環状切欠き付SUS403材の高温回転曲げ疲労特性

概要

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In order to study the notch effect on rotating bending fatigue properties for SUS403 stainless steel, the rotating bending fatigue tests were carried out at room temperature, 300℃ and 600℃ with a frequency of 1200 cycles/min. The temperature dependence of fatigue limit and the estimation method of fatigue notch factor were investigated. The relationships between the fatigue limit σ_W of smooth specimen and the tensile strength σ_B and also σ_W and the Vickers hardness HV were obtained as σ_W=0.58σ_B=1.63HV at every temperature. Furthermore the relationship between the parameter (β-1)√<σ_0/σ_B> and Kt-1 was proposed to estimate the fatigue notch factor, where σ_0 is the tensile strength at room temperature, β is the fatigue notch factor at a certain temperature and Kt is the stress concentration factor. Then fatigue notch sensitivity factor η was obtained as η=0.056√<σ_B/Kt>. Using these results, the estimated fatigue limit was satisfactory and the predicted accuracy was ±10%.
一般社団法人日本機械学会の論文
2008-05-25