鋼線の疲労に関する研究(第5報) : 硬鋼線の回転曲げ疲労強度に及ぼす軸方向残留応力の影響について

概要

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This investigation was planned for finding out an experimental equation expressing the relation between fatigue limit and longitudinal residual stress. For the testing material, 0.6 % carbon steel wire drawn with 82.5 % reduction was used, and this original wire was drawn with various additional fine reductions. When we compared the original wire with the additionally drawn wire with 0.75 % reduction, the longitudinal residual stress was decreased in the latter case, but the mechanical properties were not almost changed by the additional drawing. And in both wires, the longitudinal residual stress was not altered by the repeat of stress equal to fatigue limit σ_W'. Therefore, making a comparison between σ_W' and max tensile residual stress σ_R of both wires, we found that the following equation might be established, if σ_R was not altered by the repeat of stress equal to σ_W' : σ_W'=σ_<W0>'(1-σ_R/σ_T) where σ_<W0>' is fatigue limit under rotary bending without the contribution of residual stress, σ_T is breaking strength on final area. And in a range of tensile strength σ_B=140〜180 kg/mm^2, it was found that σ_W'/σ_B=0.30〜0.38 and σ_<W0>'/σ_B=0.33〜0.40 on various hard drawn steel wires satisfying the condition of the above equation.
1961-06-15