Abstract

The goal of the study was to compare JR-curves from testing on relatively small conventional specimens of a pressure vessel steel with results from large slightly curved surface cracked (SCT) plates subjected to different loading histories. Six SCT experiments were carried out at 20°C and three at 60°C. Unstable crack growth occurred very shortly after crack growth initiation in four of the tests at 20°C, while some amount of stable crack growth was observed in the remaining two and in all of the small specimens. The analysis showed that initiation occurred at roughly the same value of J for all the SCT specimens. For all three SCT experiments carried out at 60°C ductile crack growth was observed. The JR-curves from the SCT tests coincided qualitatively with each other as well as with the results from CT testing. It seems that the JR-philosophy can be used if the temperature is well above the transition temperature. The initiation point is well predicted while some deviations can occur at larger crack growth increments if the loading is mainly of tensile character. This also holds for the initiation event at the lower temperature while for the further growth the situation is less clear.

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