A method for determining the constitutive model of the heat-affected zone using digital image correlation

The heat-affected zone (HAZ) is an unmelted region of a welded joint that has changed in material properties because high temperatures during the welding process. HAZ lower strength than base (parent) (BM) and weld metal (WM). more significant if BM made steel undermatching filler used. Therefore, constitutive model essential for predicting mechanical behaviour joint. In this paper, method determining true stress–strain relationship proposed. effect transverse constraint on longitudinal deformation imposed by and/or WM eliminated linear modification factor correlating to strain. Standard tensile coupon tests were used obtain using digital image correlation (DIC). proposed reducing stress calibrated based finite element analysis (FEA). modified validated against experimental results obtained DIC. property can be advanced numerical simulation joints.