Pipe geometry effect on fatigue cracking location of 90° elbows under in-plane bending

Jin Ha Hwang; Seok Pyo Hong; Jinsung Kim; Simon Chin; Yun Jae Kim

doi:10.1016/j.engfracmech.2023.109491

Pipe geometry effect on fatigue cracking location of 90° elbows under in-plane bending

Jin Ha Hwang, Seok Pyo Hong, Jinsung Kim, Simon Chin, Yun Jae Kim

School of Mechanical Engineering

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

Abstract

In this technical note, the criterion for fatigue cracking location for 90° elbows under in-plane bending is presented. The criterion is found using published elastic solutions and elastic-plastic FE analysis results. It is found that the most important parameter affecting fatigue crack location is the mean radius-to-pipe thickness ratio, r_m/t. The circumferential crack at outer intrados is predicted for r_m/t <4–5, and the axial crack at inner crown for r_m/t >4–5. The exact value of r_m/t depends slightly on the bend radius-to-mean pipe radius ratio. This conclusion is found to be appropriate from high cycle fatigue to very low cycle fatigue loading, and to be independent on the material.

Original language	English
Article number	109491
Journal	Engineering Fracture Mechanics
Volume	290
DOIs	https://doi.org/10.1016/j.engfracmech.2023.109491
Publication status	Published - 2023 Sept 27

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

90° elbow pipe
Fatigue cracking location
In-plane bending

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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10.1016/j.engfracmech.2023.109491

Cite this

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title = "Pipe geometry effect on fatigue cracking location of 90° elbows under in-plane bending",

abstract = "In this technical note, the criterion for fatigue cracking location for 90° elbows under in-plane bending is presented. The criterion is found using published elastic solutions and elastic-plastic FE analysis results. It is found that the most important parameter affecting fatigue crack location is the mean radius-to-pipe thickness ratio, rm/t. The circumferential crack at outer intrados is predicted for rm/t <4–5, and the axial crack at inner crown for rm/t >4–5. The exact value of rm/t depends slightly on the bend radius-to-mean pipe radius ratio. This conclusion is found to be appropriate from high cycle fatigue to very low cycle fatigue loading, and to be independent on the material.",

keywords = "90° elbow pipe, Fatigue cracking location, In-plane bending",

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T1 - Pipe geometry effect on fatigue cracking location of 90° elbows under in-plane bending

AU - Hwang, Jin Ha

AU - Hong, Seok Pyo

AU - Kim, Jinsung

AU - Chin, Simon

AU - Kim, Yun Jae

PY - 2023/9/27

Y1 - 2023/9/27

N2 - In this technical note, the criterion for fatigue cracking location for 90° elbows under in-plane bending is presented. The criterion is found using published elastic solutions and elastic-plastic FE analysis results. It is found that the most important parameter affecting fatigue crack location is the mean radius-to-pipe thickness ratio, rm/t. The circumferential crack at outer intrados is predicted for rm/t <4–5, and the axial crack at inner crown for rm/t >4–5. The exact value of rm/t depends slightly on the bend radius-to-mean pipe radius ratio. This conclusion is found to be appropriate from high cycle fatigue to very low cycle fatigue loading, and to be independent on the material.

AB - In this technical note, the criterion for fatigue cracking location for 90° elbows under in-plane bending is presented. The criterion is found using published elastic solutions and elastic-plastic FE analysis results. It is found that the most important parameter affecting fatigue crack location is the mean radius-to-pipe thickness ratio, rm/t. The circumferential crack at outer intrados is predicted for rm/t <4–5, and the axial crack at inner crown for rm/t >4–5. The exact value of rm/t depends slightly on the bend radius-to-mean pipe radius ratio. This conclusion is found to be appropriate from high cycle fatigue to very low cycle fatigue loading, and to be independent on the material.

KW - 90° elbow pipe

KW - Fatigue cracking location

KW - In-plane bending

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DO - 10.1016/j.engfracmech.2023.109491

M3 - Article

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SN - 0013-7944

VL - 290

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

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Pipe geometry effect on fatigue cracking location of 90° elbows under in-plane bending

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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