Numerical Investigation of Stresses in Transverse Fillet Weld Lap Joint

Abstract

Transverse fillet lap weld joint is designed for tensile strength as one of the plates exerts shear force while the other one exerts tensile force. So, stress prediction is not easy. Stress distribution at the fillet weld with lap joint is predicted without residual stresses previously. Various experimental and analytical approaches are listed in literature review. Stresses at the fillet weld are obtained only at realistic set of boundary conditions. This work includes stress distribution at the weldment using Coupled Field Transient Analysis in ANSYS workbench. Temperature dependent mechanical and thermal properties of structural steel A992 grade 50 at elevated temperatures upto 20000C are used for non-linear analysis. Multi-linear isotropic hardening plasticity model is used for non-linear strain hardening response until necking begins. Moving heat is modelled using ACT extension. Structural distortion is the outcome of this heat flux input and residual stresses are generated due to temperature field developed. Stresses at different paths are predicted in the presence of residual stresses. The findings of this study indicate that stresses obtained are significantly higher in the presence of residual stresses and their behaviour are also changed.