A Parametric Finite Element Geometric Analysis of a Pressurized Sphere with Cylindrical Flush Nozzle Outlet

[+] Author and Article Information
Murat Makaraci

Department of Mechanical Engineering, Engineering Faculty, Kocaeli University, Veziroglu Campus, 41040 Izmit, Kocaeli, Turkeymmakaraci@kocaeli.edu.tr

J. Pressure Vessel Technol 127(4), 369-372 (Jun 01, 2005) (4 pages) doi:10.1115/1.2042472 History: Received April 24, 2004; Revised June 01, 2005

A spherical, internally pressurized vessel with cylindrical flush nozzle outlet is analyzed in a parametric, linear displacement based finite element scheme. Geometric effects of outer convex radius design on the whole vessel body are investigated. An inside sharp corner where spherical section is joined with the flush nozzle outlet contributes to stress as well as degree of curvature in the outer convex radius. Stress and deformation states exhibit material, geometry, and internal pressure level dependencies. An important feature of the method, mesh convergence, is also validated for reliability of the results. Severe stress distributions and strain accumulations can be reduced through controlling outer geometric parameters. Materials having diverse mechanical properties such as carbon steel, Ti-Al-V alloy, near-eutectic Sn63-Pb37 solder alloy, and Nylon 66 are used for the vessel structure to reveal material dependence. Lower order elements are recommended for computational analysis.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

2D Sketch of the quarter model of the spherical vessel with flush nozzle having outer radius (units in mm)

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Figure 2

Stress convergence: Variation of inner Von Mises stress with dimensionless radius for carbon steel vessel at 100MPa internal pressure

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Figure 3

Strain convergence: Variation of inner strain at point A with dimensionless radius for carbon steel vessel at 100MPa internal pressure

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Figure 4

Stress distribution along thickness with R2=24mm; vessel made from carbon steel

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Figure 5

Effect of outer radius with internal pressure level; vessel made from carbon steel

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Figure 6

Effect of different element types; vessel made from carbon steel with Pint=100MPa

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Figure 7

Effect of material type on stress variation; Pint=100MPa

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Figure 8

Material dependence on strain variation, Pint=100MPa




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