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Hodnocení změny mechanických vlastností svařenců po tepelném zpracování
Tymová, Jana
The thesis deals with the evaluation of the change of mechanical properties of weldments after heat treatment and the influence of heat treatment on the mechanical properties of the material. The work is focused on characterization of methods in welding technology. First part of the work describes an individual types of welding. Welding is divided into melt and pressure, which is further subdivided into other types of welding. Some of the selected types of welding are described more specifically. The experimental measurement is described in the practical part of the thesis. The mechanical properties of heat-affected and influenced samples are compared. Experimental measurements consisted of a hardness test and a tensile test. Measurements are complemented by graphs from the 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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