In the figure above, the diameter of pulleys C and D are given to be 600 mm and 400 mm, respectively.

T₁ = 1000 N₂ T₂ = 500 N and T3 = 1500 N. But in addition to the force on the pulleys, a compressive

axial force of 100 kN is acting on both ends of the shaft. The shaft is made from a brittle material with

an ultimate tensile strength sur that is half of its ultimate compressive strength suc. If desired n = 2 for

the shaft, find the minimum required Sut and Suc-

a. Use Maximum Normal Stress Theory

b. Use Brittle Coulomb-Mohr Theory

c. Use Modified Mohr Theory