Q6 A pressure tank is supported by two cradles as shown in Figure Q6. One of the cradles is designed so that it does not exert any longitudinal forces on the tank. The cylindrical body of the tank has 5.a m outer diameter and is fabricated from a 12 mm steel plate by butt welding along a helix that forms an angle of 4b° with transverse plane. The end caps are spherical and have a uniform wall thickness of 10 mm. The gage pressure is 1.c MPa. Parameter a, b, and c are given by: a = last digit of your matrix number b= fifth digit of your matrix number c = fourth digit of your matrix number For example, a student with the matrix number CD170987 will have the values of 5.a = 5.7, 4b = 48 and 1.c = 18. (a) Calculate the normal stress and the maximum shearing stress in the spherical caps. (b) Draw the Mohr's circle, solve the stress in directions perpendicular and parallel to the helical weld.

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