Fracture Behavior of Locally Corroded Steel Pipeline in District Heating System Using the Combination of Electrochemistry and Fracture Mechanics

다국어 초록 (Multilingual Abstract)

To identify the effects of the stress concentration at the pit on the fracture of the district heating (DH) pipeline, the stressincrease with the wall thickness reduction was formulated. The formula includes the stress intensity factor with the pittingcorrosion. As a result of the application of the DH pipeline conditions to the ASME B31.3 code formula and corrosion test,the interplay with only uniform corrosion and stress due to the internal pressure can not be an immediate reason for the DHpipeline fracture. The KIvalue which is calculated by loss of thickness due to both uniform and localized corrosion exceededfracture toughness value (42 MPa√m) of the weldment pipeline steel (ASTM A106 Gr. B) under all of the studied conditions.

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