Problem 1Obtain a preliminary design of the shaft by performing the following tasks. Note that forces Tj=2880N and T2=432 N. The maximum bending moment is at x=230 mm (point B), and it equals M= 698.3N•m completely reversed, where the torque is constant at 612 N.m at the same point.The shaft material is AISI 1020 CD steel. Take the stress concentration conditions at B to be Shoulderfillet-sharp, with notch radius r=0.6 mm (Table 7-1).230 mmT,280 mm30-mm dia.300 mm250-mm dia.400-mm dia.270 N1800 Na) Sketch a general shaft layout in 2D (x – y axes), including all components and torques, thencalculate all reactions.b) Based on the current shaft dimensions and using only forces at B and C, find the lowest criticalspeed of the shaft.c) Determine the fatigue factor of safety of the rotating shaft with the current dimensions using theDE-Gerber criteria. Use Eqs. 6-8 and 6-18 to find the endurance limit, account only for ka andk, in Eq. 6-18 and assume all remaining factors as 1.

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