A rotating step shaft is loaded as shown, where the forces FA​ and FB​ are constant at 150lbf and 300lbf, respectively,

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A Rotating Step Shaft Is Loaded As Shown Where The Forces Fa And Fb Are Constant At 150lbf And 300lbf Respectively 1 (278.37 KiB) Viewed 37 times

A rotating step shaft is loaded as shown, where the forces FA​ and FB​ are constant at 150lbf and 300lbf, respectively, and the torque T alternates from 0 to 1000 lbf⋅ in. The shaft is to be considered simply supported at points O and C, and is made of AISI 1045CD steel with a fully corrected endurance limit of Se​=4C kpsi, ultimate tensile strength of Sut​=91 kpsi, and yield strength of Sy​=77kpsi. Let Kf​=2.1 and Kfs​=1.7. For a design factor of 2, please answer the following questions: (a) Determine the reaction forces at points O and C (1 point) (b) Draw shear and moment diagrams on x-y plane. (c) Draw shear and moment diagrams on x−z plane. (d) Draw torque diagram. (e) What are the mean and alternating components of the resultant moment at point B ? (f) What are the mean and alternating components of the torque at point B ? (g) Determine the minimal acceptable diameter of section BC using the DE-Gerber criterion. (h) Determine the minimal acceptable diameter of section BC using the DE-Goodman criterion. (i) Determine the minimal acceptable diameter of section BC considering yielding.