The figure bellow shows a shaft and the fluctuating nominal stress acting on it. The shaft...

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The figure bellow shows a shaft and the fluctuating nominal stress acting on it. The shaft is made of AISI 1095 Hot-Rolled steel. The fatigue stress concentration factors at the critical sections A, B, and C are given as: Section A: Bending Ky= 2.0, Torsional K,= 1.75 Section B: Bending Kf= 1.5, Torsional K,= 1.35 Section C: Bending K, 1.7, Torsional K,= 1.40 Estimate the factor of safety guarding against fatigue failure if the nominal stresses are combined (bending plus torsional) of the same magnitude and phase as shown. 1.5-mm rad. 60 mm A 50 mm 5-mm rad. 5-mm rad. B 60 mm C 50 mm +80 -20 Nominal stress [MPa] M Time The figure bellow shows a shaft and the fluctuating nominal stress acting on it. The shaft is made of AISI 1095 Hot-Rolled steel. The fatigue stress concentration factors at the critical sections A, B, and C are given as: Section A: Bending Ky= 2.0, Torsional K,= 1.75 Section B: Bending Kf= 1.5, Torsional K,= 1.35 Section C: Bending K, 1.7, Torsional K,= 1.40 Estimate the factor of safety guarding against fatigue failure if the nominal stresses are combined (bending plus torsional) of the same magnitude and phase as shown. 1.5-mm rad. 60 mm A 50 mm 5-mm rad. 5-mm rad. B 60 mm C 50 mm +80 -20 Nominal stress [MPa] M Time

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