Quantification of stress redistribution due to mismatch in creep properties in welded branch pipes

K. H. Lee, Y. J. Kim, K. B. Yoon, K. Nikbin, D. Dean

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper reports steady-state stress distributions within the weld metal in a welded branch component, via detailed three-dimensional elastic-creep finite element analyses. The creep exponent and constants for the base and weld metal are systematically varied to simulate under-matching, even-matching and over-matching conditions in creep. Various loading conditions are also considered to see the effect of the loading mode. It is found that the mismatch effect in creep on steady-state stresses within the weld metal can be uniquely quantified by the mismatch factor, defined as a function of creep exponent and constant. Ratios of section-averaged (effective and maximum principal) stresses for the mismatched case to those for the even-matched case are linearly dependent on the mismatch factor.

Original languageEnglish
Pages (from-to)238-251
Number of pages14
JournalFatigue and Fracture of Engineering Materials and Structures
Volume33
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

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Keywords

  • Creep mismatch
  • Finite element analysis
  • Steady-state stresses
  • Welded branch junctions

ASJC Scopus subject areas

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

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