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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Analýza deformace kruhového otvoru při roztlačování čelistmi nového NDT zařízení
 Kundera, Hynek
The issue of the thesis fall under the department of non destructive testing of wood. The thesis description is an experiment, which includes the measurement by application of a new semi destructive device on wooden beams commonly used in historical constructions in the Czech Republic. This measurement was monitored by DIC technology at the same time. The part of the results of work is also the treatise about the influence of different factors like the wood density, moisture content and others. This final thesis also discusses about the accuracy and appropriateness the measurement by a new diagnostic device for in-situ determination of strength and modulus of deformability in compression of wood parallel to fibers.
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Vliv vlhkosti na rychlost šíření zvuku dřevem
 Kundera, Hynek
This thesis is focused on the experimental determination of the influence of moisture content on selected acoustic properties of wood. The measurement was performed using two methods and tested were specially orthotropic specimens made from spruce, oak and beech. In addition to the influence of moisture content of wood on sound velocity in longitudinal direction were derived parameters as dynamic modulus of elasticity, acoustic constant and acoustic wave resistance. Another objective was to determine the influence of density on sound velocity of wood in longitudinal direction. Specimens were tested at five degrees of humidity for verification hers influences on acoustic parameters. The thesis also discusses the accuracy and appropriateness of the chosen experimental measurements using methods that were compared each other.
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