Research Papers: Materials and Fabrication

Experimental Investigation of Failure Estimation Method for Stainless Steel Pipes With a Circumferential Crack Subjected to Combined Tensile and Torsion Loads

[+] Author and Article Information
Yinsheng Li

e-mail: li-yinsheng@jnes.go.jp

Kunio Hasegawa

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

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

Katsuaki Hoshino

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

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received December 4, 2012; final manuscript received February 11, 2013; published online June 11, 2013. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 135(4), 041405 (Jun 11, 2013) (8 pages) Paper No: PVT-12-1186; doi: 10.1115/1.4023735 History: Received December 04, 2012; Revised February 11, 2013

When a crack is detected in a stainless steel pipe during in-service inspections, the failure estimation method given in codes such as the 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 includes the bending moment and tensile force due to pressure. The torsion moment is assumed to be relatively small and is not considered. Recently, analytical investigations considering multiaxial loads including torsion were conducted in several previous studies by examining the limit load for pipes with a circumferential crack. A failure estimation method for the combined bending moment, torsion moment, and internal pressure was proposed. In this study, the failure behavior of pipes with a circumferential crack subjected to multiaxial loads including the torsion is investigated to provide experimental support for the failure estimation method. Experiments were carried out on small size stainless steel cylinders containing a circumferential surface or through-wall crack, subjected to the combined tensile load and torsion moment. Based on the experimental results, the proposed failure estimation method was confirmed to be applicable to cracked pipes subjected to combined tensile and torsion loads.

Copyright © 2013 by ASME
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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 pipe containing a circumferential crack subjected to bending and torsion moments

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Fig. 3

Specimen used in failure experiments

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Fig. 4

Photograph of axial-torsion hydraulic servo testing apparatus

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Fig. 5

Experimental results for specimens with a small angle crack

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Fig. 6

Experimental results for specimens with a large angle crack

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Fig. 7

Experimental results in the cases of pure torsion loading

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Fig. 8

Appearances of failed specimens with a/t = 0.5 and 2θ = 30 deg

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Fig. 9

Appearances of failed specimens with a/t = 0.5 and 2θ = 120 deg

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Fig. 10

Relationships between maximum tensile loads and torsion moments

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Fig. 11

Relationship between normalized maximum tensile loads and torsion moments




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