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Research Papers: Design and Analysis

Elastic Behavior of Cylindrical Vessels With Lateral Nozzle Under Internal Pressure

[+] Author and Article Information
P. Gao, Z. F. Sang

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China

N. Li

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China; State Power Environmental Protection Research Institute, Nanjing 210031, China

G. E. O. Widera

Center for Joining and Manufacturing Assembly, Marquette University, Milwaukee, WI 53201

J. Pressure Vessel Technol 131(5), 051207 (Sep 03, 2009) (6 pages) doi:10.1115/1.3148184 History: Received May 06, 2008; Revised September 12, 2008; Published September 03, 2009

The objective of this work is to study the elastic stress distribution, deformation characteristic, and stress concentration factor (SCF) of a cylindrical vessel with lateral nozzle. Three full scale vessels under internal pressure with different geometric dimensions and lateral angle θ(θ=30deg,45deg,60deg) are investigated by both experimental and three-dimensional finite element methods under internal pressure. A detailed stress distribution and the SCFs of the model vessels are provided. The results indicate that the maximum stress of cylindrical vessels with a lateral nozzle occurs at the acute side of the cylinder-lateral intersection and drifts off the longitudinal section of the cylinder for about 20 deg. When the geometric parameters of the vessels (d/D,D/T,t/T) are fixed, the SCF of the structure will increase with a decrease in the lateral angle θ.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of experimental models

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Figure 2

Details of the welds (dimension in millimeters)

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Figure 3

Locations of strain gauges for experimental vessel No. 1

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Figure 4

Photograph of vessel No. 2 during the test

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Figure 5

Stress distribution from experiment for model 1(θ=60 deg) under 1.5 MPa. (a) Stresses in longitudinal section of cylinder on acute side; (b) stresses in longitudinal section of cylinder on obtuse side; (c) stresses in transverse section of cylinder; and (d) stress distributions in connection area.

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Figure 6

Finite element mesh of model1

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Figure 7

Deformation of the elastic area of model 2 under 1.0 MPa (MPa, scale=250)

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Figure 8

FEM stress distributions for model 1 (θ=60 deg) under 1.5 MPa. (a) Stresses in longitudinal section of cylinder on acute side; (b) stresses in longitudinal section of cylinder on obtuse side; (c) stresses in transverse section of cylinder; and (d) stress distributions in connection area.

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Figure 10

Location of actual burst failure for test vessels

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Figure 9

Influence of lateral angle θ on SCF (on acute side of cylinder)

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