|
|
Design of manufacturing technology of a composite part using out of autoclave prepregs
Tellinger, Adam ; Gregor, Lukáš (referee) ; Kupčák, Radim (advisor)
This master’s thesis deals with the production of a composite part from prepregs using non-autoclave technology. The first part of the thesis is research of composite materials and composite manufacturing technologies. This is followed by a section that focuses on non-autoclave methods of manufacturing composite parts using prepregs. The practical part includes the design of several prototype production variants of the specified part and subsequent production of the part. The output is an evaluation of the achieved results, a comparison of the various production methods, the selection of a suitable production technology variant, and the creation of a technological guideline for this chosen method of composite part manufacturing.
|
|
|
Methodology design and proper measurement setting evaluation of ultrasound testing of composite propellers
Běhal, Antonín ; Horák, Marek (referee) ; Katrňák, Tomáš (advisor)
This thesis focuses on non-destructive ultrasonic testing of composite aircraft propellers. The theoretical part contains a review of manufacturing technologies of laminate propellers and their design. The practical part of the thesis contains the design of ultrasonic testing methodology. Dolphicam 2+ device is used for testing. The creation of appropriate settings of the ultrasonic device, for different laminate thicknesses, is performed on calibration samples containing artificially created defects. By comparing the default and modified settings, it was found that the use of the modified settings greatly improves the distinguishability of the defects from the defect-free laminate. Confirmation of the functionality of the modified setup is performed using a real propeller test. The work serves as a sample procedure for testing a laminate propeller by ultrasonic defect detection.
|
|
|
Sandwich Insert Design of the Formula Student Monocoque
Velfl, Tomáš ; Šplíchal, Jan (referee) ; Löffelmann, František (advisor)
The bachelor thesis is devoted to the insert joints and wheel suspension attachments on the racing frame of a Formula Student vehicle. First, research was done to obtain the necessary knowledge on the subject. Then the external loads stressing the joints were experimentally and computationally determined. Before starting the actual design of the attachments, the effect of introducing local loads into the sandwich structure of the monocoque was investigated, firstly on small calibration samples. The first phase of testing was to verify the failure mechanisms, the interaction between the different components of the composite sandwich and to test different attachment designs using different materials. Based on the data obtained, the material libraries were refined, and computational models were developed and extended by parametrization. Thus, in the next step, the final designs of the individual suspension points meeting the predetermined objectives were iteratively created. During validation tests, the functionality of the design and sufficient oversizing were demonstrated. Technologies such as CT scanning were also used. The results were evaluated to determine further testing options and further improvements to the current solution.
|
|
|
Design of repair material with reduced electrical impedance
Žáková, Karolina ; Černý, Vít (referee) ; Drochytka, Rostislav (advisor)
This bachelor's thesis focuses on designing a new composition of corrective material based on silicate with the aim of reducing electrical impedance. In the theoretical part, fundamental concepts necessary for understanding the topic will be described, such as terms related to conductivity, silicates, composites, and corrective materials in general. The experimental section includes the selection of raw materials, preparation, and testing of various compositions of corrective materials with different fillers. The impact of various additives on the electrical properties of the corrective material will be investigated, including its conductivity, resistivity, and cohesion. The final section summarizes and evaluates the achieved results.
|
|
|
Comparison of characteristics of pre-impregnated and conventional carbon fibre epoxy laminates
Jones, Phillip ; Juračka, Jaroslav (referee) ; Katrňák, Tomáš (advisor)
The focus of this thesis is a comparison of pre-impregnated and conventional carbon fibre laminates. The first part focuses on the production process of carbon fibre composites from the process of converting PAN to carbon fibres to the lay-up and curing process of completed parts. The second section includes numerical comparisons of different types of carbon fibre. The data is set up in a fashion to demonstrate the improvements in carbon fibre mechanical properties by comparing outdated carbon fibre to the newest fibre on the market. The included tables aid in the process of choosing the right type of carbon fibre for each specific application.
|
|
| |
|
| |
|
|
Biocomposites based on polyhydroxybutyrate for 3D printing
Horálek, Matyáš ; Tocháček, Jiří (referee) ; Přikryl, Radek (advisor)
The submitted diploma thesis deals with preparation and characterization of biocomposite based on poly-3-hydroxybutyrate. Biocomposites were fabricated with respect to later use in 3D printing. The methodology for testing different kinds of materials and their suitability for 3D printing as well as evaluation of mechanical and thermal properties was established. The first part of this work was focused on the experiments with print temperature and the material flow rate and its influence on the look of 3D printed object and on the material tendency to warp during 3D printing. The design of the experiment method was used for the analyzing of obtained data. It was proven that the amount of kaolin and tributyl citrate has positive influence in reducing warping. By optimization of the biocomposite recipe it was achieved improvement in tensile modulus of elasticticity, ductility, tensile strength, notched and unnotched toughness.
|
|
|
Optimization and characterization of dimethacrylate-based resin
Baradzina, Lizaveta ; Petruš, Josef (referee) ; Poláček, Petr (advisor)
This diploma thesis was focused on the optimization and characterization of resins based on dimethacrylate monomers. The polymerization process was also monitored depending on the type and molar ratio of monomers used, on the content of barium glass filler and the presence of glass fibers. Changes in the viscoelastic properties of materials during polymerization were also investigated. The following methods were used to characterize the prepared dimethacrylate resins and composite materials based on them: viscosimetry, differential scanning photocalorimetry (DPC), photoreology, dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). The dynamic viscosity of the prepared dimethacrylate matrices was determined by viscometry. Based on the results of DPC analysis of the tested resins, the dependences of heat flow on time, conversion on time and polymerization rate on conversion were created. With photoreology, the course of curing, the onset of the gelation point and changes in the viscoelastic properties of the systems were monitored. The viscoelastic properties of the cured composite materials were then determined by DMA in the three-point arrangement. TGA was performed to accurately determine the composition of the tested samples
|
|
|
Modern Materials for Automotive Industry
Vaníček, Jan ; Fojtášek, Jan (referee) ; Hejtmánek, Petr (advisor)
This work is focused on the description of conventional and unconventional materials that are used to build a car. Individual types of materials are sorted according to their application and characterized in terms of properties and real use. The end of each chapter is devoted to possible future trends.
|
guest ::
