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Technical Brief

Stress–Strain Analysis of a Pipeline With Inner and Outer Corrosion Defects

[+] Author and Article Information
Zheng Liang, Yao Xiao

School of Mechatronic Engineering,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China

Jie Zhang

School of Mechatronic Engineering,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China;
Key Laboratory of Efficient Utilization of Low and
Medium Grade Energy (Tianjin University),
Ministry of Education of China,
Tianjin University,
Tianjin 300072, China
e-mail: longmenshao@163.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 28, 2017; final manuscript received August 31, 2018; published online November 13, 2018. Assoc. Editor: Kiminobu Hojo.

J. Pressure Vessel Technol 140(6), 064501 (Nov 13, 2018) (6 pages) Paper No: PVT-17-1269; doi: 10.1115/1.4041434 History: Received December 28, 2017; Revised August 31, 2018

A numerical simulation method is adopted to analyze the effects of three types of defect geometries ((1) a single defect on the inner surface, (2) a single defect on the outer surface, and (3) double coaxial defects on the inner surface and the outer surface.) on the residual strength of corroded X60 steel pipelines and equivalent stress and plastic strain distribution of the local defect area. The results show that the defect geometry exerts obvious effects on stress–strain distribution. The earliest plastic deformation occurs at the edge of the inner surface defect (type 1), but it occurs on the central part of both the outer surface defect (type 2) and the double defects (type 3). The appearance of defects greatly weakens the stability of the pipeline. For equivalent sum total corrosion defect depth, a single defect is more harmful to the pipeline than double defects.

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Copyright © 2018 by ASME
Topics: Stress , Corrosion , Pipelines
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Figures

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Fig. 1

Different circular corrosion defect models of pipeline: (a) inner defect, (b) outer defect (type 2), (c) double defects (type 3), and (d) nomenclature of axes

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Fig. 2

Von Mises stress distribution of the inner corroded area under different inner pressures

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Fig. 3

Equivalent stress–strain nephrogram of the inner defect area: (a) von Mises stress and (b) plastic strain

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Fig. 4

Von Mises stress distribution of the outer corroded area under different inner pressures

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Fig. 5

Equivalent stress–strain nephrogram of the outer defect area: (a) von Mises stress and (b) plastic strain

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Fig. 6

The equivalent stress–strain nephrogram of the double defects area. (a) Von Mises stress and (b) equivalent plastic strain.

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Fig. 7

The equivalent stress–strain nephrogram of the inner and outer surfaces of the double defects: (a) local equivalent stress and (b) local plastic strain

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Fig. 8

The equivalent stress–strain of the pipeline X60 with different defects with internal pressure: (a) the equivalent stress and (b) the plastic strain

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Fig. 9

Local equivalent stress–strain of the inner and outer surfaces in the different defects: (a) local equivalent stress and (b) local plastic strain

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