Modeling and application of discontinuous slow crack growth behaviors of high-density polyethylene pipe with various geometries and loading conditions

Wee, Jung-Wook; Park, Sang Youn; Choi, Byoung Ho

doi:10.1016/j.engfracmech.2020.107205

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…Equation ( 46 ) describes the lifetime along the first interval only (this interval corresponds to ductile failure of semicrystalline polymers). The other intervals are associated with quasibrittle failure driven by the slow growth of microcracks [ 51 , 52 , 53 ], and brittle failure caused by aging and chemical degradation [ 24 , 54 , 55 ]. Although the proposed model does not predict the lifetime of HDPE at the stages of semibrittle and brittle fracture, it improves predictions at the stage of ductile failure, and allows for the knee point corresponding to the transition from ductile to quasibrittle failure to be evaluated correctly.…”

Section: Resultsmentioning

confidence: 99%

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

2023

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Observations are reported in uniaxial tensile tests with various strain rates, tensile relaxation tests with various strains, and tensile creep tests with various stresses on high-density polyethylene (HDPE) at room temperature. Constitutive equations are developed for the viscoelastoplastic response of semicrystalline polymers. The model involves seven material parameters. Four of them are found by fitting observations in relaxation tests, while the others are determined by matching experimental creep curves. The predictive ability of the model is confirmed by comparing observations in independent short- and medium-term creep tests (with the duration up to several days) with the results of numerical analysis. The governing relations are applied to evaluate the lifetime of HDPE under creep conditions. An advantage of the proposed approach is that it predicts the stress-time-to-failure diagrams with account for the creep endurance limit.

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Section: Resultsmentioning

confidence: 99%

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

2023

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“…If there is a defect in material or the loading speed is too large, the PE pipeline will not have enough time to undergo ductile deformation and then be damaged. For slow crack growth (SCG), the failure mechanism and the fracture mode of PE pipes occur under the action of a long time and low load [43,44]. Te slow crack growth of PE pipelines is essentially caused by creep and is usually a timedependent fracture.…”

Section: Crack Development Te Crack Failure Of Pe Pipelines Includes ...mentioning

confidence: 99%

Failure Mode and the Prevention and Control Technology of Buried PE Pipeline in Service: State of the Art and Perspectives

Li¹,

Wang²,

Gao

et al. 2022

Advances in Civil Engineering

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Material defects and external environmental factors increase the engineering safety risks of buried PE pipelines in service. This paper mainly reviews the failure mode and the prevention and control technology of buried PE pipelines in service, as well as comparative failure characteristics between the buried PE and steel pipelines. The main failure factors of buried PE pipelines can be divided into four levels: the first level is third-party damage; the second level includes three failure factors, i.e., surface subsidence, joint failure, and aging failure; the third level consists of pipe piercing, crack development, and pipeline defect; the fourth level is a corrosion failure. Besides, steel and PE pipelines have various physical and mechanical properties, which lead to a significant difference in the service performance and degradation mechanism in practice. For instance, corrosion and welded joint leakage are the two common problems in steel pipelines during the service period, while PE pipelines have excellent corrosion resistance. Additionally, in order to ensure and maintain the long-term operations of PE pipelines, it is of great significance to develop and promote nonexcavation technologies of construction, renewal, and repair for natural gas-buried PE pipelines. Furthermore, based on the above studies, some further research studies on buried PE pipelines in service are suggested and discussed, e.g., (a) the service performance and degradation mechanism of buried PE pipelines in complicated environmental conditions, (b) the interaction mechanism among the engineering structure, PE pipelines, and geological environment, as well as PE pipeline geological soils coupled in multiple physical fields, and (c) the combinations of the traditional engineering risk assessment method and the numerical analysis method considering the interaction between the PE pipeline and geological environment. The results could be helpful for a better understanding of the operation conditions of buried PE pipelines, and it is also hoped that this study could provide guidance for the safe operation, maintenance, and integrity management of buried PE pipelines.

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“…Polyethylene as an important foundation of the natural gas network (1,2), the gas distribution network plays a very important role in guaranteeing the supply of natural gas, and its material selection is directly proportional to network security (3,4). Polyethylene pipeline belongs to a special composite process (5,6), which has excellent transmission performance and corrosion resistance, and it is not easy to leave natural gas impurities on the inner wall of the pipeline (7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Method for Assessing Damage to Gas Distribution Network Pipelines based on Nonlinear Guided Wave

Palaev G.,

Fuming,

Yifan

2024

IJE

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Polyethylene pipeline is an essential infrastructure of gas distribution network, and there are some problems such as complex damage assessment and tedious assessment process. How to choose an effective damage assessment method for polyethylene pipelines is the focus of the implementation of the gas distribution network at present. In this paper, a nonlinear directional wave method is proposed to detect the damage of polyethylene pipeline by an acoustic wave, and the damage results of polyethylene pipeline are searched. The rationality of this method is verified by calculating the aerodynamic equation.The results show that the nonlinear fixed wave method can accurately determine the damage and crack propagation degree of the pipeline and simplify the damage assessment process, and the results are superior to the linear directional wave method. Therefore, the nonlinear directional wave can be used to assess the damage to ethylene pipelines in gas distribution networks, which has strong rationality and practicality and provides support for the actual pipeline damage assessment.

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Modeling and application of discontinuous slow crack growth behaviors of high-density polyethylene pipe with various geometries and loading conditions

Cited by 14 publications

References 34 publications

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

Lifetime Predictions for High-Density Polyethylene under Creep: Experiments and Modeling

Failure Mode and the Prevention and Control Technology of Buried PE Pipeline in Service: State of the Art and Perspectives

Method for Assessing Damage to Gas Distribution Network Pipelines based on Nonlinear Guided Wave

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