13.14 (B). A hollow shaft is 460 mm inside diameter and 25 mm thick. It is subjected to an internal pressure of 2MN/m², a bending moment of 25 kN m and a torque of 40 kN m. Assuming the shaft may be treated as a thin cylinder, make a neat sketch of an element of the shaft, showing the stresses resulting from all three actions. Determine the values of the principal stresses and the maximum shear stress. [21.5, 11.8, 16.6 MN/m².]