Parametric study of the finite element modeling of shot peening on welded joints: Fid-Bau Portal

Parametric study of the finite element modeling of shot peening on welded joints

Dieng, Lamine / Amine, Darine / Falaise, Yannick / Chataigner, Sylvain

AbstractNowadays, welding in steel structure design is the most widely used assembly technology. In the case of bridge structures, it has replaced riveting and bolting for the past thirty years. It is well known that this type of structure may deteriorate not just because of corrosion but also because of fatigue issues. In the case of corrosion, specific maintenance actions are currently being undertaken by bridge owners to increase the life span of their structures, such as painting operations. In the case of fatigue issues, it is well known that the high level of residual stresses due to the welding process may increase fatigue hazards. Several techniques may be used to reduce the high level of tensile stresses in the top layer of the weld near the welding toe. In this paper, the influence of welding and shot-peening parameters is investigated. A 3D finite element model is proposed and improved. The model results are compared to the residual stresses measured on several samples using X-ray diffraction method. Effects of the shot diameter, speed and angle impact are investigated. The transverse and longitudinal residual stresses near the welded joint, with a peak tensile stress value of 250MPa and 280MPa respectively, drop to a compressive stress value of more than 50MPa and fit with the experimental results.

Graphical abstract

Highlights•Welding process and shot-peening operation have been successfully computed by FEM.•Residual stresses in welded joints subjected to shot-peening are investigated.•The effect of the shot-peening on the reduction of residual stresses was examined.•Effects of the shot diameter, speed and angle impact are investigated.•Residual tensile stress at the welded joint drops to a compressive stress value.