A full quarter-circular fillet is used at the shoulder of a stepped shaft having diameter D2 = 1.0 in. (see figure). A torque T = 500 lb-in. acts on the shaft.
Determine the shear stress Tmax at the stress concentration for values as follows: D1 5 0.7, 0.8, and 0.9 in. Plot a graph showing Tmax versus D1.