Research Papers: Design and Analysis

Local and Global Reference Stress for Circumferential Irregular-Shaped Defects in Pipes

[+] Author and Article Information
Igor Orynyak

IPP-Centre Ltd.,
8, Strutyns'kogo, Street,
Kyiv 01014, Ukraine
e-mail: igor_orinyak@yahoo.com

Sergii Ageiev

IPP-Centre Ltd.,
8, Strutyns'kogo, Street,
Kyiv 01014, Ukraine
e-mail: ageev_serg@ukr.net

Sergii Radchenko

IPP-Centre Ltd.,
8, Strutyns'kogo, Street,
Kyiv 01014, Ukraine
e-mail: rad_s@mail.ru

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 27, 2014; final manuscript received September 24, 2014; published online February 20, 2015. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 137(4), 041203 (Aug 01, 2015) (10 pages) Paper No: PVT-14-1098; doi: 10.1115/1.4028680 History: Received June 27, 2014; Revised September 24, 2014; Online February 20, 2015

Numerical procedures for calculation of reference stresses for pipelines with circumferential defects, based on simulation of global and local ultimate plastic states, are proposed. There are some peculiarities of proposed procedures. First, the schematic analysis of the deformation process of pipe with surface defects is suggested, based on which two critical cases have been specified: Global (the net-section-collapse (NSC) criterion) and local, which are applicable for a very wide surface defect and for a sharp crack, respectively. The global solution also describes behavior of through-wall defects. Second, within the framework of the available NSC criterion the unified algorithm for determination of reference stresses (global solution) for irregular-shaped circumferential defects under multifactor loading (internal pressure, axial force, bending moment) is proposed. Third, according to the local modeling, the restricted capability to resist plastic deformations is takes into account by inserting of artificial symmetrical defect. The unified procedure for calculation of reference stresses (local solution) for pipe with irregular-shaped circumferential defects under multifactor loading is developed. Finally, the results obtained from the proposed solutions are compared with the ones from full-scale burst tests.

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Fig. 1

Stress distribution according to data [21] (a) and [22] (b)

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Fig. 4

Distribution of strains in defect-free infinite pipe (a) and in cracked infinite pipe (b)

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Fig. 5

Distribution of displacements (a) and strains and stresses (b) in cracked pipe

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Fig. 6

Cross section of a pipe with an imaginary defect of a constant depth φ0<(π/2)-ψ (a) and irregular shape (b)

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Fig. 8

Boundary between leak and break

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Fig. 9

Comparison of calculated and experimental results

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Fig. 10

Pipe specimen with notch

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Fig. 11

Cross section of pipe specimen

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Fig. 12

Scheme of pipe specimen loading by bending moment



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