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Stress-strain analysis of internal plate fixator of distal radius fracture
Hussliková, Veronika ; Hájek, Petr (referee) ; Marcián, Petr (advisor)
Distal radius fractures are one of the most common fractures. In case of a complicated fracture, it is necessary to proceed with surgical treatment using an internal plate fixator. The aim of this thesis was to perform a stress-strain analysis of an internal plate fixator attached to the distal radius using bone screws. Computational modeling using finite element method was used to assess the mechanical interactions among the individual elements of this system. The stress-strain analysis was performed for three different types of fixation in geometry models including a distal radius fracture and a healed distal radius and for three different types of loads. In the evaluation of the results, the influence of the type of load and the influence of the healing of the bone tissue were assessed. For the bending load, which was the most critical, the yield strength was not exceeded in the plate or in the bone screws, and therefore irreversible plastic deformation of the material did not occur.
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Computational modeling of 3D printing structures made of PET-G material
Michálek, Mojmír Cyril ; Halama, Radim (referee) ; Vosynek, Petr (advisor)
Master’s thesis deals with computational modeling of 3D printing process done by FDM method made from PETG material using finite element method. Research section contains a brief description of 3D printing process modeling possibilities using finite element method and summarizes fundamental mechanical properties of thermoplastics. In practical section there is an evaluation of specimens printed of PETG material tensile tests. Further there is performed a sensitivity analysis of various influences on vertical imperfection of printed part Idler and is done its design modification, which is based on results of this analysis.
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Analysis of the use of 3D slicer SW for computational modeling in biomechanics
Kratochvílová, Hana ; Marcián, Petr (referee) ; Vosynek, Petr (advisor)
This thesis deals with a freeware program called 3D Slicer and its usefulness in the area of biomechanics. The introduction part describes the scope of the program and its functions. The next chapter shows a step-by-step modelling of a bone geometry using CT images and a comparison of geometries of bones created with different grayscale level using a program Gom Inspect. The last part focuses on importing geometries created in 3D Slicer, specifically femur and pelvis, into FEM platform ANSYS Workbench for preprocessing and defining femur’s stress and deformation characteristics.
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Analysis of methods of modeling bone loss due to osteoporosis
Orlová, Lucie ; Marcián, Petr (referee) ; Vosynek, Petr (advisor)
Tato bakalářská práce se zabývá biomechanikou kosti. Hlavním cílem je teoretický průzkum řešení pro výpočtové modelování dlouhých kostí a změn této struktury vlivem osteoporózy. V rámci rešerše jsou vysvětleny související biologické pojmy a základní principy mechaniky. Na základě informací shromážděných v teoretické části práce jsou provedeny výpočty pomocí metody konečných prvků v programu ANSYS.
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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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Stress-Strain Analysis of Mandible with Fixator
Semerák, Jaroslav ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
This diploma thesis deals with fixation of the lower jaw fractures using commercially produced fixators. The topic was researched on the basis of the available literature. The thesis also indicates basic anatomy of the surveyed area and nowadays the most commonly used materials. Subsequently, the stress-strain analysis of the lower jaw with the applied angular stable fixation plate was performed. The solution was performed for the lower jaw with a fracture in the area of the condyle with different types of fixation plates made of CP-Ti Grade 4. In addition, the strain analysis of the healed lower jaw with the fixators after the defect in the area of chin and angle was performed. The mechanical interaction analysis of the lower jaw with defect and applied fixation plate was solved by using computational modeling with variational approach, in use of the finite element method in Ansys Workbench 18.1. The thesis also describes in detail the creation of a computational model of the system and the subsequent solution.
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Stress-strain analysis of tumorous total endoprosthesis of hip joint
Vystrk, Tomáš ; Konvalinka, Jan (referee) ; Marcián, Petr (advisor)
Tumorous total endoprosthesis of hip joint is used for reconstruction of the limb affected by bone tumor and to regain its functnion. Longterm load conditions must be considered by the reconstruction and the joint mobility must be enabled. Suitability of the endoprosthesis depends on its construction considering shape, material and with this related mechanical properties. This thesis deals with creation of computational model and stress-strain analysis of tumorous total endoprosthesis of hip joint. There are two different types of endoprosthesis modeled in this thesis, each with three different length of resected bone replacement. Based on stress-strain analysis an assessment of possible limit states is made.
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Methods of fixation of the upper limb fractures
Litera, Jan ; Marcián, Petr (referee) ; Florian, Zdeněk (advisor)
The presented bachelor thesis is focused on current methods of a fixation of upper limb fractures. Part of the thesis is a literature review and a description of the upper limb anatomy. This is necessary to solve the problems associated with upper limb fractures. The history of the treatment of upper limb fractures enables to gain an insight and a benefit of the current methods of the fixation of the upper limb. Based on the acquired knowledge, there is created a simple computational model of a humeral fracture fixation using a LCP and a classical plate. The computational model for the specific load models was solved in the Ansys Workbench 18.2 computing system. The biomechanical analysis based on the results presentation of the solution of the described simple model showed differences between the application of the LCP and the classical plate.
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Application of chiroptical techniques for exploration of inhomogeneous systems
Jungwirth, Jakub ; Bouř, Petr (advisor) ; Burda, Jaroslav (referee)
Master's Thesis Abstract Jakub Jungwirth Understanding molecular structure of biochemically relevant molecules is of funda- mental interest for these molecules ultimately determine all functions of living organisms. Raman optical activity (ROA) is a chiroptical spectroscopic technique highly sensitive to molecular structure. This thesis presents an introduction to important concepts of ROA and two independent projects aiming to extend the possibilities of ROA, both from the- oretical and experimental points of view. The first project is a conformational analysis of dialanine, an important model peptide. A combined quantum mechanics / molecu- lar dynamics approach was used in spectral simulations and resulted in spectra with an unprecedented agreement with experiment. To obtain information about conformer equi- libria, a decomposition procedure of an experimental spectrum into calculated individual conformer spectra was coded and tested, and proved to be a viable approach. The sec- ond project was an attempt to carry out pioneering ROA measurements of amyloid fibrils, which are difficult to measure due to their inhomogeneous nature (insolubility, birefrin- gence). Within this project, the preparation protocol for such samples was improved. The performance of an all new rotational cuvette was examined and found...
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