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

Abstract

In this paper, to evaluate the residual stress of welded structures efficiently, we propose a welding simulation method utilizing a reduced order model. To construct the reduced order model, a finite element model is divided into a target part and an omitted part. For the heat transfer analysis, a thermal boundary condition is newly defined and applied to the target part, to compensate for the heat loss induced by neglecting the omitted part. For the thermal elastic plastic analysis, a reduced model for the target part is constructed using the automated static condensation method. The performance of the proposed welding simulation method adopting the reduced order model is verified by solving several welding problems, and it effectively reduces computational costs while predicting the residual stress with little loss of accuracy.

Effect of Process Parameters on Welding Residual Stress of 316L Stainless Steel Pipe

“…However, due to the irrationality of the symmetry assumption and the oversimplification, the research and analysis scope is limited, and only the influence of process changes on the pipeline stress in a fixed cross-section can be obtained. This limitation makes it difficult to effectively guide the process optimization and stress and deformation control of conventional pipe fitting welding production [16][17][18][19][20][21][22][23][24][25][26][27].…”

Efficient Structural Dynamic Analysis Using Condensed Finite Element Matrices and Its Application to a Stiffened Plate

“…Among them, the IIRS method [10] is widely known and used due to the considerable accuracy of its condensed model. With a variety of approaches, its condensation scheme has been applied in many engineering fields, such as eigenproblem analysis [11], experimental dynamics [12], FE model updating [13], buckling analysis [14], system identification [15], and welding analysis [16].…”