Surface stress correction of the thick welded plate measured by contour method using eigenstrain method

The longitudinal stress distribution on the cut plane is constructed by the eigenstrain method based on part of the internal stress data measured by contour method, and the surface stress error is corrected by the eigenstrain method; the effect of the order of basis function for constructing eigenstrain distribution on the constructed stress is also investigated. Results show that longitudinal stress distribution trend on the cut plane constructed by eigenstrain method agrees well with that by the contour method, the surface stress is increased by about 27% as compared with the result of contour method. The surface stresse obtained by the eigenstrain method agrees well with that measured by the XRD method, therefore, the stress error on the surfaces can be corrected to some extent by the eigenstrain method; the longitudinal stress on the cut plane can be constructed with the eigenstrain basis function with the order of 16 in the x direction and 10 in the y direction along the cutting surface.