scholarly journals Analysis and prediction of welding distortion in complex structures using elastic finite element method

2012 ◽  
Vol 6 (11) ◽  
pp. 35
Author(s):  
Adán Vega Sáenz ◽  
Carlos Plazaola ◽  
Ilka Banfield ◽  
Sherif Rashed ◽  
Hidekazu Murakawa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Theory ◽  
Typical Case ◽  
Welding Distortion ◽  
Complex Structures ◽  
Ship Structures ◽  
Elastic Plastic ◽  
Inherent Strain ◽  
Element Method

The Elastic Finite Element Method based on the inherent strain theory is used to predict the welding distortion of ship structures. In addition, a method to predict welding distortion of complex structures by using elastic FEM is presented. To evaluate the effectiveness of the proposed method, a typical case of a ship's structure is examined and the resulting welding distortion is compared to that obtained by using thermal elastic-plastic finite element method.

Study on FEM Numerical Simulation Method for the Welding Distortion

2011 ◽  
Vol 704-705 ◽  
pp. 1316-1321 ◽  
Author(s):  
Yao Hui Lu ◽  
Xing Wen Wu ◽  
Jing Zeng ◽  
Ping Bo Wu
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Welding Distortion ◽  
Railway Vehicle ◽  
Welding Deformation ◽  
Bogie Frame ◽  
Elastic Plastic ◽  
Side Beam ◽  
Element Method

The control of welding distortion during assembly process is very important. At present, there are mainly two numerical simulation methods for the welding distortion which are thermo-elastic-plastic finite element method and its simplified approach of inherent strains. At first, taking T-joint as an example, the welding distortions were computed using two methods mentioned above. Based on thermo-elastic-plastic finite element method, welding process was simulated by life and death element, moving heat source and transient state thermal field etc. Then, the welding distortion was calculated by inherent strains method after thermo-elastic-plastic computation. It was concluded from the comparison that the simulation results by using the two methods are consistent. Therefore, the inherent strains method can be conveniently and economically applied to prediction of structural welding distortion in engineering. Applied the inherent strains method, welding deformation was predicted for the bogie frame side beam of high speed train. According to the deformation results from the finite element analysis, the welding deformation of the bogie frame side beam was lager than the tolerance of quality and in reasonable agreement with the experimentally determined distortion values. The work in this paper indicated that the inherent strains method was effective to predict the welding deformation so as to control the welding quality in large complex structures, such as the bogie frame of railway vehicle. Key words: welding distortion; thermo-elastic-plastic method; inherent strains approach; numerical simulation; bogie frame;

Bending Angle Estimated Based on Inherent Strain Theory during Laser Forming

2010 ◽  
Vol 663-665 ◽  
pp. 947-951
Author(s):  
Jing Zhou ◽  
Hong Shen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Theory ◽  
Laser Forming ◽  
Elastic Analysis ◽  
Forming Process ◽  
Bending Angle ◽  
Forming Mechanism ◽  
Inherent Strain ◽  
Element Method

Laser forming process analyzed under thermo-elasto-plastic finite element method can better understand the forming mechanism. However, it is very time consuming. This paper introduced the prediction of the deformation in laser forming based on the theory of inherent strain by finite element method (FEM). The relations between inherent strains and laser forming parameters based on some experimental curves and the thermo-elasto-plastic analysis can be determined, in which the inherent strains are assumed to be distributed in a rectangle shape. This method is much more convenient because only elastic analysis is involved. The effectiveness of the proposed method is demonstrated through the comparison with the experimental data.

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