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TECHNICAL PAPERS

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

[+] Author and Article Information
Yun-Jae Kim

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

Do-Jun Shim, Hwan Lim, Young-Jin Kim

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

J. Pressure Vessel Technol 126(2), 194-201 (May 05, 2004) (8 pages) doi:10.1115/1.1687379 History: Received December 12, 2002; Revised September 23, 2003; Online May 05, 2004
Copyright © 2004 by ASME
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References

Figures

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Schematic illustration of a pipe with idealized local wall thinning, under internal pressure P or global bending moment M
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Comparison of failure pressure from full-scale pipe test data with those from two existing engineering estimation schemes for pipes with local wall thinning under internal pressure. Detailed information on pipe test data is given in Tables 1 and 2.
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Comparison of failure moment from full-scale pipe test data for pipes with local wall thinning under global bending to net-section collapse (NSC) analysis: (a) for the case when the defective region is subject to tensile stresses; and (b) for the case when the defective region is subject to compressive stresses. Detailed information on pipe test data is given in Tables 3 and 4.
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True stress and strain data for two materials, the A333 Gr. 6 steel and the API X65 steel, used for FE analyses in the present work
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Comparison of σlocal, estimated according to Eq. (13), with FE results for pipes with local wall thinning under internal pressure
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Effect of material on estimated σlocal, according to Eq. (13), with FE results for pipes with local wall thinning under internal pressure
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Comparison of σlocal, estimated according to Eq. (16), with FE results for pipes with local wall thinning under global bending. The defect is located in the tensile stressed region.
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Comparison of σlocal, estimated according to Eq. (16), with FE results for pipes with local wall thinning under global bending. The defect is located in the compressive stressed region.
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Effect of material on estimated σlocal, according to Eq. (16), with FE results for pipes with local wall thinning under 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.
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Comparison of failure pressure from full-scale pipe test data under internal pressure with those from the proposed method based on (a) ultimate tensile stress, and (b) true ultimate tensile stress. Detailed information on pipe test data is given in Tables 1 and 2.
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Comparison of failure moment from full-scale pipe test data under global bending with those from the proposed method based on both ultimate tensile stress and true ultimate tensile stress: (a) for the case when the defect is subject to tension, and (b) for the case when the defect is subject to compression. Detailed information on pipe test data is given in Tables 3 and 4.

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