COMPARATIVE STUDY OF MATERIAL CONSTITUTIVE MODELS IN FINITE ELEMENT ANALYSIS OF T-SHAPED MODEL WITH ELECTROSLAG WELDING JOINT SUBJECTED TO CYCLIC LOADING

In high-rise steel structures, electroslag welding (ESW) is used for joining box-shaped columns and H-shaped beams. The slit at the ESW joint raises the risk of brittle fractures due to tensile stress and large heat input. Studies using experiments and finite element analysis (FEA) showed a strong correlation between maximum principal stress near the slit and brittle fracture occurrence. To prevent such fractures, cyclic loading in FEA is essential. Common models like Chaboche & Rousselier's cannot account for strain amplitude dependency of cyclic hardening, unlike Chaboche's memory surface model. This study compares these models' impact on ESW joint stress-strain states.