衝撃試驗に関する一考察(第 2 報)

概要

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Series of double blow impact tests were performed on U-notched Charpy specimens at temperatures, -65℃ to 60℃, to divide the total energy absorbed into the energy for crack initiation (W_i) and the one for crack propagation (W_p). The same experimental procedure was adopted as previously mentioned in the 1st report. The Figs. 1∿3 show the test results. From those figures, both the W_i and W_p∿temperature curves were determined (Figs. 4∿6). Compared with the results of V-notched specimen, the W_i∿temperature curves became much higer in their maximum values and shifted towards lower temperature side, while the W_p∿temperature curves remained practically unaltered. Mcst part of W_c consisted of W_i below the room temperature in U-notch test. The percent shear∿temperature curves in Fig. 10 were also proved to possess close correlations with W_p∿temperature curves. For three kinds of steels investigated, the order of the locations and the maximum values of W_i and W_p∿temperature curves showed the same relations as V-notch inpact test. The good correlations were found between transition temperatures determined by low energy levels for U and V-notch test. Further, the effects of impact velocities on W_i and W_p were discussed, and found to be all the same as in V-notch test.
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