the Paris law, has been used to simulate the crack growth [43,44]: Step 25…”

Section: Crack Bifurcation Simulationmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of the 2195-T8 Aluminum-Lithium Alloy with a Precorroded Hole

Liu

Tian

et al. 2022

International Journal of Aerospace Engineering

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This work investigated the fatigue crack propagation behavior of the 2195-T8 Al-Li alloy with precorroded holes. The microstructure, crack growth path, and the fracture surfaces of the samples with the precorroded holes have been examined with scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and computed tomography (CT). The characteristics of the crack growth have been analyzed via fracture mechanics by employing the finite element method (FEM). The results showed that the bulk of the fatigue cracks had been initiated from the corrosion pits and corroded discontinuously and precipitated further to become intergranular. Owing to the superposed stress concentration caused by the corrosion pits, the porous region at the bottom of the precorroded hole had affected the crack propagation performance. Crack growth rates were different in multiple positions owing to the difference of K I at crack fronts.

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Experimental study on the interaction mechanism of two dynamic cracks under blasting loading

Peng,

Yue,

Wang

et al. 2024

International Journal of Rock Mechanics and Mining Sciences

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Comparative study of the growth of single-crack and double-crack samples under tensile fatigue loads

Cited by 5 publications

References 12 publications

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

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

Fatigue Crack Propagation Behavior of the 2195-T8 Aluminum-Lithium Alloy with a Precorroded Hole

Experimental study on the interaction mechanism of two dynamic cracks under blasting loading

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