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Research Papers: Design and Analysis

Improved J Estimation by GE/EPRI Method for the Thin-Walled Pipes With Small Constant-Depth Circumferential Surface Cracks

[+] Author and Article Information
X. Liu

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

Z. X. Lu

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

Y. Chen

State Key Laboratory of Nonlinear Mechanics,
Institute of Mechanics,
Chinese Academy of Science,
Beijing 100190, China;
School of Engineering Science,
University of Chinese Academy of Sciences,
Beijing 101408, China
e-mail: chenyan@lnm.imech.ac.cn

Y. L. Sui

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

L. H. Dai

State Key Laboratory of Nonlinear Mechanics,
Institute of Mechanics,
Chinese Academy of Science,
Beijing 100190, China;
School of Engineering Science,
University of Chinese Academy of Sciences,
Beijing 101408, China
e-mail: lhdai@lnm.imech.ac.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 18, 2016; final manuscript received September 28, 2017; published online November 30, 2017. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 140(1), 011201 (Nov 30, 2017) (10 pages) Paper No: PVT-16-1238; doi: 10.1115/1.4038226 History: Received December 18, 2016; Revised September 28, 2017

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 General Electric/Electric Power Research (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 (3D) finite element (FE) 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.

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References

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Figures

Grahic Jump Location
Fig. 1

(a) The geometrical dimension of the pipe with a circumferential surface crack and (b)geometry of the constant depth surface crack

Grahic Jump Location
Fig. 2

Finite element mesh for the pipe with a/t = 0.25, c/a= 8 and D/t = 75

Grahic Jump Location
Fig. 7

Determination of h1 factors from the linear variation of J¯p with (P/PL)n+1 for the pipes with n = 5 and D/t = 75: (a)a/t = 0.15and (b) a/t = 0.45

Grahic Jump Location
Fig. 9

Determination of h1 factors from the linear variation of J¯p with (P/PL)n+1 for the pipes with n = 15 and D/t = 75: (a)a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 3

Comparison of F values for pipes with a/t = 0.45 and θ/π = 0.05

Grahic Jump Location
Fig. 4

Comparison of J-integral values for relatively thick-walled pipes with D/t = 20, a/t = 0.25 and θ/π = 0.1

Grahic Jump Location
Fig. 5

Comparison of J-integral values for thin-walled pipes with D/t = 100, a/t = 0.45 and θ/π = 0.05

Grahic Jump Location
Fig. 6

Variation of F values, resulting from the FE results and the proposed equation, with c/a for pipes with D/t = 75

Grahic Jump Location
Fig. 8

Determination of h1 factors from the linear variation of J¯p with (P/PL)n+1 for the pipes with n = 10 and D/t = 75: (a)a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 13

Comparison of J-integral estimated by using new elastic and plastic influence functions with FE results for thin-walled pipes having D/t = 75 and n = 15: (a) a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 14

The effect of D/t on JP/P0 relationship for thin-walled pipes with n = 5: (a) a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 15

The effect of D/t on JP/P0 relationship for thin-walled pipes with n = 10: (a) a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 16

The effect of D/t on JP/P0 relationship for thin-walled pipes with n = 15: (a) a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 11

Comparison of J-integral estimated by using new elastic and plastic influence functions with FE results for thin-walled pipes having D/t = 75 and n = 5: (a) a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 12

Comparison of J-integral estimated by using new elastic and plastic influence functions with FE results for thin-walled pipes having D/t = 75 and n = 10: (a) a/t = 0.15 and (b) a/t = 0.45

Grahic Jump Location
Fig. 10

Variation of the h1 values, determined from the FE results and proposed equation, with c/a: (a) n =5, (b) n = 10, and (c) n = 15

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