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Thin

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Submitted By noraini92
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Thin Cylinder

Summary/ Abstract

Thin-walled pressure vessel provides an important application of the analysis of plane stress. Since their walls offer litter resistance to bending, it may be assumed that the internal forces exerted on a given portion of wall are tangent to the surface of the vessel. The resulting stresses on an element of the wall will thus be contained in a plane tangent to the surface of the vessel. In this experiment, we are going to determine the circumferential stress under open condition, and analysis of combined axial and circumferential stress. We propose to determine the stresses exerted on a small element of wall with sides respectively parallel and perpendicular to the axis of the cylinder. Because of axis symmetry of the vessel and its contents, it is clear that no shearing stress is exerted on the element. It can be seen that all strains are used to calculate stress. As it is not possible to measure all strains, these have to be computed on the basis of marginal conditions. With this experiment it is not possible to measure in particular longitudinal strain in the body and radian strain perpendicular to the surface. Initial stress at the surface must be zero, longitudinal stress is constant over the radius are the marginal conditions to obtain the solution. The average E value we obtain from graph was 64 GN/m2. with the help of the computer, the Poisson’s ratio, v =0.35 and the principal strains for the thin cylinder were also calculated using formulas and the Mohr’s circle. For open ends conditions. The lower principal strains, εL1 = -191 με, which the upper principal strains, εH1 = principal strains, εL =
98.55 579.71

με. For closed ends conditions, the lower
484.05

με, which the upper principal strains εH =

με. We also

noted that there was errors occur during the experiment. The percentage error between the experiment result and the theoretical result is small for open ends condition but very large for closed ends condition .The...

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