1.The cylindrical bearing journal of a straddle-mounted crankshaft has been tentatively sized based on wear requirements, and it has been found that a diameter of 1.38 inches is required for this purpose. A force analysis of the journal at the critical cross section has shown there to be a transverse shear force of 8500 lb, torsional moment of 7500 in-lb, and bending moment of 6500 in-lb. If the governing failure mode is fatigue, and the design stress based on fatigue has been found to be 40,000 psi, calculate whether the 1.38-inch-diameter journal is properly designed to safely withstand the fatigue loading.
