A beam machined of 8640 steel has been oil quenched and tempered at 425°C.
(c) If the beam is subjected to a steady bending stress of 550 MPa and the factor of safety is 2.0, is the part safe by the max shear stress theory of failure?
(d) If the beam is subjected to a cyclic load with σmax = 550 MPa and (σmin = 150 MPa, Kf = 1.2 and the factor of safety is 2.0, is the part safe from failure by the Goodman equations?
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