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Report No.

International round robin test on Master Curve reference temperature evaluation utilizing Miniature C(T) specimen

Yamamoto, Masato*; Onizawa, Kunio ; Yoshimoto, Kentaro*; Ogawa, Takuya*; Mabuchi, Yasuhiro*; Valo, M.*; Lambrecht, M.*; Viehrig, H.-W.*; Miura, Naoki*; Soneda, Naoki*

In order to ensure the robustness of the Master Curve technique, round-robin tests were performed using 0.16 inch-thick Mini-CT specimens by different investigators to see if consistent $$T$$$$_{0}$$ values can be obtained. All the specimens used were machined and pre-cracked by one fabricator from unique Japanese RPV material. Seven institutes participated in this exercise, and obtained valid $$T$$$$_{0}$$ values according to the ASTM E1921 standard. The scatter of $$T$$$$_{0}$$ values obtained was well within the uncertainty range defined in the standard, indicating the robustness of the Mini-CT specimen test technique. Throughout this activity, we could obtain 182 $$K$$$$_{Jc}$$ for a single material. We investigated the statistics of this large database, and found that there is no remarkable difference not only in the $$T$$$$_{0}$$ values but also in the fracture toughness distribution between the Mini-CT specimen and the standard size 1T-C(T) specimen results.



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