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SSC of TMCP Materials: Criticalities among the Methodologies for Load Definition

The Sulfide Stress Cracking evaluation based on Four Point Bend Test specimens (FPBT-SSC) is widely used to assess Line Pipes performance on sour environments. An important stage of the test configuration is to determine the strain corresponding to the desired load (e.g., 90% AYS) and different methodologies can be used. The present work studies these different methodologies and their influence on the applied FPBT-SSC load. Tensile specimens were machined from DNV450 sour grade pipes at a location as close as possible to 4PBT samples. The tensile test results were used to define the strains considering: i. the linear behavior until the Yield Strength and ii. the actual Stress-Strain curve considering both flattened and un-flattened specimens. The stress-strain curve exhibits a deviation from the linear behavior, typical of the tensile evaluation of cold-formed materials (Ramberg-Osgood). This deviation is higher in flattened specimens, due to additional Bauschinger effect. The deviation caused a higher obtained strain by considering the stress-strain curve method in comparison with the linear method (approx. 20%).
Product Number: 51324-21105-SG
Author: Joao Paulo Costa; Fabio Arroyo; Philippe Darcis
Publication Date: 2024
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