A hub is press fitted on a shaft. An element in the hub is subjected to a radial compressive stress of 50 N/mm2 and hoop stress of 75 N/mm2. If the hub is made Of 30C8 steel with yield strength, σy =350 N/mm2. What is the factor of safety using maximum shear stress theory?
(a) 2.8 (b) 3.6
(c) 4.2 (d) 5.6