A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The influence of welding mechanical boundary condition on the residual stress and distortion of a stiffened-panel
Abstract 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.
Highlights The numerical simulation of a stiffened-panel's welding process under different welding mechanical BCs using thermal elastic-plastic FEM is carried out in the present work. The welding-induced temperature, displacement and stress field of thee stiffened-panel are obtained, and then the welding mechanical BCs are optimized according to calculation results. The following conclusions can be obtained by the present investigation: Transverse residual stress is the main kind of stress after the welding process of the stiffened panel. The peak value of compression stress occurs in the top surface of the region adjacent to weld fillet with the magnitude of 0.4 times material yield stress, while the peak value of tensile stress occurs in the bottom surface of the region adjacent to weld fillet with the magnitude of material yield stress. Using solid element to analyze 3-dimensional heat transfer is more coincident with practical situation than shell element. Mechanical boundary conditions mainly affect the welding deformation and have little influence on residual stress of stiffened-panels. The symmetry of welding mechanical BC can not only refrain the production of localized deformation effectively, but also reduce the global bending magnitude of stiffened-panel's middle transverse cross-section.
The influence of welding mechanical boundary condition on the residual stress and distortion of a stiffened-panel
Abstract 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.
Highlights The numerical simulation of a stiffened-panel's welding process under different welding mechanical BCs using thermal elastic-plastic FEM is carried out in the present work. The welding-induced temperature, displacement and stress field of thee stiffened-panel are obtained, and then the welding mechanical BCs are optimized according to calculation results. The following conclusions can be obtained by the present investigation: Transverse residual stress is the main kind of stress after the welding process of the stiffened panel. The peak value of compression stress occurs in the top surface of the region adjacent to weld fillet with the magnitude of 0.4 times material yield stress, while the peak value of tensile stress occurs in the bottom surface of the region adjacent to weld fillet with the magnitude of material yield stress. Using solid element to analyze 3-dimensional heat transfer is more coincident with practical situation than shell element. Mechanical boundary conditions mainly affect the welding deformation and have little influence on residual stress of stiffened-panels. The symmetry of welding mechanical BC can not only refrain the production of localized deformation effectively, but also reduce the global bending magnitude of stiffened-panel's middle transverse cross-section.
The influence of welding mechanical boundary condition on the residual stress and distortion of a stiffened-panel
Zhang, Yuelin (author) / Wang, Yuanqing (author)
Marine Structures ; 65 ; 259-270
2019-02-11
12 pages
Article (Journal)
Electronic Resource
English
Effect of welding sequence on residual stress and distortion in flat-bar stiffened plates
| British Library Online Contents | 2010
Effect of welding sequence on residual stress and distortion in flat-bar stiffened plates
| Online Contents | 2010
Development of Welding Distortion Analysis Method Using Residual Strain as Boundary Condition
| British Library Online Contents | 2008