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Strength and deformation analysis of parametric family of hydraulic stretchers
Jagoš, Jiří ; Vosynek, Petr (referee) ; Petruška, Jindřich (advisor)
The master thesis is focused on an evaluation of a preload lost in a tappered joint. The analyzed bolts are preloaded by a hydraulic tensioner. When the tensioner is removed, the joint is established and the preload in bolt is decreased. The analysisis carried out on axisymmetry model of joint in ANSYS Workbench 15, a finite element method is implemented in that software. The evaluation of the preload lost is made for a used range of ratio of clamped length to a nominal diameter of bolt. Geometry and material assumptions are defined. Before preloading of bolts to a desired value the process of stabilization preloading must be done otherwise outlines of the analysis are not applicable. On the base of the outlines of the analysis, the method for analytical computing of the desired pretension is done. The method involves the preload lost, which occurs due to establishment of the joint. The strength assesment of the hydraulic tensioner for bolts M72x4 is done. A 3D model of the tensioner with one plane of symmetry was used. Strength criteria for maximum allowed linear-elastic stress are in accordance with ČSN EN 13 445-3.
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Analysis of influence of geometric deviations of semifinished product on following bending process
Anděl, Tomáš ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
Presented diploma thesis was created in cooperation with Siemens s.r.o., and deals with the analysis of the bending of aluminium sheets which are later used as a conductors of high voltage electrical energy. These parts are completed into assemblies which serves as connectors of particular segments of an electrical network. The problem occurs as a result of incorrect bend, because it is impossible to join these sections properly. The customer would like to verify if the defined tolerances of semi-finished products are sufficient for proper bend and in case they are not, the tolerances should be modified. Due to the requirement for running numerical simulation in one of the open source software, the Salome-Meca program environment was used.
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The usage of Salome Meca workbench for task solution in the field of solid mechanics
Anděl, Tomáš ; Návrat, Tomáš (referee) ; Vosynek, Petr (advisor)
Presented bachelor’s thesis focuses on solving basics tasks in the field of solid me-chanics by the finite-element open-source software Salome Meca. The theoretical background of finite element method (FEM), general explanation of basic expressions and brief summary of today’s used open-source and commercial software too is intro-duced in the opening part of the thesis. The brief overview of Salome Meca compu-ting environment and then file of individual tasks solved by using this software are followed. Acquired results are later compared with the other numerical software (ANSYS Workbench) or with analytical solutions.
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Summary of FEM aplication on the basis Open Source
Tománek, Jiří ; Vosynek, Petr (referee) ; Návrat, Tomáš (advisor)
This work focuses on the summary of currently available FEM applications on the Open Source basis which are freely available on the Internet. There are three programs presented (Salome, Roshaz and Ansys) and in each of them there was an easy simple plane performed and demonstrated. In the final part, a comparison of the results and the procedures for the award plane task in the three above mentioned programs was carried out.
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The usage of Impact FEM workbench for task solution in the field of solid mechanics
Ferenc, Filip ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
This bachelor thesis is focused on calculating the main tasks in the field of solid mechanic with usage Impact FEM. At the beginning, there is some basic information about a numerical calcu-lation focusing on the Finite element method. The second part deals with Impact FEM pro-gramme description and model preparation. The main part of this thesis are examples of the tasks which I evaluated by Impact FEM. Results of those calculations were compared to the results obtained by analytic calculations and programme Ansys Workbench. Based on those verification calculations, I consider the Impact FEM programme is not able to calculate the main tasks of solid mechanic at this moment but it may be useful as a learning tool.
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Strength analysis of mold for high-pressure casting
Ferenc, Filip ; Šotka, Pavel (referee) ; Vosynek, Petr (advisor)
This master thesis had been created at the instigation of Skoda Auto. a.s. tool design department, which designed a new concept of the diecast mold. For this new concept of construction mold was requested to describe its strain-stress behaviour. The main goal of this thesis was to run s-s analysis. According to results of s-s analysis the potentially risky location had been found and the recommendation of the design improvement had been made. The problem has been solved by Finite Element Method in software ANSYS Workbench. The output of the work is mainly used as a basis for the design of high-pressure casting molds of S. A. a.s.
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Modeling of thin-walled frames mechatronic systems with fillet welds and their influence on the natural frequency
Appel, Martin ; Hadaš, Zdeněk (referee) ; Vosynek, Petr (advisor)
This bachelor thesis is focused on methods of reduction degrees of freedom and their application in mechatronical system. Next part is focused on fillet welds and their modelling in Ansys Workbench software. Individual possibilities of geometry of welds are analysed by modal, static and harmonic analysis. Aim of this thesis is comparison of results of analysis for different methods of geometry of welds. Then it compare results of modal analysis in Ansys Workbench and Adams software. Finally the work deals with possibilities of exporting from Ansys Workbench to Adams, Matlab and Excel software.
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Analysis of cracking of aluminium profiles during bending process
Kalivoda, Ondřej ; Šebek, František (referee) ; Vosynek, Petr (advisor)
The presented thesis was created in cooperation with Siemens, s.r.o. and deals with the analysis of the bending of aluminium sheets. These products are used as conductors of electrical energy. The problem happened when the bending angle was 90 ° when there was a violation outside of the bend. The aim of the thesis is to verify whether the bend is correctly designed using analytical and empirical relations and the finite element method. Because of the requirement for running numerical simulation on one of the freely available software the Salome Meca program environment was used. The results of numerical simulation did not confirm that the violation should occur. In deeper analysis appeared doubts whether it is possible to correctly evaluated result only by data from tensile test. In the final part, there are recommended some experiments which would be necessary for the correct calibration of the ductil fracture criteria.
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Analysis of load capacity of selected welded structural joints under static and cyclic load
Peč, Michal ; Vlk, Miloš (referee) ; Vosynek, Petr (advisor)
Welding is a widely used method of connecting components because of its efficiency, great value and almost endless possibilities of join types. A great variability of geometrical configurations of welds is problematic due to the assessment of the weld joint. Depending on this topic this thesis was focused on the assessment of weld joints statically and cyclically. Work in the first part deals with the search of methods for evaluation of welds and depending on identified options is subsequently selected American standard AISC assessment of welded joints. The method is applied into FEA analysis and simple welded joints are evaluated. Using FEM are computed three examples on which a comparative analysis was performed. Comparisons were made with the analytical solution based on changes in the parameters of the computational model. The change is primarily related to material properties, mesh size and division of the weld on segments. On the basis of knowledge from analysis of simple joints, method was extended to more general welded joints with the possibility of determining the maximum loading force.
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