EAS3434 Aero Struc I Ch02 (2018 09 18) (1).pptx

# EAS3434 Aero Struc I Ch02 (2018 09 18) (1).pptx - Chap 2...

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Chap. 2: Membrane stresses in pressure vessels (4 hrs) Thin cylinders under internal pressure Thin spherical shell under internal pressure Vessels subjected to fluid pressure 1

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2 2. Learning Outcomes At the end of this chapter, we should be able to:- Tell type of stresses in pressure vessels. Express how pressure cause stresses and change of dimensions in pressure vessels. Explain the reason why additional amount of fluid must be pumped into a vessel to increase its pressure to a desired level.
3 2. Pressure vessels The pressure vessels commonly used in industrial applications consist basically of a few closed shells of simple shape: spherical or cylindrical with hemispherical, conical, ellipsoidal, or flat ends. The shell components are joined together mostly by welding and riveting; sometimes they are bolted together using flanges. In practice, the shell is considered thin if the wall thickness t is small in comparison with the circumferential radius of curvature R θ and the longitudinal radius of curvature R l . If the ratio R θ /t > 10, the shell is considered to be thin shell. This implies that the stresses developed in the shell wall by external loads can be considered to be uniformly distributed over the wall thickness. The shell thickness is designed to keep the maximum stresses below the yield strength of the material.

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