Diagram shows a shaft A B with aluminum segment marked 1 of length 400 millimeters inside which is a brass shaft marked 2. Both the shafts are centered on the central axis x. A torque T is applied at B.

Having determined τ1 and τ2, the internal torques carried by each shaft can be computed.

For shaft (1):

T1=τ1J1c1   =(81.45 N/mm2)(308,102 mm4)25 mm   =1,003,796 N-mm=1,003.8 N-m