A pressurized steel tank is constructed with a helical weld that makes an angle a = 55° with the longitudinal axis (see figure). The tank has radius r = 0.6m, wall thickness t = 18mm, and internal pressure p = 2.8MPA. Also, the steel has modulus of elasticity E = 200GPA and Poisson's ratio = 0.30. Determine the following quantities for the cylindrical part of the tank. (a) The circumferential and longitudinal stresses. (b) The maximum in-plane and out-of-plane shear stresses. (c) The circumferential and longitudinal strains. (d) The normal and shear stresses acting on planes parallel and perpendicular to the weld (show these stresses on a properly oriented stress element). %3D Helical weld

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