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ISO 15653 is a Crack Tip Opening Displacement (CTOD) testing standard for welds, and has issued since 2010. This new testing standard consists of two different CTOD calculations, displacement-conversion CTOD for deep-notched specimens and J-conversion CTOD for shallow-notched specimens, and ISO 15653-based CTOD changes at the boundary of crack length between deep-notched and shallow-notched specimens. In this study, changes in ISO 15653-based CTOD were investigated by using experimental and analytical data for the wide range of steel mechanical properties. J-conversion CTOD did not correspond to displacement-conversion CTOD, and there were significant mismatches in ISO 15653-based CTOD at the crack length boundary particularly for the steels of the low strain hardening exponent of the Ramberg-Osgood relation. Displacement-conversion CTOD calculation by using the modified plastic rotational factor or using the CTOD transformation equation proposed in this study is helpful in moderating the underestimated CTOD for low strain hardening exponent shallow-notched specimens.

Changes in ISO 15653-Based CTOD for Specimens of <I>a</I><SUB>0</SUB>/<I>W</I>=0.45