Validated numerical analysis of residual stresses in safety relief valve (SRV) nozzle mock-ups: Influence of axial restraint on distortion and residual stress predictions

P. J. Bendeich, O. Muránsky, C. J. Hamelin, M. C. Smith, L. Edwards

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

A simulation of the residual stress and distortion produced during the fabrication of a dissimilar metal weld (DMW) in a safety relief valve (SRV) was performed using an axi-symmetric finite element model. Traditionally, the ends of the axi-symmetric model are allowed to move freely in the axial direction, producing satisfactory predictions of residual stress; this capability has been demonstrated in previous studies [1]. However, the main limitation of the accepted axi-symmetric restraint approximation lies in the assumption of a weld bead being deposited at infinite speed, thus neglecting the constraint provided by previously deposited and already solidified weld metal. The axial constraint method presented in the current work provides a means to overcome this limitation, leading to more accurate predictions of distortion and residual stress without resorting to a computationally expensive 3D analysis.

Original languageEnglish
Pages (from-to)285-288
Number of pages4
JournalComputational Materials Science
Volume62
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

Keywords

  • Dissimilar metal weld
  • Residual stress
  • Restraint
  • Weld modelling

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