Research Papers: Design and Analysis

Local Limit Load Analytical Model for Thick-Walled Pipe With Axial Surface Defect

[+] 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

Maksym Zarazovskii

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

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 January 5, 2015; published online February 24, 2015. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 137(5), 051204 (Oct 01, 2015) (8 pages) Paper No: PVT-14-1097; doi: 10.1115/1.4029523 History: Received June 27, 2014; Revised January 05, 2015; Online February 24, 2015

Based on the previous limit load analytical modeling for cracked thin-walled pipe (Orynyak, I. V., 2006, “Leak and Break Models of Pressurized Pipe With Axial Defects,” Proceedings of the 6th International Pipeline Conference (IPC), Calgary, Alberta, Canada, Paper No. IPC2006-10066, pp. 41–56), the limit load model for thick-walled pipe had developed. There are some additional peculiarities included in the proposed model. First, the distribution of radial stresses is taken into consideration in the limit state formulation using Tresca's criterion. Second, related to the crack location and interaction of hoop stresses (due to the inner pressure) and axial ones (caused by local bending moment) have been assessed in the limit state. Third, hoop stresses redistribution with possibility of plastic hinge formation in zone opposite to the crack is taken into account. Finally, the proposed easy to use analytical formulas have been verified by comparing with full-scale burst tests.

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Fig. 1

Interaction of circular and axial stresses at points x0=0 and x=x1 in a cracked pipe

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Fig. 2

Axial section of a cracked thick-walled pipe

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Fig. 3

Cross section of a cracked thick-walled pipe

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Fig. 5

Numerical limit load calculation for t/R1 = 1/10, τ = 0.5 and λ1 = 1 (a) and λ2 = 5 (b)

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Fig. 6

The influence of defect shape on calculation accuracy

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Fig. 7

Pipe specimen with axial notch

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Fig. 8

Scheme of notch cutting



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