Assessment of the effect of residual stresses in elastic-plastic fracture of dissimilar welded components

Kiranmayi Abburi Venkata, Christopher Truman, Harry Coules, Satyajit Dey, Thilo Pirling

Research output: Contribution to journalArticle (Academic Journal)

1 Citation (Scopus)
217 Downloads (Pure)

Abstract

Residual stresses in welds pose a significant threat to the structural integrity of a component, especially in the presence of defects and are required to be accounted for in assessing component safety. Although the R6 assessment procedure suggests various approximate methods for incorporating these effects in defect assessment, most of them are overly conservative and not very cost-effective. A more reliable approach is to characterise the weld residual stresses around a defect and study how they interact with primary load. The current paper analyses the effects of weld residual stresses on the fracture of a dissimilar weld in the presence of defect. The weld is made between modified 9Cr–1Mo steel and 316LN stainless steel using autogenous electron beam welding. A C(T) specimen was extracted from the centre of the weld and a crack introduced in the fusion zone using electro-discharge machining. The residual stresses around the crack were measured on a grid of measurement points at mid-thickness of the C(T) specimen using neutron diffraction on the strain diffractometer SALSA at ILL, Grenoble. The measured residual stresses around the crack-tip were incorporated into a finite element model and the interaction of these with applied load was predicted under fracture.
Original languageEnglish
Pages (from-to)492-499
Number of pages8
JournalMaterials at High Temperatures
Volume34
Issue number5-6
Early online date20 Sep 2017
DOIs
Publication statusPublished - 2 Nov 2017

Keywords

  • Weld residual stresses
  • elastic-plastic fracture
  • neutron diffraction
  • finite element analysis

Fingerprint Dive into the research topics of 'Assessment of the effect of residual stresses in elastic-plastic fracture of dissimilar welded components'. Together they form a unique fingerprint.

  • Cite this