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Technical Brief

Stress-strain analysis of a pipeline with inner and outer corrosion defects

[+] Author and Article Information
Zheng Liang

School of Mechatronic Engineering, Southwest Petroleum University, Southwest Petroleum University, Chengdu, Sichuan 610500, China
liangz2242@126.com

Yao Xiao

School of Mechatronic Engineering, Southwest Petroleum University, Southwest Petroleum University, Chengdu, Sichuan 610500, China
594741554@qq.com

Jie Zhang

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

1Corresponding author.

ASME doi:10.1115/1.4041434 History: Received December 28, 2017; Revised August 31, 2018

Abstract

A numerical simulation method is adopted to analyze the effects of above 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 pipes and equivalent stress and plastic strain distribution of the local defect area. The results show 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 occurs on the central part of both the outer surface defect (Type 2) and on 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.

Copyright (c) 2018 by ASME
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