丸棒試験片による衝撃曲げ試験について : 環状U切欠き付試験片の形状と寸法の影響

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Instead of the conventional Charpy test using a 10 mm square bar specimen with U-notch of 1 mm radius and 2 mm depth [(a)-specimen], the Izod test using a round bar specimen has been sometimes used by the present authors, for convenience of machining and heat treatment of its specimen. The standard specimen being used by them is a round bar of 14 mm diameter with a circumferential U-notch of 1 mm radius and 2 mm depth [(b)-specimen]. But it is frequently required to use slenderer specimens. In the present experiment, two kinds of selenderer round bar specimens of heat treated 0.55% carbon steel were investigated for their impact properties by the instrumented impact test. One was a round bar of 11.5 mm diameter with a geometrically similar notch to the standard specimen [(c)-specimen]. The other was a round bar of 11.5 mm diameter with a different shape notch, but the minimum diameter and the stress concentration factor of the notch were equal to those of the standard [(d)-specimen]. The results obtained are as follows: (1) The individual impact values (Total, crack initiation and propagation) I_<r1> of (c)-specimen were approximately related to those I_c of (a)-specimen by the equation I_<r1>=0.8I_c. This relationship has been well established between (b)-specimen and (a)-specimen. (2) In the case of impact value I_<r2> of (d)-specimen, the crack initiation impact value was relatively large. The relation, I_<r2>=2I_c, was found to exist between the crack initiation impact values of (d)-specimen and (a)-specimen. However, the crack propagation impact value was related to that of (a)-specimen by the equation, I_<r2>=0.8I_c, as similar to the case of other round bar specimens.
社団法人日本材料学会の論文
1984-06-15

丸棒試験片による衝撃曲げ試験について : 環状U切欠き付試験片の形状と寸法の影響

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