Study on the simplified numerical spot welding simulation by using the flexibility influence coefficient method

In this study, the spot welding procedures were simulated in detail using the finite element method (FEM). The stiffness matrix of any element that may reflect residual stress and residual displacement was obtained from the simulation based on calculations with the flexibility influence coefficient method. The results of static analysis on existing models and modal analysis were also compared using the spot welding elements proposed in this paper. The purpose of this study is to improve the reliability of the analysis by reflecting the residual stress of the spot welds and to design a simplified spot weld model to allow faster and more accurate analysis of structures with multiple spot welds. In analysis of structures with multiple weld points and the equivalent stiffness matrix element method for spot welds presented in this paper is expected to reduce the analysis time and produce more accurate results compared to existing analysis methods.