等価応力比にもとづく疲労強度の整理法と切欠効果の考察(S14-2 切欠き効果と圧縮疲労強度特性,S14 金属材料の疲労特性と破壊機構)

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  • Diagraming of Fatigue Strength and Interpretation of Notch Effect Based on the Equivalent Stress Ratio

説明

Based on an equivalent stress ratio R_<EQ> which was previously proposed as a parameter for correspondence between the cyclic stress conditions of notched and unnotched specimens, the fatigue strength concerning axial, bending, torsional and their combination loading is rearranged on the diagram where the abscissa indicates R_<EQ> and the ordinate indicates the notch-root-concentrated stress range (Δσ_<NR.w1>). As a result, it is found that the diagram is consistent in spite of differences of stress concentration factors and loading types. Moreover, the notch sensitivity of material is discussed on the basis of the diagrams.

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