Identification of material properties for finite element simulation of the deep rolling process applied to welded joints

Abstract

During butt welding of structural steels, an inhomogeneous material state across the weld occurs that has a detrimental influence on fatigue strength. In the presented study, the identification of Lemaitre Chaboche elastoviscoplastic model parameters is shown. The identification was conducted for base material, heat affected zone and filler material of submerged arc butt welded 1.8813 (S355MLO) structural steel. The derived constitutive model was integrated into a finite element simulation of the deep rolling process, which has not been investigated before for the post treatment of welded joints. Mechanical process loads were derived, giving first explanations of the deformation behavior.