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Numerical Simulation Study on Welding Process of Center Sill and the Development of Weld Fatigue Database

Author: CuiRuiJie
Tutor: YangZuoHua
School: Dalian Jiaotong University
Course: Vehicle Engineering
Keywords: Welding deformation Fatigue prediction Local - global mapping Database system
CLC: TG404
Type: Master's thesis
Year: 2010
Downloads: 175
Quote: 2
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Abstract


With the rapid development of China's railway industry, more and more high-speed, heavy trains and urban rail train in operation, corresponding to the ever-increasing demands on the quality and reliability of rail vehicles. Welded structure as the most widely used in rail vehicles structure, due to its welded structure as well as the special nature of the manufacturing process, the welding residual deformation and welding fatigue these two issues has been the main problems facing the design and manufacture of welded structures. Control of welding deformation essence weld quality control, and quality control of the weld affect the fatigue life of the weld is the most critical factor. The welding residual deformation of structural design integrity, manufacturing processes and structural reliability of the key factors. After welding distortion correction, neither economic serious injury reliability of its work, science, quantitative prediction of welding deformation law, and on this basis to give the optimal control, the integrity of welded components design and manufacturing process method the choice has important theoretical value and engineering significance. At the same time, the findings have been found welded structure as rail vehicles most prone to fatigue failure of the structure is the key link for reliability design of rail vehicles. Therefore, in the design process of its fatigue life of scientific prediction, and contrast of the program. In this paper, both at home and abroad welding deformation and welding fatigue life prediction Review of Research on the basis around the fatigue of welded structures and deformation simulation, some kind of container flat car chassis beam and passenger motor car bogies for the object, carried out the following work: First of all, about the theory of heat conduction, the welding deformation simulation principle, reliability design criteria and welded structures fatigue life prediction basic principle, elaborated on this basis, the welding deformation control method based on the local - global mapping and welding sequence optimization method, based on IIW standard welded structure fatigue life prediction method. Then, a \Prepared and completed according to the form of the beam structure, the external weld required four kinds of welded joints, and on this basis, the use of Gaussian double ellipsoid heat source model of these heat sources in SYSWELD software simulation and checking. This heat source check local model of the external beam weld the SYSWELD and PAM-ASSEMBLY software with the overall model is calculated and compared with experimental results and impact from the welding sequence, materials beam welding deformation factors were optimized. Weld fatigue evaluation methods, loading mode IIW welding structural fatigue evaluation system, and UIC standards. In order to facilitate the design of fast fatigue assessment, to VisualStudio 2005 as a development platform to SQL Server 2005 database platform, developed IIW standard based on the welded structure fatigue and process design system. The system can effectively assess the fatigue life of welded structures, this article describes the specific implementation process and verify the practicability of the system, and a welded bogie frame.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding general issues > Stress and deformation of welded structures
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