A closed cylindrical tube (thin-walled pressure vessel) with a diameter of 250 mm and a wall thickness of 5 mm is subjected to an internal pressure of P = 3 MPa and a torque of T = 15 kN about its axis.
a) Determine the maximum hoop stress and the axial stress on the cylinder.
b) Draw the original stress element with normal and shear forces labeled correctly.
c) Construct Mohr's Circle.
d) Determine the principal stresses and the maximum shear stress, along with the orientation of the plane at which they occur (show them on properly oriented stress elements).