単一試験片による J-R カーブ測定への直流電位差法の適用

概要

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The fracture toughness tests at temperatures from -60℃ to 100℃ are conducted to develop the new method for the generation of the fracture resistance curve (J-R curve) by a single specimen. The three-point bend specimens with several configurations made of four kinds of nuclear reactor pressure vessel steels are used and the crack extention is measured by the d. c. electrical potential method during testing. From the results obtained, the following conclusions can be drawn : (1) The relation between the potential difference (V_0+⊿V)/V_0 and the ratio of crack extention (a_0+⊿a)/a_0 is a very little bit scattered regardless of the specimen size, type of steels or testing temperatures, when the specimen configurations are kept as the similar figure. Where, a_0, ⊿a, V_0 and ⊿V respectively denote the initial crack length, the amount of crack extention, the initial potential and the amount of potential difference. This relation is named here as the master curve. (2) Then, the J-⊿a relation (J-R curve) can be developed using the load-deflection record by a single specimen through the above mentioned master curve.
社団法人日本鉄鋼協会の論文
1982-06-01