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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number109491
JournalEngineering Fracture Mechanics
Publication statusPublished - 2023 Sept 27

Bibliographical note

Funding Information:
This research was supported by LG Electronics, Korea. Thank you for whom it may concern.

Publisher Copyright:
© 2023 Elsevier Ltd


  • 90° elbow pipe
  • Fatigue cracking location
  • In-plane bending

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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