Diagram shows a shaft with brass segment A B of length 1800 millimeters which is connected to aluminum segment B C of length 800 millimeter using a flange at B and a torque T of 50 Newton meter is applied on C. The x axis is taken along the axis of the cylinders and the y axis is taken along the rigid support at A and perpendicular to the x axis.

If the diameter of segment (2)  is less than 27.2 mm , segment (2)  will twist too much, which will cause C  to rotate more than 3°  relative to support A .


Finished