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Synchrotron x-ray measurement and finite element analysis of residual strain in TIG welded aluminium alloy 2024

Preston, RV, Shercliff, HR, Withers, PJ, Hughes, DJ, Smith, SD and Webster, PJ 2006, 'Synchrotron x-ray measurement and finite element analysis of residual strain in TIG welded aluminium alloy 2024' , Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 37 (12) , pp. 3629-3637.

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Abstract

Residual strains have been measured in a tungsten inert gas (TIG) butt-welded 2024 aluminum alloy plate using synchrotron X-ray diffraction. Novel two-dimensional strain maps spanning the entire plate reveal steep gradients in residual stress and provide detailed validation data for finite element (FE) analysis. Two variants of a FE model have been used to predict the residual strain distributions, incorporating different levels of plate constraint. The model uses decoupled thermal and elastic- plastic mechanical analyses and successfully predicts the longitudinal and transverse residual strain field over the entire weld. For butt weld geometries, the degree of transverse constraint is shown to be a significant boundary condition, compared to simpler bead-on-plate analyses. The importance of transverse residual strains for detailed model validation is highlighted, together with the need for care in selecting the location for line scans. The residual stress is largest in the heat-affected zone (HAZ), being equal to the local postweld yield stress, though the strength increases subsequently by natural aging. In addition, a halving of the diffraction line width has been observed local to the weld, and this correlates with the microstructural changes in the region.

Item Type: Article
Uncontrolled Keywords: Aluminium base alloys, welded joint, inert gas, GTA welding, residual strain, modeling, finite element method
Themes: Subjects / Themes > Q Science > QC Physics
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Civil Engineering Research Centre
Journal or Publication Title: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Publisher: Springer
Refereed: Yes
ISSN: 10735623
Related URLs:
Depositing User: H Kenna
Date Deposited: 05 Sep 2007 13:10
Last Modified: 20 Aug 2013 15:47
URI: http://usir.salford.ac.uk/id/eprint/397

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