Abstract
In order to propose high effective simulation using finite element method (FEM) for predicting deformation and residual stress generated by one pass butt welding, a series of numerical analyses were carried out. By idealizing the movement of heat source (the instantaneous heat input method), the tendency of welding out-of-plane deformation and the residual stress distribution could be predicted. The computing time was around 9% of that by the precise model with considering the movement of heat source. On the other hand, applicability of two dimensional shell elements instead of generally used three dimensional solid elements was examined. The heat input model with considering the temperature distribution in the thickness direction was proposed for the simulation by using the shell elements. It was confirmed that the welding out-of-plane deformation and residual stress could be predicted with high accuracy by the model with shell elements and the distributed heat input methods. The computing time was around 8% of that by the precise model with solid elements.
Highlights
In constructing steel structures, welding is generally used for joining and assembling members
For predicting welding deformation and residual stress generated in structural steel members, numerical simulation by thermal elasto-plastic analysis based on finite element method (FEM) is an effective method [2]
Computing Time The results indicated that the welding deformation and residual stress could be simulated with high accuracy by the precisely modeled analysis in which the movement of heat source was considered and three dimensional solid elements were used
Summary
In constructing steel structures, welding is generally used for joining and assembling members. (2014) High Effective FE Simulation Methods for Deformation and Residual Stress by Butt Welding of Thin Steel Plates. For predicting welding deformation and residual stress generated in structural steel members, numerical simulation by thermal elasto-plastic analysis based on FEM is an effective method [2]. Welding is a complicated phenomenon involving non-steady heat transfer by movement of heat source, temperature dependency of physical constants and mechanical properties of material and three dimensional elasto-plastic problems [3] It takes huge computing times for welding simulation of large steel structures even though the performance of computer currently becomes faster and faster. For modeling the movement of weld heat source, heat input elements are generated step by step in the calculation considering the welding speed. A : The sectional area of the heat input elements, qm : Heat energy (J/mm3), and L : The length of each heat input element (mm)
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