A hot-rolled steel has a yield strength of Sy = Syc = 100 kpsi and a true strain at fracture of ɛf = 0.55. Estimate the factor of safety for the following principal stress states: |(a) ox = 70 kpsi, ơy |(b) ơ : |(c) Ox = 0 kpsi, ơy = 40 kpsi, Txy = |(d) ox = -40 kpsi, ơy = -60 kpsi, txy = 15 kpsi |(e) 01 = 30 kpsi, o2 = 30 kpsi, 03 = 30 kpsi 70 kpsi, txy 0 kpsi = 60 kpsi, ơy = 40 kpsi, txy =-15 kpsi 45 kpsi %3D

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A steel component is subjected to alternate cyclical loading. The steel follows Basquin's law for high cycle fatigue, o, x N = C, (where the stress amplitude is in MPa). Ignore the geometric detail and assume that Marin's modifying factors are all equal to 1. You are given the minimum stress ain = -213 MPa, the maximum stress omax = 213 MPa. The material data are Tensile strength oUTS = 539 MPa, Basquin's constant c, = 875 MPa, Basquin's exponent a = 0.085. a) Calculate the stress ratio R, the stress amplitude o, in MPa and the mean stress am in MPa. The answers are acceptable with a tolerance of 0.01 for R and of 1 MPa the stresses. R: MPa MPа b) Calculate the corresponding life, in 10° cycles, (tolerance of 0.1 106 cycles) N :

Which of the following parameter represents principal stresses: T_a none of the available option O_X O_y 0_a