研究目的
To measure the residual stress distribution of laser-welded Al–Li alloy parts using a combination of the contour method and finite-element simulation.
研究成果
The contour method can accurately measure the normal full-field residual stress on the cutting plane of welded specimens. The results of the finite-element numerical simulation and those of the contour method are in good agreement, with the distribution and variation trends of the normal residual stress on the cutting plane of the weld obtained by the two methods being basically the same.
研究不足
The study assumes that the longitudinal residual stress of the entire welded specimen remains unchanged along the thickness direction, which may not account for variations in thicker specimens. The displacement parallel to the cutting plane was not considered, which could affect the accuracy of the residual stress measurement.
1：Experimental Design and Method Selection:
The study used the contour method to measure residual stress by cutting the test piece into two parts and applying the reverse contour deformation to the finite-element model as the displacement boundary condition. A thermal/structural sequential coupling analysis method was used to establish a complete three-dimensional finite-element model of a laser-welded plate.
2：Sample Selection and Data Sources:
Two plates of 6061 Al–Li alloy were butt welded. The contour deformation of the cutting surfaces was measured by a coordinator.
3：List of Experimental Equipment and Materials:
A coordinator instrument (Zeiss Company of Germany) was used for profile measurement. The cutting was performed by submerged wire electric-discharge machining.
4：Experimental Procedures and Operational Workflow:
The specimen was cut along the centerline vertical to the weld, and the contour of the cutting surface was measured. The contour data were processed and applied to the finite-element model to invert the residual stress.
5：Data Analysis Methods:
The residual stress was calculated using the finite-element model with the negative value of displacement measured by the contour test applied to the node of the cutting surface.
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