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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

## Abstract

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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## Figures

Figure 1

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

Figure 2

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

Figure 3

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

Figure 4

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

Figure 5

SCF as a function of d for α=15deg

Figure 6

SCF as a function of d for α=30deg

Figure 7

SCF as a function of d for α=45deg

Figure 8

SCF as a function of d for α=60deg

Figure 9

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

Figure 10

Relative stress amplification as a function of crosshole obliquity

## Errata

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