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Report No.

A Round robin program of master curve evaluation using miniature C(T) specimens, 2; Fracture toughness comparison in specified loading rate condition

Yamamoto, Masato*; Onizawa, Kunio ; Yoshimoto, Kentaro*; Ogawa, Takuya*; Mabuchi, Yasuhiro*; Miura, Naoki*

Master Curve (MC) approach for the fracture toughness evaluation is expected to be a powerful tool to assess the structural integrity of reactor pressure vessels (RPVs). In order to get sufficient number of reliable data by the MC approach from used specimens of surveillance tests for RPVs, the use of miniature specimens is necessary. For this purpose, a round robin test program on the miniature compact tension specimens (Mini-CT) of 4 mm thick for the MC approach was launched with the participation of academia, industries and a research institute in Japan. The program aims to verify the reliability of experimental data from Mini-CT, and to pick out technical issues to be solved. As the second step of this program, the effect of loading rate (d$$K$$/d$$t$$) was evaluated based on enlarged database. Despite of the difference in d$$K$$/d$$t$$, no specific difference in scatter band of $$T_{rm 0}$$ was found in d$$K$$/d$$t$$ - $$T_{rm 0}$$ relationships. D$$K$$/d$$t$$ seems not to be sensitive on scatter band of To in the present results.



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