Ashaft is subjected to steady torsional stress τ=25 kpsi and alternating (fully reversed) bending stress σ=30 kpsi. the material is steel with sut=70 kpsi, sy=70 kpsi and se=35 kpsi that includes the modifying factors. a. calculate the static safety factor ηy for yield. b. calculate the fatigue safety factor ηf for infinite life using modified goodman criterion. c. calculate the fatigue safety factor ηf for infinite life using asme elliptic criterion.

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