3. The diameter of the main shaft portion, labeled A, B, and C is 8.736 in. The left load 20 kip remains constantly applied, while the right load is applied and changes from 40 to 80 kip as the machine cycles. Determine the stress ratio for the point B. Also, for the same point, use the maximum shear stress theory to determine a specific material type under Aluminum alloy 2219. Take safety factor N = 4. (20' in total) A 20 kip 12 B Dimensions in inches 16 Bearings at A and C act as simple supports 40-80 kip

Fig: 1