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please provide steps A circular shaft is subject to a combination of loading as: - Constant shear stress of 56MPa - Constant normal axial stress

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A circular shaft is subject to a combination of loading as: - Constant shear stress of 56MPa - Constant normal axial stress of 70MPa - Completely reversible bending normal stress of 140Mpa The ultimate tensile strength Sut=525MPa, yield strength Sy=450MPa and the fully corrected endurance limit Se=202MPa. The fatigue stress concentration factors (kf)ax=(kf)bend=(kf)tor=1.2 1-Determine the design factor (nf) for infinite life against fatigue failure using Goodman criteria. If nf

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