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Stress and strain analysis of femoral intramedullary nail fixation and tapes
Lamrich, Martin ; Marcián, Petr (referee) ; Florian, Zdeněk (advisor)
The presented Master’s Thesis aims at determining stress and strain analysis of femur with fracture fixed by intramedullary nail and cerclage cable. The one of the goals of this work was create computational model which will be able simulate problem. Computational model consist of model of femur , it’s geometry was created on basis of CT data, than there was created model of intramedullary nail and cerclage cable on a basis of real objects. In this work was created simply model of femur with the same material features and characteristic proportions as analyzed model of femur. On this model was investigated direct impact of cerclage cables on deformation, respectively displacement in a surroundings of femoral fracture. On a final model were applied the real loads conditions. Preload in a cerclage cable was simulated by cooling down to a temperature from analytical calculation. Concluding analysis was powered by Finite Element Method (FEM) applied in system ANSYS Workbench 14.5 . Due to a results of analysis, we could say that using cerclage cables in combination with intramedullary nail is an effective way for healing femoral shaft fractures.
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Characteristics of gels used in the fluids engineering
Hudák, Igor ; Habán, Vladimír (referee) ; Fialová, Simona (advisor)
Not only in common life, but also in the technical area the usage of gels presents some kind of standard. Gels offer a unique possibility of usage in numerous areas. The gel structure itself is a very interesting material however it’s hard to specify its characteristics. The gel system presents a huge macromolecular network which enables to observe its different characteristics in comparison to other materials. In some circumstances gels act almost as conventional materials, in other circumstances, however, they act significantly otherwise. Therefore this bachelor thesis deals with a description and summarization of single characteristics of gels in chosen branches of the mechanical engineering industry where gels are used on a daily basis, such as sealant of pipeline systems, wires or electronic components. The thesis also describes principles of gel formation, with the emphasis to building of gel substance and with respect to its mechanical and physical features. In the end, the thesis gives a comparison of chosen characteristics of gels that are used as sealants and gels that are used for encapsulation of electrical set.
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Stress-strain analysis of artery with atheroma
Janík, Rostislav ; Fuis, Vladimír (referee) ; Burša, Jiří (advisor)
This master thesis analyses stress and strain of iliac artery with atheroma. Model of artery is created as 3D and symmetric in the longitudinal cut. The first part of the thesis deals with a research, which includes obtaining information from medicine, which is necessary fort the right solution of the task. Next part dedicates to nonlinear mechanics, constitutive modeling from the view of biomechanice and computational modeling of arteries. In the next part is made analysis for load on artery by increased blood pressure. In the end were specified uncertainties of the used model and evaluated chance of atherosclerotic plaque rupture.
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Use of Retomo software for computational modeling in biomechanics
Filková, Alena ; Lisický, Ondřej (referee) ; Marcián, Petr (advisor)
This bachelor thesis deals with the issue of musculoskeletal biomechanics. More precisely, of creating a geometry model based on CT data using the RETOMO program and then a computational model. The introductory part is devoted to a brief explanation of the concepts of computed tomography and finite element methods. The following chapter provides a search of programs used to create models of geometry from CT data in biomechanics. Furthermore, the work deals with the description of selected functionalities and user environment of the RETOMO program, with the greatest emphasis on the creation of a geometry model from CT data. During the implementation of the bachelor's thesis, two models of geometry were created in the analysed program, using different segmentation functions, which were then compared with each other and then compared with a model of geometry created in another program. The GOM Inspect program was used to compare the geometry deviations of individual models. Finally, computational models were created using the CATIA program and then deformation and stress analysis was performed using the ANSYS program. The results of individual solutions were analysed, compared and evaluated.
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Mechanical Analysis of the Influence of Fabrication Tolerances on Contact Conditions between the Acetabular Cup and the Femoral Head in Total Hip Replacement
Koukal, Milan ; Horyl, Petr (referee) ; Repko, Martin (referee) ; Janíček, Přemysl (referee) ; Florian, Zdeněk (advisor)
In endoprosthesis surgery there are typically a high percentage of implant defects, these can lead to failure of the whole prosthesis. One type of total hip replacement function loss is acetabular cup loosening from the pelvic bone. This disertation examines manufacture perturbations as one of the possible reasons for this kind of failure. Both dimension and geometry manufacturing perturbations of ceramic head and polyethylen cup were analyzed. We find that perturbations in the variables analysed here affect considered values of contact pressure and frictional moment. Furthermore, contact pressure and frictional moment are quantities affecting replacement success and durability. From obtained results it can be recommended to fit head and cup with a clearance of between 0 mm and 0.05 mm. It can not be recommend using interference type of fit because of strong deterioration of the contact conditions. Roundness perturbation of ceramic head should not exceed 0.025 mm.
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Running Motion Analysis
Eliáš, Radoslav ; Kolářová, Jana (referee) ; Goldmann, Tomáš (advisor)
Cieľom tejto práce je analyzovať pohyb a držanie tela pri behu. Systém pracuje so záznamom z dvoch kamier, zboku a zozadu. Využíva nástroj na detekciu postoja ľudského tela založenú na konvolučnej metóde. Práca porovnáva niekoľko detektorov. Výsledný systém používa detektor OpenPose a implementuje knižnicu s výpočtami pre rôzne metriky používane na ohodnotenie formy behu. Výsledky sú zobrazené v multiplatformnej aplikácii. Ohodnotená bola niekoľkými experimentmi na osobnej dátovej sade videí behu.
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Biomechanical study of the upper extremity plates
Linhart, Lukáš ; Marcián, Petr (referee) ; Florian, Zdeněk (advisor)
This work deals with the possibilities and principles of fixation of fractures of the upper limb. It is divided into five chapters. The introductory chapter discusses the biomechanics and its inclusion in contemporary science. The next chapter describes a brief history of healing and fixation of fractures of the upper limb. The third chapter is devoted to the anatomy of the upper limb, knowledge of which is the effective fixation of fractures of the upper extremity necessary. Another chapter is devoted to the classification and description of the type of osteosynthesis internal fixation of the upper limb. Furthermore, this chapter discusses the principles and mechanisms of LCP fixation. The last fifth point is detailed study of specific humeral locking plate. To create a computational model was used SolidWorks software and ANSYS Workbench.
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Biomechanical study on upper extremity fixation
Rafaj, Svatomír ; Marcián, Petr (referee) ; Florian, Zdeněk (advisor)
This bachelor’s thesis deals with fixation and biomechanical aspects of fractures of the upper limb. The first part of the thesis discusses anatomy, knowledge of which is necessary for effective fixation of fractures. It describes the history of inner fixation of fractures and modern curing methods of fractures with a focus on locking compression plates. The second part of the thesis discusses strain-stress analysis of assemblage of humerus and applied locking compression. Computational model was created with the support of ANSYS Workbench 16.0 and SOLIDWORKS 2016 software. Computation was executed by finite element method using ANSYS Workbench 16.0 computational systém.
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Strain-stress analysis of fixed bone of foot
Zapletal, Jakub ; Fuis, Vladimír (referee) ; Návrat, Tomáš (advisor)
This diploma thesis deals with analysis of the rigidity of different variations of foot fixations. In the thesis there is a description of elementary anatomy of foot and its patology. Furthermore the possible corrections of hallux deformities and chosen fixators are described. The problem of analysis is soluted by the method of finite elements. The thesis also includes steps of geometery model creation based on 3D scanning. Three differents types of fixations are compared in this thesis and each of them is created in two different levels of details. There is a comparation, analysis of final solutions and chosen influences on the rigidity in the conclusion.
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