From Section 3–12, the maximum shear stress in a solid round bar of diameter, d, due to an applied torque, T, is given by A round, cold-drawn 1018 steel rod is subjected to a mean torsional load of with a standard deviation of 145 N • m. The rod material has a mean shear yield strength of with a standard deviation of 23.5 MPa. Assuming the strength and load have normal distributions, what value of the design factor corresponds to a reliability of 0.99 against yielding? Determine the corresponding diameter of the rod.
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