Indexed by:Journal Papers
Date of Publication:2020-02-15
Journal:OCEAN ENGINEERING
Included Journals:EI、SCIE
Volume:198
ISSN No.:0029-8018
Key Words:Welded clad pipeline; Weld toe; Surface crack; Reference strain fracture assessment formulation
Abstract:In welded clad pipelines, the weld toe is a critical failure position due to the combined effects of the potential weld defects and the stress concentration induced by weld reinforcement. The fracture risk in this position has seldom been assessed. Moreover, the pipelines are often exposed to complicated loading environments during the service period. Thus, the fracture responses of the pipelines with a crack at the weld toe and subjected to tension and internal pressure are considered in this study. A reference strain fracture assessment formulation is derived for the weld toe crack in welded clad pipelines. The formulation detailed expression form is determined by the extensive parametric finite element (FE) analyses and standard least square fitting method. The accuracy of the proposed formulation is validated by conducting a comparative study in J values attained from the formulation and FE analysis. Finally, a further study on extending the application range of the estimation formulation is carried out.
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