Plastic constraint correction using the equivalent CTOD concept has been studied in the IST project. This project was carried out over a 3-year period with the foundation of METI in Japan, and the results were summarized in a draft standard, “Method of constraint loss correction of CTOD fracture toughness for fracture assessment of steel component.” Equivalent CTOD ratio β is proposed in terms of constraint loss correction between the fracture performance of steel structures and fracture toughness tests using the Weibull stress as the driving force of brittle fracture. This paper provides the application procedure of Equivalent CTOD ratio to the fracture assessment of structural components. Equivalent CTOD ratio was taken in the fracture assessment diagram, and discussed the applicability by comparison with large scale test result of structural component such as Edge Surface Crack Panel, Center Through-wall crack panel and so on.

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