4.6 The stresses induced at a critical point in a machine component made of steel 45C8 (Sy 380 N/mm²) are as follows: σ = 100 N/mm² σ = 40 N/mm² 80 N/mm² Txy Calculate the factor of safety by (i) the maximum normal stress theory, (ii) the maximum shear stress theory, and (iii) the distortion energy theory. [(i) 2.44 (ii) 2.22 (iii) 2.32] R = 4t 4.9