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Smart materials for actuators
Brehovský, Patrik ; Hadaš, Zdeněk (referee) ; Huzlík, Rostislav (advisor)
The bachelor’s thesis “Smart materials for actuators” deals with appropriate use materials, named smart, in actuators. At the beginning, the thesis completes requests about actuators, which we need to set before making project. Next part is about the research of smart materials suitable used in actuators. The thesis continues with description of few more interesting smart materials. Thesis is ended with summary, which material is suitable to use for few selected projects and why.
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Smart Materials for Medical Applications
Kaplán, Martin ; Hájek, Petr (referee) ; Florian, Zdeněk (advisor)
This thesis describes materials which react to external stimuli. These materials are know as Smart materials. The thesis provides an overview of these materials and their use in the field of medicine. A lot of attentions is paid to Nitinol as the most significant representative of Smart materials. The thesis brings a simulation of using shape memory effect of Nitinol staple for bone fracture fixation. This simulation use the method of finite elements for solving and it is done in ANSYS modeling software. The simulation has only demonstrational purpose.
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Analysis of Smart Materials
Rašner, Martin ; Lošák, Petr (referee) ; Hadaš, Zdeněk (advisor)
The bachelor's thesis "Smart Materials Analysis" deals with the description of intelligent materials in the way of usability in technical practice. At first, the research of smart materials is carried out, which is further elaborated on a detailed description of shape memory materials. In order to investigate the functionality of the material and the description of its behaviour in terms of non-linear oscillation, a simplified model is proposed. The practical part deals with the application of passive damping of Nitinol. The solution is accomplished by modelling program MATLAB / Simulink.
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Metal Biocompatible Materials
Stejskal, Pavel ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The bachelor’s thesis deals with metal biocompatible materials, their chemical composition, heat treatment, final mechanical properties and possibilities of application of these materials. Basic terms and separation of the biocompatible materials are explained in thesis introduction. Next there are outlined a historical side and main reasons of development of these materials.
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Memory Materials
Josiek, Robert ; Šesták, Petr (referee) ; Molliková, Eva (advisor)
Currently, shape memory materials are very popular, especially intermetallic compounds NiTi. This alloy is very stable and corrosion resistant, but its production is very difficult because of the high reactivity of titanium. Shape memory effect in this material is dependent on many parameters, such as chemical composition or heat treatment. This bachelor’s thesis explains one-way and two-way memory effect. Another one phenomenon associated with the martensitic transformation, superelasticity, is mentioned, too. The applications of these materials are described in separate chapter of this bachelor’s thesis.
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The metal biocompatible materials and their use
Klusák, Ondřej ; Čelko, Ladislav (referee) ; Klakurková, Lenka (advisor)
The aim of proposed bachelor thesis is in a form of a literature search to create an overview of materials for medical application. The thesis is focused in detail primarily on selected groups of (inter)metallic biocompatible materials like nitinol, titanium (Ti), titanium alloys and cobalt based alloys. The explanation of term Biocompatibility and separation of the materials according to their biological tolerance is included in thesis introduction and next several chapters. This thesis provide various information both about historical and current development, the manufacture processes, chemical compositions, mechanical properties and the most common applications of these materials. One of the major aims of this work is to outline an expected future development of biocompatible materials and to introduce new trends. This thesis is written and can be dedicated not only for specialists but also for students interested in the topic of metallic biocompatible materials.
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Mechanics of laser cut stent grafts
Major, Štěpán ; Kocour, Vladimír ; Hubálovský, Š.
This article is dedicated to a finite element analysis of tubular, laser cut stent grafts with peak-to peak bridge geometry under representative cyclic loading conditions for abdominal aortic aneurysm repair. Cardiovascular diseases are the principal cause of death in the developed world. For computational analysis, ANSYS software was employed to study the mechanical behavior of stents. Contrary to conventional engineering materials, nitinol stent fracture is not stress based but strain based. The effects of crimpling and cyclic pressure loading on stent–graft fatigue life were simulated and analyzed.
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Heat treatment conditions and their influence on precipitation of Ni4Ti3 phase in Ni-rich NiTi shape memory alloys
Dlouhý, Antonín ; Bojda, Ondřej ; Fiala, J.
The present work deals with a quantitative analysis of Ni4Ti3 precipitates after solution annealing (850°C/30min) and ageing (450°C/1hod) in air or inert argon atmosphere. The attention is given not only to the size of precipitates in the vicinity of grain boundaries and in the grain volume and to the corresponding Ni4Ti3 volume fractions, but also to subsequent martensitic transformations B2-(R)-B19’. Quantitative analysis of transmission electron microscopy micrographs is based on the automatic image processing by means of the Adaptive Contrast Control programme. Martensitic transformations were documented using differential scanning calorimetry. Results indicate a homogeneous precipitation of Ni4Ti3 with the heterogeneous distribution of crystallographic particle variants. A possible influence of the heat treatment environment on Ni4Ti3 precipitation and martensitic transformations is discussed in this work.
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