軟鋼の脆性破壊に就いて(第3報)

概要

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In the 1 st and 2 nd report, we have obtaind the formula showing the transition temperature of notched specimen in terms of the ratio of notch radius to thickness of specimen, of notch depth and of notch angle, and the validity of the formula have ascertained by many experiments performed by Bagser, Thomas and Boodberg, etc. Furthermore, in the 2 nd report, we have checkd the theoretical relation by Charpy impact test. In this paper, using the same steel as in the 2 nd report, we have investigated the effect of notch radius, notch depth and thickness of specimen etc. on the transition temperature, and it has been found that the effect of these factors are expressed by the theoretical formula, as in the case of Charpy impact test. We have also studied the relation between these factors and absorbed energy, at constant temperature, and nominal maximum fibre stress, and we have obtained the facts that absorbed energy drops as increase of notch depth and thickness of specimen, and decrease of notch radius, and the nominal maximum fibre stress drops as increase of notch depth.
社団法人日本船舶海洋工学会の論文