Improved J and COD estimation equations covering long circumferential through-wall cracks in pipes: I- bending

Hye Won Jeong; Jae Yoon Kim; Yun Jae Kim; Nam Su Huh; Do Jun Shim

doi:10.1016/j.ijpvp.2025.105705

Improved J and COD estimation equations covering long circumferential through-wall cracks in pipes: I- bending

Hye Won Jeong, Jae Yoon Kim, Yun Jae Kim, Nam Su Huh, Do Jun Shim

Dept. of Mechanical System and Design Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

For LBB analysis of small-diameter piping in small modular reactors, elastic-plastic J and COD needs to be estimated potentially for long circumferential through-wall cracks larger than 50 % of the circumference. This paper proposes improved J and COD estimation equations for circumferential thorough-wall cracked pipes in bending, covering short-to-long cracks over 50 % of the circumference. The proposed equations are based on extensive FE analysis. Comparisons with FE J and COD results confirmed that the proposed equations improves the accuracy of estimated J and COD not only for short cracks but also for long cracks, compared to existing estimation equations.

Original language	English
Article number	105705
Journal	International Journal of Pressure Vessels and Piping
Volume	219
DOIs	https://doi.org/10.1016/j.ijpvp.2025.105705
State	Published - Feb 2026

Keywords

J and COD estimation
Long through-wall cracked pipe in bending
Reference stress approximation

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10.1016/j.ijpvp.2025.105705

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title = "Improved J and COD estimation equations covering long circumferential through-wall cracks in pipes: I- bending",

abstract = "For LBB analysis of small-diameter piping in small modular reactors, elastic-plastic J and COD needs to be estimated potentially for long circumferential through-wall cracks larger than 50 \% of the circumference. This paper proposes improved J and COD estimation equations for circumferential thorough-wall cracked pipes in bending, covering short-to-long cracks over 50 \% of the circumference. The proposed equations are based on extensive FE analysis. Comparisons with FE J and COD results confirmed that the proposed equations improves the accuracy of estimated J and COD not only for short cracks but also for long cracks, compared to existing estimation equations.",

keywords = "J and COD estimation, Long through-wall cracked pipe in bending, Reference stress approximation",

author = "Jeong, \{Hye Won\} and Kim, \{Jae Yoon\} and Kim, \{Yun Jae\} and Huh, \{Nam Su\} and Shim, \{Do Jun\}",

note = "Publisher Copyright: {\textcopyright} 2025 Elsevier Ltd",

year = "2026",

month = feb,

doi = "10.1016/j.ijpvp.2025.105705",

language = "English",

volume = "219",

journal = "International Journal of Pressure Vessels and Piping",

issn = "0308-0161",

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TY - JOUR

T1 - Improved J and COD estimation equations covering long circumferential through-wall cracks in pipes

T2 - I- bending

AU - Jeong, Hye Won

AU - Kim, Jae Yoon

AU - Kim, Yun Jae

AU - Huh, Nam Su

AU - Shim, Do Jun

PY - 2026/2

Y1 - 2026/2

N2 - For LBB analysis of small-diameter piping in small modular reactors, elastic-plastic J and COD needs to be estimated potentially for long circumferential through-wall cracks larger than 50 % of the circumference. This paper proposes improved J and COD estimation equations for circumferential thorough-wall cracked pipes in bending, covering short-to-long cracks over 50 % of the circumference. The proposed equations are based on extensive FE analysis. Comparisons with FE J and COD results confirmed that the proposed equations improves the accuracy of estimated J and COD not only for short cracks but also for long cracks, compared to existing estimation equations.

AB - For LBB analysis of small-diameter piping in small modular reactors, elastic-plastic J and COD needs to be estimated potentially for long circumferential through-wall cracks larger than 50 % of the circumference. This paper proposes improved J and COD estimation equations for circumferential thorough-wall cracked pipes in bending, covering short-to-long cracks over 50 % of the circumference. The proposed equations are based on extensive FE analysis. Comparisons with FE J and COD results confirmed that the proposed equations improves the accuracy of estimated J and COD not only for short cracks but also for long cracks, compared to existing estimation equations.

KW - J and COD estimation

KW - Long through-wall cracked pipe in bending

KW - Reference stress approximation

UR - https://www.scopus.com/pages/publications/105021873864

U2 - 10.1016/j.ijpvp.2025.105705

DO - 10.1016/j.ijpvp.2025.105705

M3 - Article

AN - SCOPUS:105021873864

SN - 0308-0161

VL - 219

JO - International Journal of Pressure Vessels and Piping

JF - International Journal of Pressure Vessels and Piping

M1 - 105705

ER -

Improved J and COD estimation equations covering long circumferential through-wall cracks in pipes: I- bending

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Keywords

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