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Article

Reference Stress Based Approach to Predict Failure Strength of Pipes With Local Wall Thinning Under Combined Loading

[+] Author and Article Information
Do-Jun Shim, Young-Jin Kim

SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea

Yun-Jae Kim

Department of Mechanical Engineering, Korea University, 1-5 Ka, Anam-dong, Sungbuk-gu, Seoul 136-701, Korea

J. Pressure Vessel Technol 127(1), 76-83 (Mar 15, 2005) (8 pages) doi:10.1115/1.1849228 History: Received August 27, 2003; Revised July 08, 2004; Online March 15, 2005
Copyright © 2005 by ASME
Topics: Pressure , Stress , Pipes , Failure
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References

Figures

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Schematic illustration of a pipe with idealized local wall thinning, under combined internal pressure P and global moment M
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Comparison of maximum moment from full-scale pipe test data with those from existing limit load solution for pipes with local wall thinning under combined internal pressure and global bending using (a) σf=(σyu)/2 and (b) σfu. Detailed information on pipe test data is given in Table 1.
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Typical finite element mesh employed in the present work: 2θ=π/2, l=200 mm
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True stress and strain data for A333 Gr. 6 steel used for FE analyses in the present work
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Comparison of σlocalC, estimated according to Eq. (4), with FE results for pipes with local wall thinning under combined internal pressure and global bending. The defect is located in the tensile stressed region and the internal pressure P is fixed to 10 MPa.
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Comparison of σlocalC, estimated according to Eq. (4), with FE results for pipes with local wall thinning under combined internal pressure and global bending. The defect is located in the compressive stressed region and the internal pressure P is fixed to 10 MPa.
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Effect of internal pressure on estimated σlocalC, according to Eq. (4), with FE results for pipes with local wall thinning under combined internal pressure and global bending: (a) For the case when the defect is subject to tension, and (b) for the case when the defect is subject to compression. Note that p=(PRm)/(σyt).
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Comparison of maximum moment from full-scale pipe test data under combined internal pressure and global bending with those from the proposed method based on both ultimate tensile stress and true ultimate tensile stress. Detailed information on pipe test data is given in Table 1.

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