構造用特殊鋼の疲労並びに靜的強度

概要

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Rotary bending, tensile and compressive, torsional fatigue limit and statical tensile and torsional strength after normal heat treatment of Ni Cr-Mo, Ni-Cr-V, Ni-Cr, Cr-Mo steel for constructional use are shown. (1) Fatigue limits for turned surface showing about 4μ surface roughness and surface of 1μ roughness obtained by sand paper polishing after turning are compared. Such difference of surface finishing hardly affects the fatigue limits. (2) Ratio of the tensile and compressive fatigue limit to the statical tensile .strength is about 0.48. Ratio of the bending fatigue limit to the tensile strength is 0.46-0.56. Ratio of the rotary bending fatigue limit to the statical torsional strength is 0.51-0.60. Ratio of the torsional fatigue limit to the torsional strength is about 0.38. (3) Ageing effect of heat treatment is not remarkable for Ni-Cr-Mo steel after 3-6 months elapsed. (4) Fatigue limit decreases slightly for increased mean stress, and does not fall suddenly when maximum stress exceeds the yield point. (5) Ni-Cr-V steel is superior to others within the experimented range.
宇宙航空研究開発機構の論文
1954-03-23