切欠き材の疲労限度の推定法についての検討 : (ε_0理論に基づく切欠き係数の計算法)

概要

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To investigate the "fatigue strength reduction factor"(β), data of fatigue limit which have already published are analyzed by the "modified ε_0method"which considers the high-degree term components of the stress distribution at the notch root.The relationship between tensile strength (σ_B)and material constant(ε_o)is ε_o=103・σ_B^-1.12for JSME's data and is ε_o=25.7・σ_B^-1.04 for Nishitani's data but in JSME's data the expected difference between σω_1 and σω_2is not recognized and in Nishitani's data the unexpected dependency of the notch root radius onε_0 occurs.The factors β for individual data are calculated by using the above two relationships and are compared with experimental data.The results show that β calculated by the relation of ε_0=103・σ_B^-1.12 coincides with β obtained from the JSME's proposal equation for JSME's experimental data, but is critical for Nishitani's data.On the other hand, the relationship ε_0=25.7・σ_B^-1.04 give conservative β which is convenient for structural design in both JSME's and Nishitani's data.
社団法人日本機械学会の論文
2000-01-25