延性き裂発生ひずみに及ぼす寸法の影響

概要

論文の詳細を見る
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 effect of specimen size on the critical strain at the onset of fibrous crack is investigated. The test was performed under quasi-static tensile load applied on round bar specimens of SM 490 steel 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) No apparent correlation is observed between fibrous crack initiation strain and specimen size ; and (2) The fibrous crack initiation strain tends to slightly decrease with notch sharpness but is approximately equal to the stability limit strain sustaining the maximum load.
社団法人日本建築学会の論文
1994-04-30