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Fiber reinforcements for polymer composites
Knob, Antonín ; Grégr, Jan (referee) ; Čech, Vladimír (advisor)
The bachelor thesis is concerned with an influence of surface modification of fibrous reinforcements on mechanical properties at the fiber-matrix interface in fiber-reinforced polymer composites. Polyester resin was used as a matrix, glass and carbon fibers were the reinforcements. The composite sample consisted of polymer matrix in a form of cylindrical body placed on a bundle of fibers. Untreated fibers and fibers with a commercial sizing were used for fabrication of composite samples. The tensile test using a materials testing machine (Zwick) was employed to evaluate adhesion at the fiber-matrix interface.
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Precise bonding of composite materials
Tellinger, Adam ; Gregor, Lukáš (referee) ; Kupčák, Radim (advisor)
This bachelor's thesis deals with the issue of bonding composite materials. The first part of the bachelor's thesis is focused on research into the production of composite materials and gluing technologies. The content of the practical part is the design of test specimens and a preparation for their bonding with subsequent production. Furthermore, verification of compliance with the required accuracy of bonded joints when using different adhesives using 3D measurements.
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Formula Car Monocoque Design
Žídek, Tomáš ; Dundálek, Radim (referee) ; Ramík, Pavel (advisor)
The diploma thesis describes the design of a carbon fiber monocoque Formula Student car according to current rules. The first part is focused on construction solutions of frames used in Formula Student cars. Following is a summary of the important rules for constructing composite monocoque. Subsequently are described composite materials and their properties. The main part of the thesis deals with the structural design of the CAD program and a computational model to simulate the load case in FEM program. The obtained results from the analysis of the monocoque are compared with the values allowed by the rules of Formula Student. In conclusion of this thesis is evaluated the proposed composite monocoque.
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Advanced materials for FDM/FFF 3D print
Rygl, Michal ; Vespalec, Arnošt (referee) ; Koutecký, Tomáš (advisor)
The presented work deals with the issue of FDM / FFF 3D printing with a focus on materials with added carbon fiber. The aim of this work is to experimentally analyze the effect of carbon additive on printed parts using mechanical and thermomechanical tests. Testing of selected materials has shown that the effect of carbon additive varies according to the used base material. For example, carbon in PET-G has reduced impact strength by up to 64%. However, carbon filled CPE has demonstrated the ability to absorb impact energy up to by 28.5%. The different effect of carbon fiber was measured on the CPE material in a tensile test, where the yield strength was reduced during the stretching of the samples at room temperature, but the modulus of elasticity was increased. The absolutely positive effect of carbon was measured on all observed polymer filaments in the thermomechanical 3-point bending test, when the carbon versions of the materials achieved better results. The measured data brings an extension of the possibility of comparing the results with other types of materials suitable for 3D printing in the field of research. From a practical point of view the test results can be used for the actual choice of material when printing models has specific conditions of use. Another practical use of the analyzed data is the use of printable results of advanced materials for the creation of print profiles for other desktop 3D printers of the FDM/FFF type.
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Precise bonding of composite materials
Tellinger, Adam ; Gregor, Lukáš (referee) ; Kupčák, Radim (advisor)
This bachelor's thesis deals with the issue of bonding composite materials. The first part of the bachelor's thesis is focused on research into the production of composite materials and gluing technologies. The content of the practical part is the design of test specimens and a preparation for their bonding with subsequent production. Furthermore, verification of compliance with the required accuracy of bonded joints when using different adhesives using 3D measurements.
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Production of composite materials using vacuum infusion
Ciran, Adam ; Gregor, Lukáš (referee) ; Zouhar, Jan (advisor)
The theoretical part of the bachelor thesis deals with the definition of composite material, then the division of the most used fabric reinforcements and matrices, with a focus on reinforcements made of glass and carbon fiber and flax fiber. It then discusses vacuum infusion techniques, their description and applications. In the practical part, emphasis is placed on the fabrication of specimens using vacuum infusion technology of carbon fiber, glass fiber and flax using an epoxy matrix. The last part is the evaluation of the fabricated samples.
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Advanced materials for FDM/FFF 3D print
Rygl, Michal ; Vespalec, Arnošt (referee) ; Koutecký, Tomáš (advisor)
The presented work deals with the issue of FDM / FFF 3D printing with a focus on materials with added carbon fiber. The aim of this work is to experimentally analyze the effect of carbon additive on printed parts using mechanical and thermomechanical tests. Testing of selected materials has shown that the effect of carbon additive varies according to the used base material. For example, carbon in PET-G has reduced impact strength by up to 64%. However, carbon filled CPE has demonstrated the ability to absorb impact energy up to by 28.5%. The different effect of carbon fiber was measured on the CPE material in a tensile test, where the yield strength was reduced during the stretching of the samples at room temperature, but the modulus of elasticity was increased. The absolutely positive effect of carbon was measured on all observed polymer filaments in the thermomechanical 3-point bending test, when the carbon versions of the materials achieved better results. The measured data brings an extension of the possibility of comparing the results with other types of materials suitable for 3D printing in the field of research. From a practical point of view the test results can be used for the actual choice of material when printing models has specific conditions of use. Another practical use of the analyzed data is the use of printable results of advanced materials for the creation of print profiles for other desktop 3D printers of the FDM/FFF type.
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Technology of manufacturing of carbon fibre composites by hot forming
Přikryl, Pavel ; Slaný, Martin (referee) ; Zouhar, Jan (advisor)
This master’s thesis deals with the composite materials and especially aims on the carbon and glass fiber composites. It points out different composition types and manufacturing methods which reflect in the different mechanical properties, final quality of the manufactured part and also in the manufacturing time. The practical part includes two particular manufacturing methods using prepregs, one cured in an autoclave and one by hot compression moulding.
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Application of composite materials for sport optics
Kupčák, Radim ; Slaný, Martin (referee) ; Zouhar, Jan (advisor)
In Its first half this master's thesis describes composite materials with carbon fiber reinforced plastics being the main focus point. An overview of production technologies follows. The major objective of the second part of this master's thesis is to design and manufacture a simplified model of an optical device using prepregs.
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