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Design and Analysis

Effects of Torsion on Equivalent Bending Moment for Limit Load and EPFM Circumferential Pipe Flaw Evaluations

[+] Author and Article Information
Phuong H. Hoang

Sargent & Lundy LLC,
55 East Monroe Street,
Chicago, IL 60603
e-mail: phuong.h.hoang@sargentlundy.com

Kunio Hasegawa

Japan Nuclear Energy Safety
Organization (JNES),
Toranomon 3–17-1, Minato-ku,
Tokyo 105-0001, Japan
e-mail: hasegawa-kunio@jnes.go.jp

Bostjan Bezensek

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

Yinsheng Li

Japan Nuclear Energy Safety
Organization (JNES),
Toranomon 4-3-20, Minato-ku,
Tokyo 105-0001, Japan
e-mail: li-yinsheng@jnes.go.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 15, 2011; final manuscript received February 20, 2012; published online October 18, 2012. Assoc. Editor: Douglas Scarth.

J. Pressure Vessel Technol 134(6), 061206 (Oct 18, 2012) (8 pages) doi:10.1115/1.4006559 History: Received March 15, 2011; Revised February 20, 2012

The circumferential flaw evaluation procedures in ASME Boiler and Pressure Vessel Code Section XI nonmandatory Appendix C are currently limited to straight pipes under pressure and bending loads without consideration of torsion loading. The Working Group on Pipe Flaw Evaluation of the ASME Boiler and Pressure Vessel Code is developing guidance for considering the effects of torsion by a mean of an equivalent bending moment, which is a square root of sum square combination of bending moment and torsion load with a weighted factor for torsion moment. A torsion weighted factor, Ce, is established in this paper using large strain finite element limit load analysis with elastic perfectly plastic materials. Planar flaws and nonplanar flaws in a 10.75 in. (273 mm) OD pipe are investigated. Additionally, a finite element J-integral calculation is performed for a planar through wall circumferential flaw with elastic plastic materials subjected to bending and torsion load combinations. The proposed Ce factor for planar flaws is intended for use with the ASME B&PV Code Section XI, Appendix C for limit load and Elastic Plastic Fracture Mechanics (EPFM) circumferential planar flaw evaluations.

Copyright © 2012 by ASME
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References

Figures

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Fig. 1

Section XI, Appendix C planar circumferential flaw characterization

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Fig. 2

Section XI, Code Case N-597 nonplanar flaw characterization

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Fig. 3

A half of the model of 45-deg circumferential planar flaw

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Fig. 4

Boundary conditions for planar circumferential flaw model

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Fig. 5

Typical bending moment versus rotation

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Fig. 6

Von Mises stress in 45-deg circumferential planar flaw model at limit load with 0.2 Sf shear stress and no internal pressure

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Fig. 7

Von Mises stress distribution on cracked surface of 45-deg circumferential planar flaw model at limit load with 0.2 Sf shear stress and no internal pressure

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Fig. 8

Shear stress distribution in 45-deg circumferential planar flaw model at limit load and no internal pressure

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Fig. 9

Shear stress distribution in 45-deg circumferential planar flaw model in elastic range and no internal pressure

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Fig. 10

A half of the model of 45-deg circumferential nonplanar flaw

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Fig. 11

A half of the model of 45-deg circumferential nonplanar flaw

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Fig. 12

Von Mises stress distribution in 45-deg circumferential nonplanar flaw model at limit load with 0.2 Sf shear stress and no internal pressure

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Fig. 13

Shear stress distribution in 45-deg circumferential nonplanar flaw model at limit load and no internal pressure

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Fig. 14

Shear stress distribution in 45-deg circumferential nonplanar flaw model in elastic range and no internal pressure

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Fig. 15

J-Integral model of 45-deg through wall circumferential planar flaw

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Fig. 16

A half of the J-integral model of 45-deg through wall circumferential planar flaw

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Fig. 17

J-integral versus bending moment plus torsion

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