新制御圧延鋼の疲労強度におよぼすセパレーション発生量の影響と評価

概要

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Our previous paper made it clear that the brittle crack propagation-arrest characteristic of TMCP steel plate would be enhanced with the increase in its maximum separation index (SI_<max>). However, in order to successfully utilize the TMCP steel plate which are prone to the separation, it is necessary to investigate the effect of the separation on the strength of large welded structures. A study therefore was performed with an emphasis on evaluateing the effect of the separation on the fatigue strength of TMCP steel plate, with the results as encapsulated in the following. (1) The fatigue life tends to increase with the separation index. (2) The fatigue strength is influenced by the angle between progressing direction of fatigue crack and ferrite-pearlite layer. (3) The effect of the separation on the fatigue strength in the direction of plate thickness is not recognizable. (4) At low temperatures, the bending fatigue strength of TMCP steel plate is nearly equal to that of conventional steel plate.
1985-08-24