シャルピー衝撃試験における試験片巾の影響 : シャルピー衝撃試験における荷重-時間曲線の研究 III

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The effect of the specimen width on the Charpy test was studied with specimens of hot-rolled mild steel and quenched-and-tempered medium carbon steel, by recording the load-time relations under impact bending. Results obtained were summarized as follows : (1) The energy absorption in the ductile range was influenced by the specimen-width smaller than 4mm-the smaller the width, the lower the energy absorption per unit sectional area and it was found that the law of similarity was not satisfied in this case. On the contrary the maximum fiber fracture strength was almost constant for all the specimens, showing the applicability of the law of similarity. (2) Maximum fiber bending stress in fracture was the largest in the temperature range where the absorption energy was decreased almost to minimum value and the load-time curve of type II designated by the authors in the previous papers was obtained. (Tetsu-to-Hagane 46 (1960) p.141, 1538 ; Tetsu-to-Hagane Overseas, 1 (1961) p.38). (3) The brittle specimens tempered at a rather lower temperature after quenching, showed the type I or II load-time curves over all the testing temperature, and thus fractured thoroughly with only a crack, once started. It was found that in these tests the fracture strength scattered considerably. (4) The notch shape had an influence on the absorption energy for ductile fracture of the less ductile specimens with tempered martensite. It was concluded that the above effect was mainly due to the difference of the amount of deformation produced until the crack formation. (5) The transition temperature showed the same tendency to the changes of specimen-width under any definition, rising as the width increased. However, the change of the transition temperature for the specimen-witdh larger than 6mm showed the considerablly different tendency from that of the specimen smaller than 4mm. Therefore, in the application of subsize specimen, it is desirable to use the specimen-width larger than 6mm. The effect of specimen-width on transition temperature was affected markedly by the types of the steels and their microstructures.
社団法人日本鉄鋼協会の論文
1963-04-01

シャルピー衝撃試験における試験片巾の影響 : シャルピー衝撃試験における荷重-時間曲線の研究 III

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