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Development of a methodology for calculating the residual stresses of a weldment in the Salome Meca software environment
Babišta, Jan ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The usage of welding in the process of manufacturing has become very widespread, mainly due to its low cost, versatility and the possibility of its automation. With its expansion comes higher demand for the possibilities of weld evaluation during the phase of design. Nowadays its possible to use tools based on finite element method for such evaluation. But the most commonly used tools are often very expensive. Therefore, the possibility of using Open-Source tool such as Salome-Meca to simulate the welding process as an alternative to commercial software was investigated. The first part of the work deals with the welding process and a description of the formation of residual stresses and deformations. It also deals with the description of the Salome-Meca software environment and the Code-Aster solver. In the next part the capabilities of the software in relation to problem of welding simulation are discussed. Furthermore, the goemetry of solved weldment, welding conditions, material properties and boundary conditions of the calculation are described. And finally, the individual solutions, their results and disadvantages of used approaches.
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Analysis of the use of the "instant center of rotation" method in the calculation of atypical welds in numerical computational modeling
Babišta, Jan ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The usage of welding for connection of two materials is common method for its speed, economy and its potential automatization. But when the statically loaded weld connection is designed and simulated using FEA, the singularity appears, so the deformation and stress can’t be presented as relevant. For elimination of this influence the Instantaneous center of rotation (ICR) method can be used. This method assess only the angles of reaction force from segments of weld. This thesis is focused on the effect of material, geometry, loads, supports and magnitude of loading force on the position of ICR. In the first part of thesis, the ICR method is compared with elastic method, which is the other potential method for weld assessment. The basics of each method are presented. For the second part, the normativ design of weld is created and assessed using both of potential methods for solution. The numercial model is created in the next step. The model is then calculated for numerous combination of materials, geometry, FE mesh and loads. Last part of this theses the results are compared between numerical and analytical solution of position of ICR. Also the best combination of geometry and material was chosen for the best results.
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Development of a methodology for calculating the residual stresses of a weldment in the Salome Meca software environment
Babišta, Jan ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The usage of welding in the process of manufacturing has become very widespread, mainly due to its low cost, versatility and the possibility of its automation. With its expansion comes higher demand for the possibilities of weld evaluation during the phase of design. Nowadays its possible to use tools based on finite element method for such evaluation. But the most commonly used tools are often very expensive. Therefore, the possibility of using Open-Source tool such as Salome-Meca to simulate the welding process as an alternative to commercial software was investigated. The first part of the work deals with the welding process and a description of the formation of residual stresses and deformations. It also deals with the description of the Salome-Meca software environment and the Code-Aster solver. In the next part the capabilities of the software in relation to problem of welding simulation are discussed. Furthermore, the goemetry of solved weldment, welding conditions, material properties and boundary conditions of the calculation are described. And finally, the individual solutions, their results and disadvantages of used approaches.
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Analysis of the use of the "instant center of rotation" method in the calculation of atypical welds in numerical computational modeling
Babišta, Jan ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The usage of welding for connection of two materials is common method for its speed, economy and its potential automatization. But when the statically loaded weld connection is designed and simulated using FEA, the singularity appears, so the deformation and stress can’t be presented as relevant. For elimination of this influence the Instantaneous center of rotation (ICR) method can be used. This method assess only the angles of reaction force from segments of weld. This thesis is focused on the effect of material, geometry, loads, supports and magnitude of loading force on the position of ICR. In the first part of thesis, the ICR method is compared with elastic method, which is the other potential method for weld assessment. The basics of each method are presented. For the second part, the normativ design of weld is created and assessed using both of potential methods for solution. The numercial model is created in the next step. The model is then calculated for numerous combination of materials, geometry, FE mesh and loads. Last part of this theses the results are compared between numerical and analytical solution of position of ICR. Also the best combination of geometry and material was chosen for the best results.
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