Welding simulation using a reduced order model for efficient residual stress evaluation

Abstract

In this paper, to evaluate residual stress of welded structures efficiently, we propose a novel welding simulation framework adopting the reduced order model. To construct the reduced order model, the finite element model is divided into the target part where the transient nonlinearity occurs due to welding and the omitted part where the linearity occurs. For the heat transfer analysis, a thermal boundary condition is newly defined and applied to the target part, to compensate the heat loss induced by neglecting the omitted part. For the thermal elastic plastic analysis, a reduced model comprising the stiffness matrix and the load vector for the target part is constructed using the automated static condensation method. The performance of the proposed welding simulation method is verified using several welding problems.