0
Research Papers: Design and Analysis

Prediction of Collapse Stress for Pipes With Arbitrary Multiple Circumferential Surface Flaws

[+] Author and Article Information
Yinsheng Li

Seismic Safety Division, Japan Nuclear Energy Safety Organization, Toranomon 4-3-20, Minato-ku, Tokyo 105-0001, Japanli-yinsheng@jnes.go.jp

Kunio Hasegawa

Nuclear Energy System Safety Division, Japan Nuclear Energy Safety Organization, Toranomon 3-7-11, Minato-ku, Tokyo 105-0001, Japanhasegawa-kunio@jnes.go.jp

Kunio Onizawa

Nuclear Safety Research Center, Japan Atomic Energy Agency, Shirakata-Shirane 2-4, Tokai, Ibaraki, 319-1195, Japanonizawa.kunio@jaea.go.jp

Nathaniel G. Cofie

 Structural Integrity Associates, 5215 Hellyer Avenue, Suite 210, San Jose, CA 95138ncofie@structint.com

J. Pressure Vessel Technol 132(6), 061204 (Oct 14, 2010) (7 pages) doi:10.1115/1.4001732 History: Received November 09, 2009; Revised April 20, 2010; Published October 14, 2010; Online October 14, 2010

When a flaw is detected in a stainless steel piping system of a nuclear power plant during in-service inspection, the limit load estimation method provided in codes such as ASME Section XI or JSME S NA-1-2008 can be applied to evaluate the integrity of the pipe. However, in the current editions of these codes, a limit load estimation method is only provided for pipes containing a single flaw. Independent multiple flaws, such as stress corrosion cracks, have actually been detected in the same plane of stainless steel piping systems. In this paper, a failure estimation method by formula is proposed for any number and arbitrary distribution of multiple independent circumferential flaws in the same plane of a pipe. Using the proposed method, numerical solutions are compared with experimental results to validate the model, and several numerical examples are provided to show its effectiveness.

FIGURES IN THIS ARTICLE
<>
Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Nomenclature and stress distribution of a pipe with a single surface flaw

Grahic Jump Location
Figure 2

Nomenclature and stress distribution of a pipe with two symmetrical independent flaws

Grahic Jump Location
Figure 3

Nomenclature and stress distribution of a pipe with three symmetrical independent flaws

Grahic Jump Location
Figure 4

Nomenclature and stress distribution of a pipe with multiple independent dissimilar surface flaws

Grahic Jump Location
Figure 5

Nomenclature of a pipe with multiple dissimilar surface flaws

Grahic Jump Location
Figure 6

Nomenclature of a flaw crossing over the neutral axis

Grahic Jump Location
Figure 7

Comparison the results between analyses and experiments for specimens with two symmetrical flaws

Grahic Jump Location
Figure 8

Multiple independent surface flaws and the corresponding combined flaw in a pipe: (a) the case where n is even, and the case where n is odd (b)

Grahic Jump Location
Figure 9

Relation between ratio of collapse stress and Interval angle between adjacent flaws for different flaw angles

Grahic Jump Location
Figure 10

Relation between ratio of collapse stresses and interval angle between adjacent flaws for different flaw depths

Grahic Jump Location
Figure 11

Relation between collapse stresses and combined flaw angles for different flaw numbers

Grahic Jump Location
Figure 12

Nomenclature of a pipe with two nonsymmetrical flaws

Grahic Jump Location
Figure 13

Solutions of rotation angle of the coordinates for different ratios of flaw depth and flaw angles

Grahic Jump Location
Figure 14

Solutions of the collapse stress for different ratios of flaw depth and flaw angles

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In