A hot-rolled steel has a yield strength of S= S,= 100 kpsi and a true strain at fracture of &= 0.55. Estimate the factor of safety for the following principal stress states: (a) o.= 70 kpsi, o, = 70...

Extracted text: A hot-rolled steel has a yield strength of S= S,= 100 kpsi and a true strain at fracture of &= 0.55. Estimate the factor of safety for the following principal stress states: (a) o.= 70 kpsi, o, = 70 kpsi, t, = 0 kpsi (b) o. = 60 kpsi, o, = 40 kpsi, ty = -15 kpsi (c) 0.= 0 kpsi, o, = 40 kpsi, ty = 45 kpsi (d) 0.= -40 kpsi, o, = -60 kpsi, Ty = 15 kpsi (e) o = 30 kpsi, ơ: = 30 kpsi, os = 30 kpsi !3! %3!