Research Papers: Design and Analysis

Fully-Plastic Strain-Based J Estimation Scheme for Circumferential Surface Cracks in Pipes Subjected to Reeling

[+] Author and Article Information
Luís F. S. Parise

Department of Naval Architecture and
Ocean Engineering,
University of São Paulo,
São Paulo, SP 05508-900, Brazil
e-mail: luis.parise@usp.br

Claudio Ruggieri

Department of Naval Architecture and
Ocean Engineering,
University of São Paulo,
São Paulo, SP 05508-900, Brazil
e-mail: claudio.ruggieri@usp.br

Noel P. O'Dowd

Department of Mechanical,
Aeronautical and Biomedical Engineering,
Materials and Surface Science Institute,
University of Limerick,
Castletroy, Co.,
Limerick, Ireland
e-mail: Noel.ODowd@ul.ie

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 24, 2013; final manuscript received July 26, 2014; published online February 23, 2015. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 137(4), 041204 (Aug 01, 2015) (8 pages) Paper No: PVT-13-1102; doi: 10.1115/1.4028111 History: Received June 24, 2013; Revised July 26, 2014; Online February 23, 2015

Modern installation techniques for marine pipelines and subsea risers are often based on the reel-lay method, which introduces significant (plastic) strains on the pipe during reeling and unreeling. The safe assessment of cracklike flaws under such conditions requires accurate estimations of the elastic–plastic crack driving forces, ideally expressed in a strain-based formulation to better account for the displacement controlled nature of the reeling method. This paper aims to facilitate such assessments by presenting a strain-based expression of the well-known Electric Power Research Institute (EPRI) estimation scheme for the J integral, which is directly based upon fully plastic descriptions of fracture behavior under significant plasticity. Parametric finite element simulations of bending of circumferentially cracked pipes have been conducted for a set of crack geometries, pipe dimensions, and material hardening properties representative of current applications. These provide the numerical assessment of the crack driving force upon which the nondimensional factors of the EPRI methodology, which scale J with applied strain, are derived. Finally, these factors are presented in convenient graphical and tabular forms, thus allowing the direct and accurate assessment of the J integral for circumferentially cracked pipes subjected to reeling. Further results show that crack driving force values estimated using the proposed methodology and the given g1 factors are in very close agreement to those obtained directly from the finite element simulations.

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Grahic Jump Location
Fig. 1

Pipeline reeling procedure. (a) Schematic view [1]. (b) Corresponding strain history.

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Fig. 2

Evolution of normalized J against applied bending moment (normalized by moment corresponding to the tensile strength, M0uts), and applied axial strain for a typical circumferentially cracked pipe

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Fig. 3

Schematic illustration of the pipe configuration, crack geometry, and pure bending loading considered in the numerical analyses

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Fig. 4

Typical finite element model employed in the computational simulations: (a) Pipe mesh and rigid link at the remote end; (b) detail of the crack region; and (c) crack tip mesh.

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Fig. 5

Stress–strain curves for the different materials analyzed in the finite element models (shown up to 4% strain only)

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Fig. 6

Variation of g1 with normalized crack depth and length for D/t = 10: (a) n = 5; (b) n = 10; and (c) n = 20

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Fig. 7

Variation of g1 with normalized crack depth and length for D/t = 20: (a) n = 5; (b) n = 10; and (c) n = 20

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Fig. 8

Illustration of g1 factor calculation procedure based on linear regression over numerical data. D/t = 10, a/t = 0.3, θ/π = 0.12, n = 5

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Fig. 9

Comparative evolution of J with applied strain as calculated from finite element analyses and as estimated using g1 factors. D/t = 20, a/t = 0.3, θ/π = 0.12, n = 10




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