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概要

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Some experiments were made to investigate the characteristics of the Kahn tear test. Loading was stopped on the way to the maximum load, and the load removed. Then the deformation of the specimen was scrutinized by a comparator. The deformation was also measured of the specimen tested to the maximum load. Plastic strain distributions of the specimens were given in Figs. 3∿5,in which it was proved that no difference was detectable about the deformation between specimens loaded at temperatures above or below the transition. Sections of specimens were then investigated to see the state of crack initiation at the notch root. The examination of micro-structure showed that a crack initiated at about 90% of the maximum load, then grew to the depth corresponding to the local shear adjacent to notch in fractured surface of specimen cooled below the transition temperature.
社団法人溶接学会の論文
1955-06-01