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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)492-499
Number of pages8
JournalMaterials at High Temperatures
Volume34
Issue number5-6
Early online date20 Sep 2017
DOIs
DateAccepted/In press - 10 Sep 2017
DateE-pub ahead of print - 20 Sep 2017
DatePublished (current) - 2 Nov 2017

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.

    Research areas

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

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Taylor and Francis at https://doi.org/10.1080/09603409.2017.1378965 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 766 KB, PDF document

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