The torsional assembly shown in Figure consists of a solid bronze (GB= 45 GPa)shaftCD and hollow aluminium alloy(GA=28 GPa) shaft EF that has a steel (Gs=80 GPa) core.The ends C and F are fixed to rigid walls, and the steel core of the shaft EF is connected to the flanges at E so that the aluminium and steel parts act as a unit.
The two flanges D and E are bolted together and the bolt clearance permits flange D to rotate through 0.03 rad before EF carries any of the load. Determine the maximum shearing stress in each of the shaft materials when the torque T= 54 kN.m is applied to flange D.