Stress Classification Using the r-Node Method

[+] Author and Article Information
Ihab F. Fanous

 Atomic Energy of Canada Ltd., 2251 Speakman Drive, Mississauga, ON-L5K 1B2, Canada

R. Seshadri

Faculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland A1B 3X5, Canada

J. Pressure Vessel Technol 129(4), 676-682 (Jun 28, 2006) (7 pages) doi:10.1115/1.2767357 History: Received March 04, 2006; Revised June 28, 2006

The ASME Code Secs. III and VIII (Division 2) provide stress-classification guidelines to interpret the results of a linear elastic finite element analysis. These guidelines enable the splitting of the generated stresses into primary, secondary, and peak. The code gives some examples to explain the suggested procedures. Although these examples may reflect a wide range of applications in the field of pressure vessel and piping, the guidelines are difficult to use with complex geometries. In this paper, the r-node method is used to investigate the primary stresses and their locations in both simple and complex geometries. The method is verified using the plane beam and axisymmetric torispherical head. Also, the method is applied to analyze 3D straight and oblique nozzles modeled using both solid and shell elements. The results of the analysis of the oblique nozzle are compared with recently published experimental data.

Copyright © 2007 by American Society of Mechanical Engineers
Topics: Stress , Stress , Membranes , Shells , Design
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Figure 1

Results of stress analysis (9)

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Figure 2

Coordinates of cross section

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Figure 4

Bending stress distribution of the initial elastic and redistribution analyses

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Figure 5

Membrane plus bending stress distribution of the initial elastic and redistribution analyses

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Figure 6

Schematic diagram of the indeterminate beam

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Figure 7

Primary stress distribution along the beam

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Figure 8

Primary stress for combined membrane and bending load

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Figure 9

Schematic of the geometry with the expected hinge locations

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Figure 10

Primary stress distribution along the vessel wall

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Figure 11

Schematic diagram of the straight nozzle

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Figure 12

Schematic diagram of the oblique nozzle as modeled by Sang (13)




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