A stepped shaft having solid circular parts with diameters D and d is in pure torsion (F...

A stepped shaft having solid circular parts with diameters D and d is in pure torsion (Fig. P6.12). The two parts are joined with a fillet of radius r (see Fig.D.4). If the shaft is made of brass with allowable shear strength 80 MPa, determine the largest torque capacity of the shaft. Given: D = 100 mm, d = 50 mm, r = 10 mm.