(Answered): 4-5. The composite shaft shown in the Figure 5 is manufactured by shrink-fitting a steel sleeve ove ...

4-5. The composite shaft shown in the Figure 5 is manufactured by shrink-fitting a steel sleeve over a brass core so that the two parts act as a single solid bar in torsion. The outer diameters of the two parts are d,- 40 mm for the brass core and d2 50 mm for the steel sleeve. The shear moduli of elasticity are Gb 36 GPa for the brass and G 80 GPa for the steel. a) Assuming that the allowable shear stresses in the brass and steel are ?,-48 MPa and ? 80 MPa, respectively, determine the maximum permissible torque Tmax that may be applied to the shaft. b) If the applied torque T 2500 kN m, find the required diameter d2 so that allowable shear stress ?, is reached in the steel. Steel sleeve Brass core di d2 Figure 5