The cylindrical pressure vessel with closed ends has a diameter of 16 in. and a wall thickness of 3/4 in. The vessel carries simultaneously an internal pressure of 1200 psi, a torque of 90 kip · ft, and a bending moment of 30 kip · ft. The yield strength of the material is 40 ksi. What is the factor of safety against yielding according to the maximum shear stress theory?
