High Temperature Rotating Bending Fatigue Characteristic for SUS403 Notched Round Bar

[Abstract] 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)√ 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√. Using these results, the estimated fatigue limit was satisfactory and the predicted accuracy was ±10％.Copyright (c) 2008, 一般社団法人日本機械学会, rights: 本文データは学協会の許諾に基づきCiNiiから複製したものである, relation: isVersionOf: http://ci.nii.ac.jp/naid/110006685197