PROB. 3.8-4 3.8-5 A stepped shaft ACB having solid circular cross sec- tions with two different diameters is held against rotation at the ends (see figure). max (a) If the allowable shear stress in the shaft is 42 MPa, what is the maximum torque (T)x that may be applied at section C? [Hint: Use Eqs. (3-49a and b) of Example 3-9 to obtain the reactive torques.] (b) Find (To)max if the maximum angle of twist is limited to 0.55°. Let G = 73 GPa. 38 mm 19 mm B 150 mm- To 380 mm

F5. The circular shaft AC is fixed to rigid walls at A and C. The section AB is solid annealed bronze and the hollow section BC is made of aluminum alloy 2024 T-4. There is no stress in the shaft before the 20,000 ft-lb torque is applied. Determine the maximum shearing stress in each shaft after T is applied. Section BC 4 D=4" 20 ft-k 6.5-FE B 5ft Match each item to a choice: TAB TBC 2"

*R9 4. Two A36 steel pipes, cach having a cross-sectional area of 200 mm, are screwed together using a union at B as shown. Originally the assembly is adjusted so that no load is an the pipe. If the union is then tightened so that its screw, having a lead of 0.55 mm, undergoes two full turns, determine the average normal stress developed in the pipe. Assume that the union at B and couplings at A and C are rigid. Neglect the size of the union. Note: The lead would cause the pipe, when unloaded, to shorten 055 mm when the union is rotated ane revolution. -09m- a6 m.

Q-1 Link-2, shown in the figure, is 30 mm wide, has 12 mm diameter bearings atthe ends, and is cut from low carbon steel bar having a minimum yield strength of190 MPa. The end-condition constants for link-2 are C = 1 and C = 1.2 for bucklingin and out of the drawing, respectively.a) Draw necessary and clear free-body diagrams to determine the reactions atthe supports and the load on both member-2 and member-3. b) Determine a suitable thickness for link-2, based on a design factor of safetyηD = 4, and considering a material having E = 207 GPa, and a minimum yieldstrength Sy = 350 MPa.c) Determine the stress and resulting factor of safety for each pin, and state yoursuggestions in case of design factors less than 4.