Fatigue failure analysis of dented pipeline and simulation calculation

Luo, Jun; Zhang, Yani; Li, Lifeng; Zhu, Lixia; Wu, Gang

doi:10.1016/j.engfailanal.2020.104572

Cited by 25 publications

(6 citation statements)

References 22 publications

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“…It requires a large amount of memory, and the convergence speed is also insufficient. Although the nonsequential simulation algorithm has been improved, its model establishment is relatively simple, the memory required for the operation is small, and the relative sequential convergence speed is relatively fast, but it still cannot meet the requirements in practical application [13,14].…”

Section: Reliability Evaluation Methods Of Relay Protectionmentioning

confidence: 99%

Automatic Calculation and Simulation of Time-Varying Failure Rate of Digital Relay Protection Device

Yang¹

2022

Mathematical Problems in Engineering

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Efficiency is an important indicator of risk assessment, but the failure rate changes with time, which makes risk assessment very difficult. Traditional methods often only measure the steady-state and static indicators of relay protection. The traditional method often only measures the steady-state and static indicators of the relay protection, or directly uses the RiskWeibull analysis system to perform reliability analysis on the relevant data. However, this method can only perform quantitative static analysis on the data. Once the system is disturbed, its reliability will be affected. Analysis is not possible. Since the relay protection device has the possibility of malfunction and refusal at the same time, in order to distinguish, the risk is introduced into the reliability evaluation of the relay protection device to achieve the purpose of considering the possibility and consequences of its failure at the same time. Based on the traditional method, this paper proposes a method to calculate the time-varying failure rate of the relay protection device by using the support vector machine model, which improves the influence of hidden risks on the power grid relay protection, and not only realizes the scientific hidden danger evaluation, risk rating. It is of great significance for the development of power grids to evaluate the consequences of failures and to make the transmission lines operate safely and stably.

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Section: Reliability Evaluation Methods Of Relay Protectionmentioning

confidence: 99%

Automatic Calculation and Simulation of Time-Varying Failure Rate of Digital Relay Protection Device

Yang¹

2022

Mathematical Problems in Engineering

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“…Thus, an experimental verification process or detailed analysis method 2 of 23 is required to guarantee the integrity of pipeline components under fatigue loading. In addition, the high stress and strain in the damaged areas of a pipeline affect the fatigue strength and cause low-pressure failure [9,10]. Fluctuating pressures that can cause fatigue or the effects of corrosion can also cause long-term problems [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Fatigue Crack Growth Prediction for Pipelines with Initial Flaws

Choi,

Lee

2024

Buildings

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This paper presents a probabilistic method to predict fatigue crack growth for surface flaws in pipelines using a particle filtering method based on Bayes theorem. The random response of the fatigue behavior is updated continuously as measured data are accumulated by the particle filtering method. Fatigue crack growth is then predicted through an iterative process in which particles with a high probability are reproduced more during the update process, and particles with a lower probability are removed through a resampling procedure. The effectiveness of the particle filtering method was confirmed by controlling the depth and length direction of the cracks in the pipeline and predicting crack growth in one- and two-dimensional cases. In addition, the fatigue crack growth and remaining service life with a 90% confidence interval were predicted based on the findings of previous studies, and the relationship between the fatigue crack growth rate and the crack size was explained through the Paris’ law, which represents fatigue crack growth. Finally, the applicability of the particle filtering method under different diameters, aspect ratios, and materials was investigated by considering the negative correlation between the Paris’ law parameters.

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“…Results showed that the initial crack sizes, stress ratios, and multiple crack interactions affected fatigue crack propagation. Luo et al [6] used finite element analysis to study the deformation and stress of pipelines under various loads. Their simulation showed how microcracks gradually propagate under alternating stress, leading to leakage through the pipeline wall thickness.…”

Section: Introductionmentioning

confidence: 99%

Phase field modelling of elastic-plastic fatigue fracture of oil and gas pipeline

Wang,

He,

et al. 2024

Mater. Res. Express

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This paper established a fatigue fracture phase-field model (PFM) to evaluate fatigue damage evolution and crack propagation in oil and gas pipeline. To address inaccuracies in damage evolution, a threshold of the elastic-plastic fracture energy was introduced in the proposed PFM. Using the finite element method, the PFM was applied to simulate fatigue crack growth. Results from compact tension (CT) specimen of the X56 gas pipeline steel demonstrated that the da/dN-ΔK curve from the current PFM, accounting for plasticity, aligned more closely with experimental results than the elastic PFM. The fatigue crack propagation and fatigue life of the X80 gas pipeline with different defects of the same depth were also analyzed. The results indicated that triangular defects significantly impacted the fatigue life of the X80 gas pipeline. Finally, a model of X60 pipeline with various initial defects was developed to validate the effectiveness of the proposed PFM for full-scale pipeline fatigue fracture by comparing it to experimental a-N curves. The simulation results indicated that the distance and angle between two initial defects in the pipeline significantly influenced the propagation of fatigue cracks and the pipeline's service life. These findings of this paper can serve as a reference for estimating the service life of gas and oil pipelines.

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Fatigue failure analysis of dented pipeline and simulation calculation

Cited by 25 publications

References 22 publications

Automatic Calculation and Simulation of Time-Varying Failure Rate of Digital Relay Protection Device

Automatic Calculation and Simulation of Time-Varying Failure Rate of Digital Relay Protection Device

Probabilistic Fatigue Crack Growth Prediction for Pipelines with Initial Flaws

Phase field modelling of elastic-plastic fatigue fracture of oil and gas pipeline

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