A pressurized container as shown in Figure 3 is constructed from a long, narrow aluminium plate by wrapping the plate around a mandrel and then welding along the edges of the plate to make a helical joint. The helical weld makes an angle = 60. The aluminium plate has Modulus Young of 70 GPa and Poisson's ratio of 0.3. The pressurized container is subjected to an internal pressure of 2MPa and a torsional moment of 20 kNm. Figure 3 With the outer diameter D = 500mm and inner diameter d = 496mm, a) determine the stress states at point B; Section A-A b) determine the Von Mises stress at point B ; c) sketch a Mohr's circle to indicate the key stresses such as principal stresses and maximum shear stresses (both in-plane and out-of-plane). d) determine the stresses that are perpendicular to and parallel with the seam. e) use the Mohr's circle in c) to verify the answer in d).