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Residual stress distribution in a Ti-6Al-4V T-joint weld measured using synchrotron X-ray diffraction

Xu, Lei; Zhang, Shu-Yan; Sun, Wei; McCartney, David G.; Hyde, Thomas H.; James, Jon; Drakopoulos, Michael

Authors

Lei Xu

Shu-Yan Zhang

Wei Sun

David G. McCartney

Thomas H. Hyde

Jon James

Michael Drakopoulos



Abstract

To improve the manufacturing quality of welded structures, to prevent failures at weld joints and to predict their lifetime, measurements of the residual stresses generated by welding in the structures are extremely useful. The residual stresses may reduce the component life due to phenomena that occur at low applied stresses such as brittle fracture, fatigue and stress corrosion cracking. Welded thin Ti-6Al-4V panel components are commonly found in aero-engine assemblies and the weld integrity and reliability are critical. In this work, the residual stress distributions in a welded thin Ti-6Al-4V T-joint were measured by the newly developed SScanSS program with synchrotron X-ray diffraction technique. The measurement performed in this study, which included a large number of measurement points, has mapped a complete stress field in a thin sheet T-joint weld. It has not only provided improved understanding of residual stress in such a joint but also filled the missing link between the residual stress obtained by numerical modelling and their validation. The results have shown that the longitudinal stresses play the most important role in the residual stress distribution over the flange and high tensile stresses appear in the region near the weld zone. The measured results were compared with numerically predicted results and these showed good agreement.

Journal Article Type Article
Publication Date Oct 1, 2015
Journal The Journal of Strain Analysis for Engineering Design
Electronic ISSN 0309-3247
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 50
Issue 7
APA6 Citation Xu, L., Zhang, S., Sun, W., McCartney, D. G., Hyde, T. H., James, J., & Drakopoulos, M. (2015). Residual stress distribution in a Ti-6Al-4V T-joint weld measured using synchrotron X-ray diffraction. Journal of Strain Analysis for Engineering Design, 50(7), https://doi.org/10.1177/0309324715599462
DOI https://doi.org/10.1177/0309324715599462
Keywords Ti–6Al–4V T-joint; Residual stress; Diffraction; Synchrotron X-ray; Finite element
Publisher URL http://dx.doi.org/10.1177/0309324715599462
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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