The influence of welding mechanical boundary condition on the residual stress and distortion of a stiffened-panel

摘要

Stiffened panel structure is one of the most commonly used structure type in ship and offshore engineering, aeronautics and astronautics and other fields. The basic joint type of stiffened panel structure is welding. One important factor affecting welding quality is mechanical boundary condition. The present work aims to obtain the influence of welding mechanical boundary condition on the residual stress and distortion of a stiffened-panel. Thermal elastic-plastic finite element method (FEM) is used to calculate the welding distortion and residual stress of a stiffened-panel under different mechanical boundary conditions. Welding distortion and residual stress at typical positions of the stiffened-panel are calculated. The results show that mechanical boundary conditions mainly affect the welding deformation and have little influence on the residual stress of stiffened-panels. Symmetric boundary condition can not only refrain localized deformation effectively but also decrease the overall bending magnitude of stiffened panels middle cross-section.