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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Determination of principal material directions in tissues of aortic wall
 Bogdan, Miloš ; Fedorova, Svitlana (referee) ; Burša, Jiří (advisor)
Main goal of this thesis is to find a way how to determine principal material directions in the tissues of aortic wall at large strains. A method is designed for this purpose on the basis of same principles as the method of detemination of principal strains and their directions using rosette gauges. These principles are consequences of tensor properties. In this work the method is applied for a stiffness tensor instead of strain tensor. An algorithm that calculates with this new method is also made and the required experiments are realised on three samples of porcine aorta. Principal material directions and deviations of the values are calculated for both small and large strains.
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Adhesion Strength and Fracture Morphology between FRC Root Canal Post and Particulate Filled Composite Core
 Kročová, Blanka ; Pavelka,, Vladimír (referee) ; Poláček, Petr (advisor)
This bachelor thesis examines the influence of composition and structure of the dental pin on its mechanical properties. It deals with the adhesion strength and fracture morphology of adhesive joints between composite, fiber stiffened root pin (FRC) and a core of particle composite. There is observed adhesive strength dependence on the diameter of the pin FRC, the fiber content of the pin and the use of the composite particle in which the pin is embedded. Shear, adhesive joint strength was measured using a universal testing instrument with specially-made jaws. Fracture morphology was analyzed by the scanning electron microscope (SEM). Obtained data shows that the shear strength of adhesive joints for the used materials is most affected by the quality of wetting the surface of the FRC. Effect on the results could be stress distribution in adhesive strength measurements because the used jaws were not in an ideal proportion for all diameters of the samples. In another part of thesis the samples of dental pins were tested in three point bending. For the study of fracture analysis, selected samples were tested by impact in bending and test was captured with high-speed camera. With the dental pin composed of more FRC posts with a smaller diameter at the same time there is not so extensive the quarry, as in the case of using the post with a large diameter. Character of a fracture in a compound dental pin is also influenced by the type of connecting material and quality of adhesion between the material and individual posts.
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National Repository of Grey Literature : 12 records found   previous11 - 12  jump to record:
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