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Research Papers: Design and Analysis

Prediction Method for Plastic Collapse of Circumferentially Cracked Pipes Subjected to Combined Bending and Torsion Moments

[+] Author and Article Information
Yinsheng Li

Japan Nuclear Energy Safety Organization,
Toranomon 4-1-28, Minato-ku,
Tokyo 105-0001, Japan
e-mail: li-yinsheng@jnes.go.jp

Kunio Hasegawa

Japan Nuclear Energy Safety Organization,
Toranomon 4-1-28, Minato-ku,
Tokyo 105-0001, Japan
e-mail: hasegawa-kunio@jnes.go.jp

Phuong H. Hoang

Sargent & Lundy LLC,
55 e Monroe,
Chicago, IL 60603
e-mail: PHUONG.H.HOANG@sargentlundy.com

Bostjan Bezensek

Hunting Energy Services (UK) Ltd,
Portlethen, Aberdeen,
AB12 4YB, UK
e-mail: bostjan.bezensek@hunting-intl.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 30, 2011; final manuscript received March 18, 2012; published online October 18, 2012. Assoc. Editor: Douglas Scarth.

J. Pressure Vessel Technol 134(6), 061207 (Oct 18, 2012) (7 pages) doi:10.1115/1.4007032 History: Received May 30, 2011; Revised March 18, 2012

When a crack is detected in a pipe during in-service inspection, the failure estimation method given in the Codes such as the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code Section XI or the Japan Society of Mechanical Engineers (JSME) S NA-1-2008 can be applied to assess the integrity of the pipe. In the current edition of the ASME Code Section XI, the failure estimation method is provided for combined bending moment and pressure loads. The provision of evaluating torsion load is not made in the ASME Code Section XI. In this paper, finite element analyses are conducted for stainless steel pipes with a circumferential surface crack subjected to the combined bending and torsion moments, focusing on the entire range of torsion moments, including pure torsion. The effect of the internal pressure on failure behavior is also investigated. Based on the analysis results, a prediction method for plastic collapse under the combined loading conditions of bending and torsion is proposed for the general magnitude of torsion moments.

Copyright © 2012 by ASME
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References

Figures

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Fig. 1

The nomenclature and a schematic stress distribution for a pipe with a circumferential surface crack under remote bending

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Fig. 2

The model of a pipe subjected to bending and torsion moments used in the finite element analyses

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Fig. 3

The mesh of the finite element analysis model of a pipe with a circumferential surface crack with 2θ = 90 deg

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Fig. 4

Relationship between the bending moment and bending angle

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Fig. 5

The yielded region of the pipe (grey color) when the maximum bending moment is achieved in the case of τ/σf = 0.2

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Fig. 13

Relationship between the bending collapse moments and the collapse torsion moments when 2θ = 270 deg as a function of internal pressure

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Fig. 14

Relationship between the equivalent collapse moment and the collapse torsion moment in the presence of internal pressure

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Fig. 11

Values of the biaxial failure parameter r considering different loading sequences

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Fig. 10

Relationship between the collapse bending and torsion moments considering different loading sequences

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Fig. 9

Values of the biaxial failure parameter r for different analysis conditions

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Fig. 8

Relationship between the equivalent collapse moment and the collapse torsion moments

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Fig. 7

Relationship between the collapse bending moments and the collapse torsion moments

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Fig. 6

Relationship between the torsion moment and torsion angle

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Fig. 12

Relationship between the bending collapse moments and the collapse torsion moments when 2θ = 90 deg as a function of internal pressure

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Fig. 15

Relationship between the biaxial failure parameter r and shear stress due to torsion moment in the presence of internal pressure

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Fig. 16

Relationship between the collapse torsion moment and the crack angle when a/t = 0.5 in the presence of internal pressure

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