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Research Papers: Design and Analysis

Experimental Investigation of Failure Estimation Method for Circumferentially Cracked Pipes Subjected to Combined Bending and Torsion Moments

[+] Author and Article Information
Yinsheng Li

Japan Nuclear Energy Safety Organization,
Tokai-mura, Naka-gun,
Ibaraki-ken 319-1195, Japan
e-mail: li.yinsheng@jaea.go.jp

Kunio Hasegawa

Japan Nuclear Energy Safety Organization,
Matsudo-cho 2-13-17, Hitachi Naka-shi,
Ibaraki-ken 312-0016, Japan
e-mail: kunioh@kzh.biglobe.ne.jp

Michiya Sakai

Central Research Institute of Electric Power Industry,
1646 Abiko, Abiko-shi,
Chiba 270-1194, Japan
e-mail: m-sakai@criepi.denken.or.jp

Shinichi Matsuura

Central Research Institute of Electric Power Industry,
1646 Abiko, Abiko-shi,
Chiba 270-1194, Japan
e-mail: matsuura@criepi.denken.or.jp

Naoki Miura

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

1Present address: Japan Atomic Energy Agency.

2Present address: KH Engineering Consultant Corp.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 21, 2013; final manuscript received May 7, 2014; published online October 15, 2014. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 137(2), 021202 (Oct 15, 2014) (7 pages) Paper No: PVT-13-1216; doi: 10.1115/1.4027640 History: Received December 21, 2013; Revised May 07, 2014

When a crack is detected in a nuclear piping system during in-service inspections, failure estimation method provided in codes such as ASME Boiler and Pressure Vessel Code Section XI or JSME Rules on Fitness-for-Service for Nuclear Power Plants can be applied to evaluate the structural integrity of the cracked pipe. In the current codes, the failure estimation method for circumferentially cracked pipes is applicable for both bending moment and axial force due to pressure. Torsion moment is not considered. Recently, two failure estimation methods for circumferentially cracked pipes subjected to combined bending and torsion moments were proposed based on analytical investigations on the limit load for cracked pipes. In this study, experimental investigation was conducted to confirm the applicability of the failure estimation method for cracked pipes subjected to bending and torsion moments. Experiments were carried out on 8-in. diameter Schedule 80 stainless steel pipes containing a circumferential surface crack. Based on the experimental results, the proposed failure estimation methods were confirmed to be applicable to cracked pipes subjected to combined bending and torsion moments.

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References

Figures

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Fig. 1

Nomenclature and stress distribution for a cracked pipe subjected to bending moment

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Fig. 2

A circumferentially cracked pipe subjected to combined bending and torsion moments

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Fig. 3

Pipe specimen used in failure experiment

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Fig. 4

Concept of experimental apparatus for combined bending and torsion moments

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Fig. 5

Photograph of experimental apparatus

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Fig. 6

Support and loading points and relative directions

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Fig. 7

Load–displacement curves for pipe specimens

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Fig. 8

Appearances of failed pipe specimens

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Fig. 9

Relationship between maximum bending moment and torsion moment using flow stress obtained from experiment

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Fig. 10

Relationship between maximum bending moment and torsion moment using flow stress defined in codes

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Fig. 11

Comparison of experimental and predicted moments

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