800MPa高張力鋼の延性き裂発生ひずみに関する研究(一般講演)

概要

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Brittle fracture in large steel structures subjected to high stress reversals is triggered by fibrous cracks initiated at stress concentration spots such as toes of weld. In this study the effects of specimen size and notch sharpness on the critical strain at the onset of fibrous crack are investigated for 800-MPa tensile strength steel. The test was performed under quasi-static tensile load applied on round bar specimens having a circumferential notch at the center. Three different diameters of bars and six different shapes of notches were examined in order to investigate their influences. Major findings are: (1) Size effect on fibrous crack initiation strain is not observed; and (2) The fibrous crack initiation strain tends to decrease with notch sharpness but is safely approximated by the uniform strain of the material except for very sharp notches.
一般社団法人日本建築学会の論文
1994-03-15