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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

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