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Surface pre-treatment of structural aluminum alloys for bonded joints
Pikner, Jan ; Doskočil, Leoš (referee) ; Wasserbauer, Jaromír (advisor)
This thesis deals with pre-treatment of surface of aluminium alloys. The theoretical part focuses on the properties of aluminium and its alloys, on methods of surface treatment and the possibilities of quality assessment of pre-treated surface. The experimental part deals with finding of a proper method of pre-treatment. The quality of surface pre-treatment is assessed by observation by SEM with EDS and by single lap shear tests of adhesive joints. According to evaluated results, the optimalised methods are qualitatively and financially compared with the commercial method.
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Joints from FRP composite intended for transport infrastructure
Simon, Pavel ; Maňas,, Pavel (referee) ; Schmid, Pavel (referee) ; Karmazínová, Marcela (advisor)
This thesis deals with junction points of construction used in transport infrastructure, which are made of FRP composite material. Main focus is on bonded joints. The material and geometrical criteria od FRP material and there influence to junctions are analyzed. In sequential steps the development of the design of joints applicable to reference constructions - pedestrian walkways is documented. There are also presented practical experiences from the tests of joints of overlapped and single-sided joints, as well as experience from the design, production and testing of two types of pedestrian bridges on a real scale. Furthermore, extensive comparison of joints, in particular T-joints with closed profiles for selected types of fasteners, is provided. From a simple connection, screws and rivets or plain bonding to combined joints. These are assessed both in terms of bearing capacity and their deformation behavior. These tests are performed for two material combinations, FRP-FRP and FRP-steel.
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Joining of CFRP and metal parts
Dolinský, Jiří ; Urík, Tomáš (referee) ; Symonov, Volodymyr (advisor)
Tato práce popisuje základní principy spojování kompozitních materiálů a také spojování kompozitních materiálů s kovovými protikusy. Hlavním cílem této práce je navrhnout vhodný návrh spoje mezi kovovým závěsem a nosníkem křídla z uhlíkového kompozitu pro létající automobil AeroMobil 3.0. Pro výpočet napěťové analýzy byla použita speciální analytická metoda, která byla provedena za pomoci počítačových softwarů MATLAB a Excel. Konečný návrh spoje je vymodelován pomocí softwaru Autodesk Inventor. Předložené řešení není prakticky testovánu a tudíž by mělo být považováno pouze za přibližný návrh budoucího konstrukčního řešení.
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Vliv pojivové báze lepidla a druhu lepeného spoje na pevnost lepeného spoje masivního dřeva akátu
Stehlík, Pavel
This bachelor's thesis deals with the effect of a glue basis and a type of selected wood joint on the bond strength. The test was carried out on the solid robinia wood specimens which were joined in width using either finger or edge joint. The specimens were glued together with one component polyurethane adhesive or contact polyvinyl acetate adhesive. Selected joints were conditioned under normal conditions and later tested for tensile test.
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Konstrukční nábytkové spoje kompozitních materiálů na bázi dřeva s plastem aplikovaných pro výrobu nábytku
Máchová, Eliška
The main aim of the PhD thesis is to determine the influence of moisture on the me-chanical properties of furniture construction joints. The influence of moisture was examined in two groups of joints: glued joints along the length and corner joints with glued and mecha-nical fasteners. In both groups of tested joints, the joints were made of DTD, plastic and a combi-nation of these materials. Construction joints are tested for two environments with ap-propriate weather conditions, that the interiors of residential and public buildings - an envi-ronment with conditions t = 23 ± 2° C, WR = 45 ± 5 % and humid environment with condi-tions t = 23 ± 2° C, WR = 90 % (bathrooms, laundry rooms, swimming pools). Two types of mate-rials were selected, which were examined separately as well in their mutual combination. In the case of joints glued along the length, the load carring capcity of glued joint was determi-ned with two types of adhesives: epoxy and polyurethane. The highest values of strength were achieved with a material combination of plastic - plastic and a humidity of 45 % and 90 % using the PUR adhesive. The influence of moisture on the stiffness and the load carrying capacity of the joints was examined in the corner joints. In the case of corner joints, the influence of moisture on the mechanical properties was not confirmed , the decisive factor is influence of the bonded materials and the position of the fasteners.
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Joints from FRP composite intended for transport infrastructure
Simon, Pavel ; Maňas,, Pavel (referee) ; Schmid, Pavel (referee) ; Karmazínová, Marcela (advisor)
This thesis deals with junction points of construction used in transport infrastructure, which are made of FRP composite material. Main focus is on bonded joints. The material and geometrical criteria od FRP material and there influence to junctions are analyzed. In sequential steps the development of the design of joints applicable to reference constructions - pedestrian walkways is documented. There are also presented practical experiences from the tests of joints of overlapped and single-sided joints, as well as experience from the design, production and testing of two types of pedestrian bridges on a real scale. Furthermore, extensive comparison of joints, in particular T-joints with closed profiles for selected types of fasteners, is provided. From a simple connection, screws and rivets or plain bonding to combined joints. These are assessed both in terms of bearing capacity and their deformation behavior. These tests are performed for two material combinations, FRP-FRP and FRP-steel.
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Surface pre-treatment of structural aluminum alloys for bonded joints
Pikner, Jan ; Doskočil, Leoš (referee) ; Wasserbauer, Jaromír (advisor)
This thesis deals with pre-treatment of surface of aluminium alloys. The theoretical part focuses on the properties of aluminium and its alloys, on methods of surface treatment and the possibilities of quality assessment of pre-treated surface. The experimental part deals with finding of a proper method of pre-treatment. The quality of surface pre-treatment is assessed by observation by SEM with EDS and by single lap shear tests of adhesive joints. According to evaluated results, the optimalised methods are qualitatively and financially compared with the commercial method.
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Vliv extrémních podmínek na pevnost lepených spojů při použití klihových lepidel
Laštovička, Vojtěch
Bachelor's thesis studied the impact of extreme the climatic conditions on the strength of adhesive joint of several kinds of classical animal glues (bone glues, skin glues, rabbit glues, fish glues, casein glues and albumin glues). The solid wood of spruce was selected for authentication of strength of glued joints. The glued joints were exposed to normal and extreme conditions (high humidity and low temperature). After then were compared the strength of glued joints in skid in tension. A resistance of the glued joints during increasing temperature was tested at the same time.
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Joining of CFRP and metal parts
Dolinský, Jiří ; Urík, Tomáš (referee) ; Symonov, Volodymyr (advisor)
Tato práce popisuje základní principy spojování kompozitních materiálů a také spojování kompozitních materiálů s kovovými protikusy. Hlavním cílem této práce je navrhnout vhodný návrh spoje mezi kovovým závěsem a nosníkem křídla z uhlíkového kompozitu pro létající automobil AeroMobil 3.0. Pro výpočet napěťové analýzy byla použita speciální analytická metoda, která byla provedena za pomoci počítačových softwarů MATLAB a Excel. Konečný návrh spoje je vymodelován pomocí softwaru Autodesk Inventor. Předložené řešení není prakticky testovánu a tudíž by mělo být považováno pouze za přibližný návrh budoucího konstrukčního řešení.
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