material property used for designing the shaft

Question

A solid circular shaft of diameter d is subjected to a combined bending moment, M and torque, T. The material property to be used for designing the shaft using the relation is 

(a) Ultimate tensile strength (Su)

(b) Tensile yield strength (Sy)

(c) Torsional yield strength (Ssy)

(d) Endurance strength (Se)

Answer 1

Given a solid circular shaft subjected to a combined bending moment M and torque T,