A beam machined of 4340 steel has been oil quenched and tempered at 705°C.
(a) If the beam is subjected to a steady bending stress of 207 MPa and the factor of safety is 2. 0, is the part safe by the max shear stress theory of failure?
(b) If the beam is subjected to a cyclic load with σmax = 207 MPa and σmin = 177 MPa, Kf = 1.2 and the factor of safety is 2.0, is the part safe from failure by the Soderberg equation?
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