2021 №01 (05) DOI of Article
2021 №01 (07)

The Paton Welding Journal 2021 #01
TPWJ, 2021, #1, 29-34 pages

Numerical analysis of the features of limiting state of welded pipeline elements under ultra-low-cycle loading conditions

O.V. Makhnenko, O.S. Milenin, O.A. Velykoivanenko, G.P. Rozynka and N.I. Pivtorak
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Expert analysis of the reliability and performance of welded pipelines with detected corrosion-erosion damage under ultra-low-cycle loading requires taking into account several interrelated physicomechanical phenomena, which determine the limiting state of a specific structure. For this purpose, integrated numerical procedure was developed in this study for finite-element assessment of subcritical fracture accumulation and prediction of the limiting state of typical pipelines with 3D defects of wall thinning. The ductile mechanism of subcritical fracture was considered as the main one. Moreover, material hardening and softening at plastic deformation (strain hardening, Bauschinger effect) was taken into account. This integrated approach allowed revealing the main regularities of failure of a typical pipeline element, depending on external loading. 14 Ref., 7 Figures.
Keywords: welded pipeline, corrosion-erosion defect, ultra-low-cycle loading, Bauschinger effect, ductile fracture, limiting state

Received 30.11.2021


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