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Stanovení mechanických vlastností dřeva v čerstvém stavu
Jakeš, Ondřej
This bachelor thesis deals with the determination of mechanical properties of wood in a fresh state. The object of the research was Acer platanoides. The mechanical properties were determined using the destructive method on the Zwick Z050. The primary objective was to determine the density, the modulus of elasticity, the modulus of rupture and also to determine the relationship between the individual variables. The secondary objective was to use the results obtained and to compare the density variability along the trunk and the density dependence on the cardinal point.
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Povrchová úprava starého dřeva
Gerža, Pavel
This bachelor thesis deals with the issue of suitable surface treatment on the surface of degraded wood by atmospheric corrosion for indoor use. In this thesis three types of paint are compared. The paints are nitrocellulose coating, water-borne coating and two-component polyurethane paint. Surface treatments are evaluated for physical and mechanical properties of the surface. The physical and mechanical properties of the degraded surface are compared with the surface of fresh spruce wood prior to the application of paints and after the application of paints. This bachelor thesis also explains the issue of atmospheric degradation of wood and properties of degraded surface.
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Stanovení pružnostních a pevnostních charakteristik dřeva v čerstvém stavu
Bielesz, Robin
This thesis examines the elasticity and strength characteristics of freshly felled timber. Specifically, the wood of Norway maple (Acer platanoides L.). There was a whole trunk of one tree from urbanized environment, which were marked the world sides. After production of individual samples with dimension od 20 × 20 × 30 mm it has been necessary for each sample to describe his former position in the trunk (height, location in the trunk, location of the world side). The final experiment was performed on the testing machine Zwick 050, samples were tested by destructive method by pressure along the fibers. Then the results were processed using program testXpert from Zwick. The result is how to change the density, strength and elasticity characteristics in different locations in tree trunk.
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Vliv defektů ve dřevě na stanovení rychlosti šíření zvuku ve dřevě v čerstvém stavu
Vobořil, Matěj
This bachelor research deals with determining the speed of sound propagation in wood in fresh state. Specifically, maple milk (Acer platanoides L.) was investigated. Acoustic properties were determined by the non-destructive method thanks device from Fakopp company. These were an ultrasonic timer and a microsecond timer. Sensors like SD02, TD45 and US10 were selected for measurement. The primary objective was to determine the velocity of the sound signal propagating both 1 m long trunk and the 20 x 20 x 300 mm sized samples and to determine the effect of wood defects on that velocity. The secondary objective was to determine the dependence of the measured results depending on the world side.
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Pevnost lepeného spoje spárovky ze starého dřeva
Gerža, Pavel
The diploma thesis deals with the problem of suitable adhesive for gluing of joints from old, degraded, spruce and fir wood for the production of visible front sur-faces of wooden furniture. Two types of adhesives are compared. Polyvinyl acetate glue and hare glue. Mechanical properties are evaluated on the bonded joints. There are compared mechanical properties of old spruce and fir glued wood with fresh spruce and fir glued wood.
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