大型試験片による疲労試験 : 変動応力の影響およびαとσ_<ω1>,σ_<ω2>の関係

概要

論文の詳細を見る
As one of the methods of investigation of fatigue strength of metal under service load, the control-apparatus for variable load was added to 1.6 t-m rotary bending fatigue testing machine.By means of this machine, the following fatigue tests have been conducted.(1) The relation between α and σ_<w1>, σ_<w2> for SS41, large sized V-notched test piece.(a) σ_<w1>≃(σ_<w0>/α)where σ_<w0>: Fatigue limit of plain test piece.α: Stress concentration factor.σ_<w1>: Minimum stress, cracked, at 10^7 repetitions.(b) σ_<w2>≃6kg/mm^2 σ_<w2>Maximum stress, without any crack developed, at 10^7 repetitions.(2) Σ(n/N) of fatigue strength under variable load.(Since wave and modified rectangular wave) is (0.70〜1.88).where, test pieces are V-notched type (ρ=1 mm, d=60mm, D=87mm)
社団法人日本材料学会の論文
1967-06-15