衝撃試驗に関する一考察(第 1 報)

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Series of double blow impact test were performed on V-notched Charpy specimens at temperatures, -50℃ to 70℃. The depths of cracks created by first light blows were detected by dripping etching solution at the notch roots of specimens and then breaking them by the second standard blows, which demonstrated the energy for propagating these cracks. Also, standard single blow Charpy test was carried out at the same testing temperature. Combining these three energy values, the effects of velocity diffeerences were eliminated from the first light blows. thus the energy for crack initiation could be determined. The same steps were taken at different test temperatures. The Fig. 3,4 and 5 show the experimental results. From those figures, the effects of temperature on the energies for crack initation (W_i) and porpagation (W_p) were determined as in Figs. 6,7 and 8. Then, the meannings of 15 ft-lbs or 1/2 maximum energy transition temperatures could clearly be understood. Also the percent shear∿temperature curves in Fig. 12 were proved to possess close correlations with the W_p∿temperature curves. For three kinds of steels investigated, the orders of the locations and the maximum values of W_i∿temperature curves coincided well with those of W_i∿temperature curves. But there was no correlation between the order of location and the maximum values of W_i or W_p∿temperature curves in the three steels. Further, the effects of impact velocities on W_i and W_p at various temperatures were discussed making use of the test results in Figs. 3∿5.
社団法人溶接学会の論文
1954-12-01

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大谷碧
鉄道技術研究所

衝撃試驗に関する一考察(第 1 報)

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