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Research Papers: Design and Analysis

Experimental Investigation of Net-Section-Collapse Criterion for Circumferentially Cracked Cylinders Subjected to Torsional Moment

[+] Author and Article Information
Naoki Miura

Materials Science Research Laboratory,
Central Research Institute of Electric Power Industry,
2-6-1 Nagasaka,
Yokosuka-shi, Kanagawa 240-0196, Japan
e-mail: miura@criepi.denken.or.jp

Katsuaki Hoshino

Electric Power Engineering Systems Co., Ltd.,
2-11-1 Iwado-Kita,
Komae-shi, Tokyo 201-8511, Japan
e-mail: hoshinok@dts.dcc.co.jp

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

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 1, 2013; final manuscript received December 12, 2013; published online February 27, 2014. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 136(3), 031204 (Feb 27, 2014) (5 pages) Paper No: PVT-13-1076; doi: 10.1115/1.4026277 History: Received May 01, 2013; Revised December 12, 2013

When a crack-like-flaw is detected in piping during in-service inspection, the limit load criterion given in the codes such as JSME Rules on Fitness-for-Service for Nuclear Power Plants or ASME Boiler and Pressure Vessel Code Section XI can be applied to evaluate the structural integrity of the piping. However, in-service piping is generally subjected to combined tensile, bending, and torsional loading, and a methodology to evaluate the limit moment for torsion has not yet been established because of inadequate experimental validation. In this study, fracture tests were conducted for circumferentially cracked cylinders subjected to torsional moment. The experimental maximum moments were compared with the limit moments, which were evaluated on the basis of the net-section-collapse criterion for torsional moment. The maximum moments can be conservatively predicted by the net-section-collapse criterion.

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Figures

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Fig. 1

Moments acting on a pipe

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Fig. 2

Stress distribution of cracked section for torsional moment

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Fig. 3

Specimen for torsional fracture test

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Fig. 4

Experimental torsional moment-rotation angle: (a) uncracked specimens, (b) surface cracked specimens (a/t = 0.5), (c) surface cracked specimens (a/t = 0.75), and (d) through-wall cracked specimens

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Fig. 5

Effect of crack size on normalized maximum torsional moments

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Fig. 6

Effect of ligament area on normalized maximum torsional moments

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Fig. 7

Typical residual deformation of specimens (Type304): (a) uncracked specimens, (b) surface cracked specimens (a/t = 0.5), (c) surface cracked specimens (a/t = 0.75), and (d) through-wall cracked specimens

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