|
|
Analysis of welded joints using Finite Element Method
Štěrba, Martin ; Kala, Jiří (referee) ; Hradil, Petr (advisor)
This diploma thesis is concerned with the numerical analysis of welded aluminim structures. In these structures, there are significant decreases in the mechanical properties at the area of the weld and in the heat affected zone as a result of welding. Within this thesis, simulations of quasi-statically loaded welded joints made from EN AW-6082 T6 alloy were performed to investigate the load capacity and ductility of these joints. Computations were performed using a programme system based on an explicit finite element method. To describe material anisotrophy, a nonlinear material model called the Weak texture model was chosen. Material properties of the weld and the heat affected zone were considered to be different from base material. The required material parameters were adopted from available literature, however, material tests and indetification procedure of these parameters were described. In comparison with the experimental data, the results of the numerical simulations showed a relatively good ability of models to capture load capacity of studied welded joints. Nevertheless, due to mesh sensitivity of models caused by localization of deformation, it was not possible to determine ductility of these joints.
|
|
|
Manufacturing of the Steering Rod
Velcer, Miroslav ; Štroner, Marek (referee) ; Řiháček, Jan (advisor)
The thesis deals with the design of the production of the lower control arm of the rear axle made of aluminium alloy EN AW-6082 T6 for the Porsche 996. The technology of die forging on screw presses is chosen for the production, which is the focus of the theoretical part of the thesis. At the beginning of the practical part, the manufacturability of the part is evaluated and the basic process parameters such as technological allowances, machining allowances, limit deviations and the shape of the forging groove are determined according to the standards. With the help of a set of cross-sections, the shape of the ideal forging is constructed. Based on it, the dimensions of the forging produced by cross wedge rolling are determined. The selection of cutting and heating of the blank is related to this issue. Based on the determined parameters, a forging tool is constructed. Furthermore, the calculation of the forging force according to Tomlenov is performed, on the basis of which the screw press is selected. To verify the functionality of the forging tool with the given forging die and to analyze the process including the force parameters, numerical simulation is carried out in Simufact Forming software using finite element method.
|
|
|
Analysis of welded joints using Finite Element Method
Štěrba, Martin ; Kala, Jiří (referee) ; Hradil, Petr (advisor)
This diploma thesis is concerned with the numerical analysis of welded aluminim structures. In these structures, there are significant decreases in the mechanical properties at the area of the weld and in the heat affected zone as a result of welding. Within this thesis, simulations of quasi-statically loaded welded joints made from EN AW-6082 T6 alloy were performed to investigate the load capacity and ductility of these joints. Computations were performed using a programme system based on an explicit finite element method. To describe material anisotrophy, a nonlinear material model called the Weak texture model was chosen. Material properties of the weld and the heat affected zone were considered to be different from base material. The required material parameters were adopted from available literature, however, material tests and indetification procedure of these parameters were described. In comparison with the experimental data, the results of the numerical simulations showed a relatively good ability of models to capture load capacity of studied welded joints. Nevertheless, due to mesh sensitivity of models caused by localization of deformation, it was not possible to determine ductility of these joints.
|
guest ::
