Determination of the profile of the complete residual stress tensor in a VPPA weld using the multi-axial contour method

M. E. Kartal, C. D M Liljedahl, S. Gungor, L. Edwards, M. E. Fitzpatrick

    Research output: Contribution to journalArticle

    58 Citations (Scopus)

    Abstract

    The multi-axial contour method is a recent development of the contour method of stress measurement. It permits measurement of the 3D residual stress distribution in a body, based on the assumption that the residual stresses are due to an inelastic misfit strain (eigenstrain) that does not change when a sample containing residual stresses is sectioned. The eigenstrain is derived from measured displacements due to residual stress relaxation when the specimen is sectioned. By carrying out multiple cuts, the full residual stress tensor in a continuously processed body can be determined, where the specimen has an initial length-to-width aspect ratio of 2:1. In the present study, first a finite element simulation of the technique was carried out to verify the method numerically. The method was then used to determine the residual stresses in a VPPA-welded sample, and the results were validated by neutron diffraction measurements.

    Original languageEnglish
    Pages (from-to)4417-4428
    Number of pages12
    JournalActa Materialia
    Volume56
    Issue number16
    DOIs
    Publication statusPublished - Sep 2008

    Keywords

    • Neutron diffraction
    • Residual stresses
    • Welding

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Materials Science(all)
    • Metals and Alloys

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