Numerical Simulation of Welding Residual Stress Distribution on T-joint Fillet Structure

Abstract

Fillet welding is widely used in the assembly of ships and offshore structures. The T-joint configuration is frequently reported to experience fatigue damage when a marine structure meets extreme loads such as storm loads. Fatigue damage is affected by the magnitude of residual stresses on the weld. Recently, many shipping registers and design guides have required that the fatigue strength assessment procedure of seagoing structures under waveinduced random loading and storm loading be compensated based on the effect of residual stresses. We propose a computational procedure to analyze the residual stresses in a T-joint. Residual stresses are measured by the X-ray diffraction (XRD) method, and a 3-D finite element analysis (FEA) is performed to obtain the residual stress profile in the T-joint. The proposed finite element model is validated by comparing experiments with computational results, and the characteristics of the residual stresses in the T-joint are discussed.

Numerical simulation on residual stresses of stainless steel SS-304 thin welded pipe

“…Results showed that except the starting location, there is no effective difference in the axial and hoop residual stresses in the welded pipe. 14 Computational procedure is proposed by the Hwang et al 15 in which the residual stresses in the welded T-joint are measured using the X-ray diffraction (XRD). The 3D FE analysis was done to find out the profile of the residual stresses, and the proposed model was validated with the experimental result.…”