Fracture Toughness Assessment of Longitudinally Seam-Welded Gas Pipelines at Low Temperatures

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dc.authoridTorun, Ahmet Refah/0000-0001-7213-5228
dc.authoridCHOUPANI, NAGHDALI/0000-0001-7872-6408
dc.contributor.authorYengejeh, Ehsan Alipour
dc.contributor.authorTorun, Ahmet Refah
dc.contributor.authorKhajedezfouli, Mohammadreza
dc.contributor.authorChoupani, Naghdali
dc.date.accessioned2025-01-06T17:38:06Z
dc.date.available2025-01-06T17:38:06Z
dc.date.issued2020
dc.description.abstractAmerican Petroleum Institute (API) 5L X65 and X70 steel pipelines are employed widely for natural gas transportation and typically experience internal high transmission pressures and low temperatures in cold regions. Investigations show that in spite of strict inspections and controls, welding joints are commonly subjected to the presence of defects, with cracking being the most important one. Due to the many geometrical, material, and manufacturing variables involved, the failure mechanisms and procedures presented in the welded gas pipelines are complex. In order to achieve the benefits of gas pipelines, a deep understanding of the failure behavior is needed, especially in mixed mode loading conditions and at low temperatures. In this work, fracture toughness evaluation of longitudinal seam-welded gas transportation pipes at low temperatures and under mixed mode loading was studied based on experimental and numerical analysis. The experimental procedure included preparing the API X65 steel pipes, making the butterfly shaped experimental specimens, and encapsulating and insulating specimens in order to control and stabilize the temperature of test. By utilizing the Arcan fixture, the experiments carried out under different loading conditions at low temperatures and fracture forces by using force-displacement diagrams were obtained. Stress intensity factors (SIFs) for tensile and shear loading were found by numerical analysis and geometry correction factors were determined. The results indicated that the fracture toughness of the seam-welded samples decreased at lower temperatures, and it is strong to the tensile mode loading but weak to the shearing mode loading. The tensile and shear values of fracture toughness of seam weld under consideration for the temperature of -25 degrees C were found 203.3 and 11.8 kJ/m(2), respectively. (c) 2020 American Society of Civil Engineers.
dc.identifier.doi10.1061/(ASCE)PS.1949-1204.0000502
dc.identifier.issn1949-1190
dc.identifier.issn1949-1204
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85089750026
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1061/(ASCE)PS.1949-1204.0000502
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2477
dc.identifier.volume11
dc.identifier.wosWOS:000615096200021
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAsce-Amer Soc Civil Engineers
dc.relation.ispartofJournal of Pipeline Systems Engineering and Practice
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectGas pipeline
dc.subjectLongitudinally seam welded
dc.subjectCrack
dc.subjectFracture toughness
dc.titleFracture Toughness Assessment of Longitudinally Seam-Welded Gas Pipelines at Low Temperatures
dc.typeArticle

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