Research Papers: Design and Analysis

Failure Experiments on Pipes With Local Wall Thinning Subjected to Multi-Axial Loads

[+] Author and Article Information
Yinsheng Li

Japan Atomic Energy Agency (JAEA),
Tokai-mura, Naka-gun,
Ibaraki-ken 319-1195, Japan
e-mail: li.yinsheng@jaea.go.jp

Kunio Hasegawa

Japan Atomic Energy Agency (JAEA),
Tokai-mura, Naka-gun,
Ibaraki-ken 319-1195, Japan
e-mail: kunioh@kzh.biglobe.ne.jp

Naoki Miura

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

Katsuaki Hoshino

Electric Power Engineering Systems Co., Ltd.,
2-6-1 Nagasaka, Yokosuka,
Kanagawa 240-0196, Japan
e-mail: hoshinok@dentec.co.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 26, 2016; final manuscript received May 23, 2016; published online September 27, 2016. Assoc. Editor: Reza Adibiasl.

J. Pressure Vessel Technol 139(2), 021203 (Sep 27, 2016) (7 pages) Paper No: PVT-16-1031; doi: 10.1115/1.4033730 History: Received February 26, 2016; Revised May 23, 2016

Piping lines in nuclear power plants may experience multi-axial loads including tensile force, bending, and torsion moments during operation. There is a lack of guidance for failure evaluation of locally wall-thinned pipes under the multi-axial loads including torsion moment. The ASME B&PV Code Section XI Working Group is currently developing fully plastic failure evaluation procedures for pressurized piping items containing local wall thinning subjected to multi-axial loads. A failure estimation method for locally wall-thinned pipes subjected to multi-axial loads including torsion moment has been proposed through numerical analyses. In this study, in order to investigate the failure behavior of the pipes with local wall thinning subjected to multi-axial loads including the torsion, failure experiments were performed on 20 mm diameter carbon steel pipes with a local wall thinning. Based on the experimental results, the proposed failure estimation method is confirmed to be applicable to pipes with local wall thinning.

Copyright © 2017 by ASME
Topics: Stress , Pipes , Failure , Torsion
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Fig. 1

Nomenclature and stress distribution for a locally wall-thinned pipe subjected to bending moment

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Fig. 2

A locally wall-thinned pipe subjected to multi-axial loads

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Fig. 3

Applicable area of failure evaluation method for pipe with local wall thinning: applicable area of (a) local wall-thinning depth and length, and (b) depth and angle

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Fig. 4

Small size pipe specimen used in experiments: (a) longitudinal view of specimen, (b) wall thinning in central section, and (c) wall thinning in longitudinal direction

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Fig. 5

Concept of experimental method for pipe subjected to multi-axial loads: (a) description of experimental concept and (b) description of dimensions and loading condition

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Fig. 6

Load components in (a) y–z and (b) x–y planes

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Fig. 7

Pipe specimen with jigs for combined axial load, bending, and torsion moments (rM = 1.0): (a) general view, (b) cross section of link A, (c) specimen and link B, and (d) pipe specimen with jigs

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Fig. 8

Photograph of tensile testing apparatus

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Fig. 9

Relationships between tensile load and axial displacement: (a) a/t = 0.5 and 2θ = 90 deg and (b) a/t = 0.5 and 2θ = 120 deg

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Fig. 10

Appearance of some failed specimens

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Fig. 11

Ratios of experimental failure load to predicted failure load




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