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research-article

Improved J estimation by GE/EPRI method for the thin-walled pipes with constant-depth circumferential surface cracks

[+] Author and Article Information
Xia Liu

Institute of Solid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
liuxia@lnm.imech.ac.cn

Zixing Lu

Institute of Solid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing 100190, China
luzixing@buaa.edu.cn

Yan Chen

State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, ChinaSchool of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, China
chenyan@lnm.imech.ac.cn

Yong Li Sui

Pipeline Research Institute of China National Petroleum Corporation, Langfang Hebei 065000, China
suiyl1970@126.com

L. H. Dai

State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, ChinaSchool of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, China
lhdai@lnm.imech.ac.cn

1Corresponding author.

ASME doi:10.1115/1.4038226 History: Received December 18, 2016; Revised September 28, 2017

Abstract

Application of thin-walled high strength steel has become a trend in the oil and gas transportation system over long distance. Failure assessment is an important issue in the construction and maintenance of the pipelines. This work provides an engineering estimation procedure to determine the J-integral for the thin-walled pipes with small constant-depth circumferential surface cracks subject to the tensile loading based upon the GE/EPRI method. The values of elastic influence functions for stress intensity factor and plastic influence functions for fully plastic J-integral are derived in tabulated forms through a series of three-dimensional finite element calculations for a wide range of crack geometries and material properties. Furthermore, the fit equations for elastic and plastic influence functions are developed, where the effects of crack geometries are explicitly revealed. The new influence functions lead to an efficient J estimation and can be well applied for structural integrity assessment of thin-walled pipes with small constant-depth circumferential surface cracks under tension.

Copyright (c) 2017 by ASME
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