621 複合荷重下における疲労強度に及ぼす応力集中の影響(OS12-1 複合荷重下における疲労および疲労き裂進展挙動の最先端研究,OS12 複合荷重下における疲労および疲労き裂進展挙動の最先端研究)

概要

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The effect of stress concentration on fatigue strength under cyclic torsion with and without static tension was investigated. Two materials, carbon steel SGV410 and austenitic stainless steel SUS316NG for nuclear power plant, were used. The characteristic of S-N curve was different for materials. The fatigue life of SGV410 decreased by static tensile stress. In contrast, as for the smooth specimen of SUS316NG, the fatigue life increased by static tensile stress in the high stress amplitude area over 170MPa. In addition, the larger the stress concentration factor, the longer the fatigue life of notched specimens in the high stress amplitude area. It was confirmed that the S-N curves corrected in consideration of elastic-plastic state on the surface of solid cylindrical specimens approached those of hollow specimens.
一般社団法人日本機械学会の論文
2007-10-24