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Assessment of the impact of the type of wood on the properties of snowboard board core
Jiřík, Adam ; Borůvka, Vlastimil (advisor) ; Gašparík, Miroslav (referee)
Snowboarding as one of the fastest developing sports nowadays forces
manufacturers to improve equipment for this sport or to introduce other innovations
that would enhance pleasure of the ride. The most important and expensive part of the
equipment is the snowboard itself. So far, the high-quality snowboards with the best
ride properties include wood core. Every year a competition called Good Wood is
organized for the best snowboard models of the season.
This thesis deals with design and assessment of the new innovative composition
of snowboard cores using different combinations of wood and other structural solutions.
These compositions were compared with an already time-proven composition currently
used by Hackboards Ltd. company. By using the stress simulation with the finite
element method in SolidWorks Simulation program the stress progress and the
deflection size of designed cores and the reference core were found out. Part of this
thesis was also determining some of the physical and mechanical properties of native
wood types according to relevant norms. Measured values were used to verify
possibilities of using data of appropriate wood type from literatur efor simulation.
Designed composition of the wood core formed by battenboard combining by
poplar and beech reached very similar values as the reference composition formed by
battenboard made of poplar and ash. The composition of combined laminated poplar
and beech veneers showed a little worse properties. The composition formed by beech
battenboard and the composition of laminated beech veneers showed worse properties
in comparison with the reference composition.
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Testing methods of mechanical stress of standing trees (Picea abies)
Gregor, Martin ; Lukášová, Karolína (advisor) ; Holuša, Jaroslav (referee)
The diploma thesis was focused on the methods of mechanical stress of standing trees of Norway spruce (Picea abies) and finding out the insufficiency associated with this method to facilitate the work for next measurements in the subsequent years. There were found wind damages that occurred in the last 15 years. Damages were determined from reports of state of forestry management and from reports of agency forest protection. The method was tested in two locations (in Kostelec and in Bělčice). During testing was wire rope changed for fabric rope, which has better qualities and it is safer. Round slings were placed near to the centre of tree crown, then was tied fabric rope, strain gauge with data logger and hook from the winch rope. The winch was secured by round sling to the anchoring tree. Overall there were tested 10 trees, the applied load was from 320 to 1,060 kg. In the case, when the tree become broken, there was noted the height of the break point.
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