炭素鋼の淡水中腐食疲れのS-N曲線について

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doi:10.1299/jsmemag.67.542_517_2

炭素鋼の淡水中腐食疲れのS-N曲線について

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On the S-N Curve of Carbon Steel under Rotary Bending Conditions in City Water
タンソコウノタンスイチュウフショクツカレノ S-N キョクセンニツイテ

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Specimens of annealed 0.35 % C steel were submitted to rotary bending tests in city water at speeds of 1500, 750 and 50 rpm. It was found that the S-N curve of each cyclic frequency, tends to approach the horizontal, however, under continued testing conditions it begins to descend again. In the range below the horizontal, the time until fracture at low cyclic frequency, was shorter than that at higher frequencies. In this range the intermittent pause test, during which the spechnen are in contact with water, shortened the life of specimen in comparison with the sontinuous test. The author endeavours to explain this phenomenon by considering that at high stress, growth of cracks is mainly attributable to stress, and that at low stress it is related to stress and the corrosive effect of water, however, that it is more difficult for the water to enter into the end of deep cracks.