Evaluation of limit loads for circumferentially cracked pipes under combined loadings

Ho Wan Ryu, Jae Jun Han, Yun-Jae Kim

Research output: Contribution to journalArticle

Abstract

Since the Fukushima nuclear accident, several researchers are extensively studying the effect of torsion on the piping systems In nuclear power plants. Piping installations in power plants with a circumferential crack can be operated under combined loading conditions such as bending and torsion. ASME Code provides flaw evaluations for fully plastic fractures using limit load criteria for the structural integrity of the cracked pipes. According to the recent version of Code, combined loadings are provided only for the membrane and bending. Even though actual operating conditions have torsion loading, the methodology for evaluating torsion load is not established. This paper provides the results of limit load analyses by using finite element models for circumferentially cracked pipes under pure bending, pure torsion, and combined bending and torsion with tension. Theoretical limit load solutions based on net-section fully plastic criteria are suggested and verified with the results of finite element analyses.

Original languageEnglish
Pages (from-to)453-460
Number of pages8
JournalTransactions of the Korean Society of Mechanical Engineers, A
Volume39
Issue number5
DOIs
Publication statusPublished - 2015 May 1

Fingerprint

Load limits
Torsional stress
Pipe
Bending (deformation)
Plastics
Piping systems
Structural integrity
Nuclear power plants
Loads (forces)
Accidents
Power plants
Cracks
Membranes
Defects

Keywords

  • Circumferentially crack
  • Combined loadings
  • Finite element analysis
  • Limit Loads
  • Torsion

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Evaluation of limit loads for circumferentially cracked pipes under combined loadings. / Ryu, Ho Wan; Han, Jae Jun; Kim, Yun-Jae.

In: Transactions of the Korean Society of Mechanical Engineers, A, Vol. 39, No. 5, 01.05.2015, p. 453-460.

Research output: Contribution to journalArticle

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