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Research Papers: Design and Analysis

Stress Concentration Factors for Oblique Holes in Pressurized Thick-Walled Cylinders

[+] Author and Article Information
Gérard C. Nihous1

Hawaii Natural Energy Institute, University of Hawaii, 1680 East-West Road, Post 109, Honolulu, HI 96822nihous@hawaii.edu

Christopher K. Kinoshita, Stephen M. Masutani

Hawaii Natural Energy Institute, University of Hawaii, 1680 East-West Road, Post 109, Honolulu, HI 96822

Plate thickness becomes the reference length in defining geometric similarity between the cases.

1

Corresponding author.

J. Pressure Vessel Technol 130(2), 021202 (Mar 17, 2008) (7 pages) doi:10.1115/1.2891915 History: Received August 03, 2007; Revised October 24, 2007; Published March 17, 2008

Elastic stress concentration factors (SCFs) for internally pressurized thick cylindrical vessels with oblique circular crossholes are reported. Results of finite-element analyses for two wall ratios (k equal to 2.25 and 4.5) and a range of crosshole ratios (d from 0.1 to 0.5) show that SCFs sharply increase with the inclination α of the crosshole axis. These findings are consistent with earlier empirical design guidelines based on experimental investigations.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 10

Relative stress amplification as a function of crosshole obliquity

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Figure 9

Location of maximum stress (in circle) for k=2.25 and d=0.2 (FEMLAB plots)

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Figure 8

SCF as a function of d for α=60deg

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Figure 7

SCF as a function of d for α=45deg

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Figure 6

SCF as a function of d for α=30deg

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Figure 5

SCF as a function of d for α=15deg

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Figure 4

Overview of SCF calculations as a function of d for k=4.5

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Figure 3

Overview of SCF calculations as a function of d for k=2.25

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Figure 2

SCF as a function of d for normal (radial) circular crossholes

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Figure 1

Sample geometry and mesh (global and detail): FEMLAB , k=4.5, d=0.3, α=45deg

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