微小セパレーションが発生する場合の疲労亀裂伝播について

概要

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Previously, we investigated the fatigue strength of TMCP steel, with tendency to occur separation, and proposed the method of its evalution. Moreover, we clarified that the micro-separation existed in the fatigue crack surface, and reported on the effect of micro-separation on the fatigue crack growth rate. But the effect of maximum separation index on the fatigue strength was not found clearly in the fatigue crack growth rate. In this paper, we have studied the effect of micro-separation on the propagation of fatigue crack, and the method of its evalution. The results obtained are summarized as follows; 1) The propagation of fatigue crack is influenced by the occurence of micro-separation in case the crack propagates through the ferrite-pearlite layers. 2) The propagation of fatigue crack affected by the micro-separation, can hardly be evaluated by the fatigue crack growth rate. 3) The effect of micro-separation on the propagation of fatigue crack can be evaluated by dividing of the number of cycles into the repeated numbers during propagating and stagnating.
社団法人日本船舶海洋工学会の論文
1988-08-25