耐候性鋼板の腐食疲労

概要

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The corrosion-fatigue properties of weathering steel in sea water investigated with reference to its utility and efficiency as shipbuilding material. Repeated tension (in low-cycle ranges ) and reversed bending (in low-and High-cycle ranges) t ests were applied on weathering steel plates. In low-cycle fatigue, the frequency, of stress is respectively 10 cpm for repeated tension and 7 or 30 cpm for reversed bending. In the high-cycle, only for reversed bending it is 1500 or 2200 cpm. The results obtained are as follows:- (1) In the low-cycle range, but little effect of corrosion is seen on the fatigue strength in repeated tension, but a little effect is observed in reversed bending. (2) In the high-cycle range, there is remarkable influence of corrosion on fatigue of weathering steel, and there is no fatigue limit, such as seen in air. If the coefficient of corrosion-fatigue is defined as k=(N_A-N_s)/N_A×100(%), where N_A and N_s are the number of reversals of stress to fracture in air and in sea water respectively, the smaller the applied stress is the larger the coefficient of corrosion-fatigue is. (3) The fatigue strength in aqueous solution saturated with H_2S was also examined.
社団法人日本材料学会の論文
1968-08-15