The torsional assembly of Figure P6.73/74 consists of a cold-rolled stainless-steel tube connected to a solid cold-rolled brass segment at flange C. The assembly is securely fastened to rigid supports...

The torsional assembly of Figure P6.73/74 consists of a cold-rolled stainless-steel tube connected to a solid cold-rolled brass segment at flange C. The assembly is securely fastened to rigid supports at A and D. Stainless steel tubes (1) and (2) have an outside diameter of 3.50 in., a wall thickness of 0.120 in., a shear modulus of G = 12,500 ksi, and an allowable shear stress of 30 ksi. The solid brass segment (3) has a diameter of 2.00 in., a shear modulus of G = 5,600 ksi, and an allowable shear stress of 18 ksi. Determine the maximum permissible magnitude for the concentrated torque T_B.