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 (2):

T2=τ2J2c2   =(100 N/mm2)(225,968 mm4)21 mm   =1,076,038 N-mm=1,076.0 N-m