The rotating stepped shaft in the figure is produced from 85080M30 steel by machining method. It works at ambient temperature. If the force applied to the shaft is given as P=10 kN as constant, calculate the diameter d for the shaft to have an infinite life.(f=0.9) (Sut=600MPa)

Question 4: A machine of 540 kg is bolted at the middle of two parallel simply supported steel beams. The clear span of the beam is 2.4 m. The moment of inertia of the cross-section of each beam is I = 4.2×10¯6 mª. The Young's modulus of the steel is E 200 GPa. When the machine is operating, it will generate a vertical force P(t)=Posinot. When the machine runs at 300 rpm, Po= 1500 N. Neglect the weight of the beams and assume 2% viscous damping in the system. Determine the amplitude of steady-state deflection of the beams at their midpoint when the machine runs at 300 rpm. machine 1.2 m = 1.2 m Steel beams

A compound shaft consisting of a bronze segment and an aluminum segment is acted upon by two torques as shown in figure 2. Solve to determine the uniform shaft diameter subject to the following conditions: tbr < 80 MPa, Tal < 55 MPa and the angle of rotation of the free end is limited to 6°. For Bronze, G = 35 GPa and for aluminum, G = 28 GPa.

Determine the reactions at the supports. Assume the support at A is fixed and that at B is a roller. Take E = 29x103 ksi. The Moment of inertia of each segment is shown in the figure. (By Using The Force Method) A 9 ft- IAB 30 k = 600 in 18 ft B 30 k IBC= 300 in | C 12 ft-