海洋環境下の構造用鋼切欠き材の疲労強度(<特集>疲労特集)

概要

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The fatigue tests were conducted for high-strength steels, HT50 and HT80, in laboratory air, in ion exchanged water and in synthetic seawater, systematically. Three types of the notched specimens were used: shaft specimens with a groove, with a transverse hole and with a shoulder fillet. The results obtained were as follows: (1) Synthetic seawater reduced the fatigue strength considerably. However, the strength in the synthetic seawater decreased slightly with an increase of α_k (stress concentration factor) in comparison with that in laboratory air or in ion exchanged water. (2) a notch reduced the fatigue strength remarkably in laboratory air in ion exchanged water in the order of the specimens with a hole, with a shoulder fillet and with a groove, and HT80 was more sensitive to the notch than Ht50. (3) The increase of β_k(fatigue notch factor) with increasing α_k was smaller in synthetic seawater than that in laboratory air, but it was much larger than in ion exchanged water.
社団法人日本材料学会の論文
1987-10-15