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FRP for concrete reinforcement
Blahová, Aneta ; Vaněrek, Jan (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with composite polymer FRP reinforcement. It descibes the method of manufacturing FRP reinforcements, which are their properties and what materials are used by manufacturers. Lists FRP reinforcement application in various structures. Also mentions the durability of FRP reinforcement in an aggressive environment and the cohesiveness of FRP reinforcement with concrete. The conclusion of the work is a proposal for experimental testing of a bond between FRP reinforcement and concrete.
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Design of a device for profiles painting on a pultrusion line
Krejčí, Miloš ; Slaný, Martin (referee) ; Zouhar, Jan (advisor)
Surface treatments of composite materials represent a specific issue in terms of the design of automatic painting equipment. The surface treatment modules were designed to be integrated into an existing pultrusion line, with an emphasis on maintaining the ergonomics of the workplace and adhering to space requirements. The selection of a suitable paint was first made from the coatings available on the market, then continued through collaboration with the manufacturer. The collaboration led to the development of a powdered, thermally curable formulation and a liquid, UV curable formulation. After adhesion tests, an optimised version of the UV formulation was selected. The design of the coating equipment is based on the requirements specific to the selected UV curable formulation. It consists of technologies for UV surface pretreatment, paint application and UV curing of the coating. The surface pretreatment is based on the experience of the supplier of the application technologies and own experiments. Coating application uses spray guns, again selected on the basis of testing in production. Curing of the coating is provided by a set of UV emitters with adjustable output power. Cost savings due to automation of the process and elimination of human labour are insignificant under current conditions due to the high price of the selected coating material. If the predicted production volumes are achieved, the savings can reach up to 10-12 CZK per linear metre of profile.
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Preparation and optimization of biocomposite material for pultrusion processing
Sousedík, Jan ; Figalla, Silvestr (referee) ; Menčík, Přemysl (advisor)
This thesis focused on the synthesis and subsequent use of polyester resin from renewable natural resources as a matrix for a biocomposite with flax fibre reinforcement. The synthesized bio-based resin was characterized by mass spectrometry (MS) and Fourier-transform infrared spectroscopy (FTIR). The pultrusion was method chosen for the preparation of the composite materials. The optimalisation of the individual components of the composite was carried out as part of the thesis. Two types of composite material were prepared, a composite with fibres surface modified by acetylation and a reference composite with unmodified fibres. The resulting composites were subjected to mechanical properties tests, namely three-point flexural test, tensile test, short beam shear test (SBS), Charpy impact test and dynamic mechanical analysis (DMA). The thermal properties were investigated by differential scanning calorimetry (DSC), heat distortion temperature test (HDT) and thermogravimetric analysis (TGA). In addition, the reinforcement adhesion was monitored by scanning electron microscopy (SEM). Determination of the water absorption of the composites was also carried out. Based on the results of the analyses, a positive effect of the surface treatment of fibres by acetylation on the mechanical properties of the composites was demonstrated.
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Surface treatment of a composite part
Bahenský, Štěpán ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis focuses on composite materials and the possibility of their surface treatment with a focus on painting. The aim was to create a layer on the surface of the material that would serve as protection against UV radiation and subsequent degradation. The first theoretical part is devoted to the material composition. In the subsections, the different types of functional components of the composites are presented. Their possible applications as well as their advantages and disadvantages are described. In addition, the theoretical part is supplemented by the types of methods used for the production of composite materials and the subsequent surface preparation in order to improve the adhesion properties of the material to the paint. The second part, which was developed in cooperation with GDP Koral, s. r. o., deals with the chosen type of surface treatment for composite materials produced by the pultrusion method. The UV coating method was chosen, where the wet layer of the varnish is cured by UV radiation. Two sets of samples were created, which differ in both the method of varnish application and the parameters of the curing process. Mechanical tests were then performed on each sample to verify the resulting adhesion capability of the paint system. The practical part also includes the design of possible technologies for the implementation of the surface treatment in the production line. In the third part, a techno-economic evaluation is presented, which focuses on the cost comparison of standard painting and painting with UV varnishes. The final section contains a summary of the findings and an evaluation of the chosen type of coating with respect to the results of mechanical tests and the possibilities of application in a pultrusion production process.
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Lightweight composite materials for automotive applications
Sousedík, Jan ; Poláček, Petr (referee) ; Přikryl, Radek (advisor)
This bachelor thesis investigated the influence of lightening filler in the form of hollow glass microbeads on the mechanical properties of composite material. The method chosen for the preparation of composite material was pultrusion. Two types of composite material were prepared as part of the bachelor thesis, specifically epoxy-vinyl ester resin-based composites and unsaturated polyester resin-based composites. Special bulked glass fibres were used as reinforcement. The final composite material was subjected to a three-point flexural test where mechanical properties were monitored. In addition, control of the distribution and adhesion of the filler was performed by using light microscopy and scanning electron microscopy (SEM).
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FRP for concrete reinforcement
Blahová, Aneta ; Vaněrek, Jan (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with composite polymer FRP reinforcement. It descibes the method of manufacturing FRP reinforcements, which are their properties and what materials are used by manufacturers. Lists FRP reinforcement application in various structures. Also mentions the durability of FRP reinforcement in an aggressive environment and the cohesiveness of FRP reinforcement with concrete. The conclusion of the work is a proposal for experimental testing of a bond between FRP reinforcement and concrete.
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Design of pultrusion line
Bábíček, Ondřej ; Kočiš, Petr (referee) ; Tůma, Jiří (advisor)
The subject of the bachelor thesis is to design pulling mechanism of pultrusion line based on research in the area of composite technology and individual types of mechanisms produced. Practical part aims on analysis suitable components and also own design including sample of drawing documentation.
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Pultrusion process of composite based on natural fibres
Letavaj, Emil ; Bábík, Adam (referee) ; Přikryl, Radek (advisor)
The theoretical part of bachelor thesis is focused on general overview of composite materials, natural fibers and their various modifications. The practical part is based on chemical treatment of flax fibers by two types of silanes, in order to optimize the interface between the phases in the composite material. Such modified fibers were applied to produce composites by pultrusion technological process. In conclusion, the impact of chemical treatment of flax fibers was reviewed on the mechanical properties of the resulting composite profiles.
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Pultrusion process of composite based on flax fibres
Hahn, Filip ; Poláček, Petr (referee) ; Přikryl, Radek (advisor)
Theoretical part of master's thesis is focused on chemical treatments of natural fibers and their use as reinforcement material in polymer composites. Flax fibers were treated with two different silane coupling agents to improve their adhesion with polymer matrix. Nature of treatment was studied by using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). Composites based on both treated and untreated flax fibers were prepared by pultrusion.technique. Mechanical properties and water absorption of prepared composites were evaluated.
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Pultrusion process optimizing of composites based on epoxy matrix
Ostrezi, Jan ; Bábík, Adam (referee) ; Přikryl, Radek (advisor)
The theoretical part of this bachelor thesis deals with current progress in the field of long fibre reinforenced composites with matrix based on epoxy resins. It also deals with production methods of composite materials, especially pultrusion. The practical part is based on pultrusion process optimizing of composites profiles based on epoxy matrix. Profiles were examined by DMA test to set the glass transition temperature.
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