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Research Papers: Design and Analysis

Capacity Analysis and Safety Assessment of Polyethylene Pipeline With Local Wall-Thinning Defect

[+] Author and Article Information
Weijie Jiang

School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 211816, China
e-mail: jwjsos@hotmail.com

Jianping Zhao

School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 211816, China
e-mail: jpzhao@njtech.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 15, 2013; final manuscript received April 20, 2015; published online May 20, 2015. Assoc. Editor: Pierre Mertiny.

J. Pressure Vessel Technol 137(6), 061203 (Dec 01, 2015) (7 pages) Paper No: PVT-13-1181; doi: 10.1115/1.4030427 History: Received October 15, 2013; Revised April 20, 2015; Online May 20, 2015

The purpose of this study is to propose a safety assessment procedure for polyethylene (PE) pipe with local wall-thinning defect. A uniaxial tensile test is performed to test the mechanical performance of PE. Then, the constitutive model for PE can be established. The limit load of the PE pipe with local wall-thinning defect can be studied with the method of combining the orthogonal design of experiment and finite element (FE) analysis. Then, the factors of local wall-thinning defect can be analyzed. The results show that the depth of the defect has a great effect on the limit load (internal pressure and bending moment) of PE pipe. The effects that the axial length of the defect and the circumferential length of the defect have on the limit load are not significant. Referring to the safety assessment of metal pipe proposed by GB/T19624-2004, a safety assessment for PE pipe with local wall-thinning defect is revised.

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References

Figures

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Fig. 1

The engineering stress–strain curves of PE80

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Fig. 2

Relationship between the yield stress and tensile strain rate of PE80

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Fig. 3

Parameters fitting of PE80

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Fig. 4

Geometry of PE pipe with local wall-thinning defect

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Fig. 5

FE model with boundary conditions

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Fig. 7

Strain contours of PE pipe under combined loads

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Fig. 8

Twice elastic slope criterion

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Fig. 9

Process of bending test

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Fig. 10

Condition of Test No. 5 after bending experiment

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Fig. 11

Safety assessment curve of metallic material

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Fig. 12

Limit load curve of PE80

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Fig. 13

Comparison of the safety assessment diagrams

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