2) The composite shaft shown consists of a 5mm thick -ket (Gbrass = 39 GPa) bonded to a 40 mm diameter steel core (Gmez = 77.2 GPa). The allowable shear stress of the brass jacket is 20 MPa, and the allowable shear stress of the steel core is 45 MPa. Determine (a) the largest torque that can be applied to the shaft, and (b) the angle of twist of A relative to B. (Hint use each allowable stress to calculate a twist value; choose the \"proper\" twist value, then use this twist to 40 mm/ calculate T.) Ans. T = 687.7 Nm , at = 235 5 mm Brass jacket Steel core